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1. 4 22 4 4 General Signal 0221000 4 23 4 5 Connector Panel 4 29 4 6 Back Banel Layout GY GU 4 30 5 0 DETAILED DESCRIPTION OF MODULES 5 1 5 1 Power Entry Module Isolation Transformer and Power Supply Board 5 1 5 2 FUSE BOA EN 5 3 6 0 CIRCUIT DIAGRAMS AND COMPONENT LISTS 6 1 6 1 Power Supply Board 100 6 2 6 2 Fuse Board RF101Du u wi GG sees cere ne 6 5 6 3 Impedance Board RF 1020 6 8 6 4 Stimulate Board RF103D Sub Board 6 13 6 5 RF Amplifier Board RF 104 etn tese Gor Mente atin 6 19 6 6 RF Voltage and Current Metering Board RF 105 6 24 6 7 Temperature Board RF106 410 4 000013 00 000000 6 29 6 8 Interlock Board RF107D 6 35 6 9 Connection Board eee 6 41 6 10 Interface Board RF110D AN 6 44 6 11 Computer Mother Board 111 0 0 0000000000000 eran 6 47 Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 1 1 L
2. ah ai zi E PI gee j if 1 LS Ju i qe DOE 4 T HL Ta aud lp ERI a MR L 5 l bhs Eel deb h al 8 8685 35 4 3 3 8 3 x i 4 3 5 ZEN amp RH 55 Figure 5 4 Stimulate Board Circuit Diagram Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 Figure 5 5 Morgan Automation Ltd 19 240 TR3 IRFP24C RF Amplifier Board Circuit Diagram ov ov sav 4 June 2006 5 8 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 SOMVOE M3LITT4NV FENI VEN 01 Cosi 5Ss30x3 MD ONVC IN iB 00329NVC3cWI 3 anys Gavot INVASA 01 1334402 00 0 8 0 viv Vi 0 21 0 OWD ANG 44 1181N09510 20i BVOY 1531 123 02510 OH gt 01 AN mmt x lt TAS l 4255 visa T 438 sisa 21357104 b NDS Wid pp n yr 4 Am a ma VA CY RO o 1 gt 1 90818 1 1 1 1 vien ge A TUYO decl I NET 22 1068 35 Yd 38 14 wani A 3 8152 sic c i CUNJNO RD WA Si 44 o vae TUYNI 4 0500 dev Di 09 574 CHVOE 3503 08 AC uza ORIOL AD NO 2200 0 D 9 953v 18601 E
3. 284 iT PN Figure 6 7 Stimulate Board RF 103 D Circuit Diagram June 2006 Morgan Automation Ltd 6 18 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT 1100 LOE TH 0 d N33H2S 1IS 020144 ALVINNILS O17 NOILVWOALOY NYSHON SO il vc gccvz ANNI ON 5 Figure 6 8 Stimulates Board RF103 D Component Layout June 2006 Morgan Automation Ltd Neurotherm Radio Frequency Lesion Generator Service Manual 6 5 RF Amplifier Board RF 104 C COMPONENTS RI 3K3 R2 3K6 R3 10K R4 1M R5 12K R6 120K R7 1K5 R8 820R R9 IK R10 100R R11 100R R12 4R7 R13 4R7 R14 1R R15 1R R19 10K R20 100R R21 OR39 R22 120K R23 10K R24 3K3 R25 12K R26 15K R27 10K R29 10K R30 1K8 R31 560K R32 330K RVI 10K Morgan Automation Ltd 5 5 5 5 1 1 5 5 5 5 5 5 5 5 5 5 5 5 1 5 5 1 5 5 5 5 5 5 Model 1100 0 66w 0 66w 0 25w 0 25w 0 25w 0 25w 0 25w 0 25w 0 66w 0 25w 0 25w 0 25w 0 25w 1 watt 1 watt 0 66w 0 25w 2 5w 0 25w 0 25w 1watt 0 25w 0 25w 0 25w 0 25w 0 25w 0 25w 0 25w 18 tum potentimeter Carbon Film Carbon Film Carbon Film Carbon Film Metal Film Metal Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film 6 19 Power Oxide Resistor Power Oxide Resistor
4. Ribbon Connectors and PSU Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 54 Model NT1100 DIA1 DIC1 DID1 o o o E gt s O O O 2 a o g gt gt gt YYYYYY eso 2 8 2 g 2 8 vorre O o o o gt gt gt 2 9 485885885 Belg 8 85885885 go B 985885885 golf E 2 85883855 85883585 85883885 SBBEBEER 9 SERBER 9 SERBERE 8 ARRAY 2 2 Y 88888888 5 S 5 8 z z rg 8 88 8 xs 2 ws 8 52 oe 58 55 T i Figure 6 24 Computer Motherboard RF111B Circuit Diagram Digital Inputs Morgan Automation Ltd June 2006 6 55 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 id o X s anov 5 JIYA 108 108 108 108 108 108 RA ozu sai vaa zai Gani 159 90 veo ees zeo 0 Hnoxnw Zw 108 Lr Uy uv Los V V v eM pj ten 03 asoro erdnooeg 8 1cio0v sw Sg Dyg 52 1000 x 125 192 5 AQ ien uot 829 422 not TEN OF 98013 81410220 S uas 22 138 20 2 1noq oav nog 2c 20v 20 215 JAY 099 g dO 99 ON
5. 35404 34 cwo TWYN 3 3 CS M 44 09 3503 MOM AC9 1 Tews NOG NR AO VOA SONOS 01 NOVA 69 122002 ADD 0 A8 0 OWA LWA 34 O VI D A91 0 1NGNNOO 38 HVD MILA TAN TAISA 510 it Diagram Figure 6 11 Board RF 105C C June 2006 Morgan Automation Ltd 6 28 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT 1100 253115 290149 GMHVOB I A cECVZ 017 NOTLVWOLNY NVSYON 0722 ANNI i 8 xs amm gs L Lone T F beo azsa 7 gi cm g tai dcm o eis3 visu 1993 HER S C La T Ee m TE Lu Gr seso dr un O F szsu LU isa D eiso 8880 ias 4 L 3 a WO as o O 25 Pme ELER EQSul V SH gesn Zsu aas DM O sa QHvOS I A FE 2189 9 93 13 cas Figure 6 12 Board RF 105C Component Layout June 2006 Morgan Automation Ltd Neurotherm Radio Frequency Lesion Generator Service Manual 6 29 Model NT1100 6 7 Temperature Board RF106 D Components R601 2K2 5 0 25 w Carbon Film R602 LINK R603 Not Fitted R604 2K2 5 0 25 w Carbon Film R605 2K2 5 0 25 w Carbon Film R606 2K2 5 0 25 w Carbon Film R607 2K2 5 0 25 w Carbon Film R608 43K 1 0 25 w Metal Fil
6. 5 5 5 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 5 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 0 25 watt Carbon Film 6 35 June 2006 Model NT 1100 Interlock Board RF107D contd R701 R702 R703 R704 R706 R707 R709 R710 R711 R712 R713 R714 R715 C716 C717 C718 C719 C720 C721 C722 C723 C724 C725 C726 C727 C728 D701 D702 D703 D704 D705 D706 D707 D708 D709 D710 D711 D712 D713 D714 D715 D716 D717 Morgan Automation Ltd 100nF 100nF 100nF 10MF 100nF 100nF 100nF 100nF 100nF 100nF 22nF 10nF 220MF
7. wo paras 282 SO Nd Dida 153735 9 wols3 pm d ircuit Diagram Interlock Board C Figure 5 8 June 2006 Morgan Automation Ltd 6 0 This section contains details of circuit boards and general wiring a b c Neurotherm Radio Frequency Lesion Generator Service Manual Model NT 1100 CIRCUIT DIAGRAMS AND COMPONENT LISTS Component Lists Circuits Board Layouts Details are included for the following Boards a b 9 f 9 h Power Supply Board Fuse Board Impedance Board Stimulate Board RF Generator Board RF Voltage and Current Board Temperature Board Interlock Board Interface Board Front Panel and Connection Computer Motherboard Morgan Automation Ltd RF100C RF101D RF102D RF103D RF104C RF105D RF106D RF107D RF110C RF109B RF111B 6 1 June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT 1100 6 1 Power Supply Board RF100C Components R1 4 7 5 1 4 watt R2 4 7 5 1 4 watt C1 3300MF 160v C2 4700MF 63v C3 4700MF 25v C4 4700MF 25v C6 470nF 100v C7 470nF 100v C8 470nF 100v C9 470nF 100v C11 470nF 63v C12 470nf 63v C13 100nF 63v C14 470nF 63v C15 470nF 63v C16 100nF 63v C17 470MF 16v RECI 6 amp Rectifier Bridge REC2 6 amp Rectifier Bridge REC3 6 amp Rectifier Bridge 4 6 amp Rectifier Bridge REG 78512 2 amp REG 7912 amp CONI 8 w
8. Because the generator is only delivering full pulses in this mode initially one sets the number of pulses that is desired for the procedure as opposed to procedure time since procedure time can vary depending on whether the set temperature limit was reached The following diagrams depict the different modes Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 18 Model NT1100 Figure 4 10 Shows Historical Pulsed RF amplitude control Pulsed RF output Ideal Z4 pulse width Ideal pulse voltage asl FET 88 28 20 aol LLL pete 42 0 m 21111111 1111 1 Temperature LLI limit EI 1 1 88 58 28 iii CETT GES Sa z ZE ES Es m S Em E V Lu 0 0 0 5 1 0 1 5 2 0 2 5 3 0 Figure 4 10 Pulse RF Amplitude Control The beginning pulses are the desired pulses of 45 volts amplitude and 20 ms duration Note that the moment the set temperature limit is reached the voltage is changed reduced in order to keep the temperature below this limit Note that this implies that every patient gets unpredictable and variable pulse amplitude which is undesirable Morgan Automation Ltd June 2006 Neurotherm Radio Fre
9. NIENAC3WIL ANAO NI amp dn123 135 1850 ND IW o ea Wal 19 014 vara did 2011 8010 HOMSNDNILS 24210 NOLNOWILS co m cr cq cal 2 N lt nial dd dain a d aoc lt lt lt lt NOV NY NV NOV 5 INVdW3L NY NOV 9 INVdW q lt June 2006 ircuit Diagram 000000000000000000000 Figure 6 19 Interface Board RF110D C uooooooooooooooooo o Morgan Automation Ltd Neurotherm Radio Frequency Lesion Generator Service Manual 6 46 Model 1100 SER No J3 J2 MORGAN AUTOMATION LTD INTERFACE BOARD RF110D SILKSCREEN INTERFACE BOARD RF1160D TP4 CLAMP se CMNE 22 11 05 24229 Figure 6 20 Interface Board RF110D Component Layout Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT 1100 6 11 Computer Mother Board RF111B Components R1 LINK R2 4K7 5 R3 LINK R4 LINK R5 LINK R6 30K 31 R7 30K 1 R8 NOT FITTED R9 NOT FITTED R10 NOT FITTED R11 10K 31 R12 10K 1 R13 1K 1 R14 LINK R15 NOT FITTED R16 1K 1 R17 1K 1 R18 1K 1 R19 1K 1 R20 1K 1 R21 1K 1 R22 NOT FITTED R23 NOT FITTED R24 10K 1 R25 10K 1 R26 10K 1 R27 10K 1 R28 4K7 5 RA1 4K7 RA2 4K7 RA3 4K7 RA4 4K7 RA5 4K7 RV1 10k Morgan Automation Ltd 0 25watt Carbon Film 0 25watt Metal Film 0 25watt Metal Film 0 25wa
10. Neurotherm Radio Frequency Lesion Generator Service Manual 4 7 Model NT1100 Earth Leakage Enclosure leakage current Normal 40 microamsps 100 microamps Reverse 40 microamsps 100 microamps Single fault condition Normal 40 microamsps 500 microamps Reverse 40 microamps 500 microamps Patient leakage current Normal AC 5 microamps 100 microamps Reverse AC 4 microamps 100 microamps Single fault condition Normal AC 7 microamps 500 microamps Reverse AC 7 microamps 500 microamps Patient Leakage current Normal DC 4 microamps 10 microamps Reverse DC 4 microamps 10 microamps Single fault condition Normal DC 4 microamps 50 microamps Reverse DC 4 microamps 50 microamps Patient Auxiliary Leakage Current Normal AC 4 microamps 100 microamps Reverse AC 4 microamps 100 microamps Single Fault Condition Normal AC 6 microamps 500 microamps Reverse AC 6 microamps 500 microamps Patient Auxiliary Leakage Current Normal DC 4 microamps 10 microamps Reverse DC 4 microamps 10 microamps Single Fault Condition Normal DC 4 microamps 50 microamps Reverse DC 4 microamps 50 microamps Patient Leakage Floating Type Normal 27 microamps 5000 microamps Reverse 27 microamps 5000 microamps Single Fault Condition Normal 36 microamps 5000 microamps Reverse 35 microamps 5000 microamps June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual Environmental Conditions Model NT 1100 4 8 7 Transp
11. Should the power cord or plug become cracked frayed broken of otherwise damaged it must be replaced immediately If the equipment has in any way suffered mechanical damage it should be returned to the Supplier for Inspection and Test before further use Unplug the power cord before cleaning or service The operator should not perform any servicing of the equipment Any servicing should only be carried out by qualified personnel EXPLOSION HAZARD Equipment not suitable for use in the presence of a flammable anaesthetic mixture with air or with oxygen or nitrous oxide ELECTRIC SHOCK HAZARD Always turn the equipment off before cleaning and DO NOT allow ANY fluid to enter the ventilation holes or sockets ELECTRIC SHOCK HAZARD Do not touch any exposed wiring or conductive surface while cover is off and the equipment is energised The voltage present when the electric power is connected to the equipment can cause injury or death Never wear a grounding wrist strap when working on energised equipment FUSE REPLACEMENT For continued protection against fire hazard replace only with same type and rating of fuse as displayed on the rear Serial Number Plate IMPROPER LINE VOLTAGE The voltage selector on the mains input socket is factory set and should not be changed by the user The serial number plate shows the correct mains input voltage for the machine and the rating of the fuses to be used in the mains input fuse holder An incorrec
12. 120 Toroid L504 1 120 Toroid D501 4148 0502 4148 Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 26 Model NT 1100 RF Voltage and Current Metering Board RF 105C contd D503 D504 D505 D506 D507 D508 D509 D511 D512 D513 D514 D515 TR501 TR502 TR503 U501 U502 U503 U504 U505 U506 U507 U508 RL 501 RL 502 RL 503 RL 504 RL 505 RL 506 TP1 8 Connector Handle Black Morgan Automation Ltd 4148 4148 4148 4148 4148 Red LED Green LED IN 4148 Green LED IN4148 Amber LED Red LED BC337 NPN Transistor MPSA 13 Darlington BC337 NPN Transistor CA 3096E NPN PNP Transistor Arrays CA 3096E NPN PNP Transistor Arrays LF 398 Sample and Hold LF398 Sample and Hold 4011 Quad 2 Input NAND Gate 4093 Quad 2 Input NAND Schmitt Trigger 4041 Quad TRUE COMPLEMENT Buffer 4538 Dual Precision Monostable Multivibrator Single Pole Reed Relay 12v Single Pole Reed Relay 12v Double Pole Reed Relay 12v Double Pole Reed Relay 12v Single Pole Relay 12v Double Pole Relay 12v Test Points DIN 41612 Type D 32way ac June 2006 6 27 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 LEG 1258 9160 T 438 ja 5150 gysTnd 828 792514 04251040 227 4 NOS YA 920 SCNVDS B3LII3dwV 38CIVHGUNGI 01 Wai 553203 ya ISNA 38 381 08708 NOUS
13. 5 5 5 5 5 5 5 5 5 5 5 5 Model NT1100 1watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film 6 24 June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 25 Model NT1100 RF Voltage and Current Metering Board RF 105C contd P501 1K 18tum Potentiometer P502 1K 18tum Potentiometer C501 10nF 100v Polyester C502 10nF 100v Polyester C503 33nF 100v Polyester C504 100nF 63v Polyester C505 100nF 63v Polyester C506 470nF 63v Polyester C507 33nF 100v Polyester C508 100nF 63v Polyester C509 100nF 63v Polyester C510 470nF 63v Polyester C511 100nF 63v Polyester C512 100nF 63v Polyester C513 100nF 63v Polyester C514 100nF 63v Polyester C515 100nF 63v Polyester C516 100nF 63v Polyester C517 100nF 63v Polyester C518 100nF 63v Polyester C519 100nF 63v Polyester L501 Inductor 470 uH L502 Inductor 470 uH L503 120
14. HILL 25075 131 185 35 NIESN3SWIIS NI amp SSLWWILS 0374182010 3 INL8 4435 104 18 301 01 9 NIgI1a8VISDOLOV NISNAGdH3L NISNAG3NIL N18NDISS3SGN3 N18NA013313S NI amp dnL2313S NL amp dNdW3l dIMLOdWILS HOMSWIIS dIMLOd 3a 6 8 L 9 S v e I dwWv 129 1553 22653 91553 20653 26253 28223 29223 29123 26153 29153 2eNId Ir 9 2ET23 22123 2123 90133 3633 2823 2453 2953 86123 88123 8 123 89123 98223 99223 99123 8821 86123 ar13 90623 96223 Vv23 96123 VETO3 VvT23 92123 923 9953 9623 90123 9621 9823 9423 1 1 03 14182010 1 9 1 934335104 0 09343351 WaIM3S 109 NUS 70444 9510 8 S8dND2 9510 28 3 09 0 AS WILS 135 ILSN ONILS V03el JSN3S 1703435435 0 034 5 5 IVLIG 36223 2v223 26253 32223 31223 86223 88223 84223 86223 8v223 8453 52253 Vv223 VE223 42193 42193 82E23 T2NIdIC VIE23 02NIdIC 6INIdIC TINIdIC BINIdIC LINIdIC EENIdIC vENIdIC SeNIdIP 34223 NOV 80653 NOV 89223 2 INDV 26123 NOV 28123 24123 4 9 g81123 H0123 0 99 8623 98153 NOV 6123 NOG V JdWV 14915 du 04 04 NU SI A0 03sn4 WasH S dfldW
15. Metal Film Metal Film vitreous Metal Film Carbon Film Carbon Film Carbon Film Carbon Film June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 5K1 5 AK7 5 10K 5 10K 5 3K3 5 10K 5 2K 5 100R 5 75K 5 1K 5 680R 5 12K 5 12K 5 470 5 330R 5 10K 5 150R 5 4 7 5 10K 31 8K2 41 1K 1 2K 1 6K2 41 100R 1 9K1 41 1 5 100nF 100nF 100nF 100nF 100nF 100nF Select on Test 100nF NOT FITTED 47pF 2 2nF 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film 18 Turn Potentiometer 18 Turn Potentiometer 18 Turn Potentiometer 18 Turn Potentiometer 18 Turn Potentiometer 18 Turn Potentiometer 63v 63v 63v 63v 63v 63v 63v 63v 63v 63v 63v 63v 63v 100v 100v Stimulate Board RF103D 4 Sub Board contd Morgan Automation Ltd Polyester Polyester Polyester Polyester Polyester Metallised Polyes
16. 100nF 100nF 100MF 100nF 470nF 10MF 10MF 220MF 100nF 100nF 10nF 10nF 100nF LED Amber LED Red INA148 LED Green LED Red LED Red LED Red INA148 INA148 INA148 INA148 INA148 LED Red LED Red INA148 LED Red INA148 63v 63v 63v 35v 63v 63v 63v 63v 63v 63v 100v 100v 16v 63v 63v 16v 63v 63v 35v 35v 16v 63v 63v 100v 100v 63v Neurotherm Radio Frequency Lesion Generator Service Manual Polyester Polyester Polyester Electrolytic Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Electrolytic Polyester Polyester Electrolytic Polyester Polyester Electrolytic Electrolytic Electrolytic Polyester Polyester Polyester Polyester Polyester 6 36 June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 37 Model NT1100 Interlock Board RF107D contd 701 ZVN4206A Small Signal MOS TR702 BC337 NPN Transistor TR703 BC337 NPN Transistor TR704 BC337 NPN Transistor U701 4012 Dual 4 input NAND Gate U702 4001 Quad 2 input NOR Gate U703 4011 Quad 2 input NAND Gate U704 4011 Quad 2 input NAND Gate U705 TLO71 Amplifier U706 NE 555 N Timer 0707 556 Dual Timer U708 4049 Hex Inverting Buffers RL701 Double Pole Relay 12v RL702 Double Pole Relay 12v RL703 Double Pole Relay 12v RL704 Double Pole Relay 12v RL705 Double Pole Relay 12v RL706 Double Pole Relay 12v RL707 Double Pole Relay 12v TP1 5 Test Points Con
17. 2 7 68 3K24 28K 442R 16K2 2K7 14K 133R 9K1 274R 7K5 287R 6K8 191R 9K1 18K 45K3 91K 9K1 18K 45K3 91K 10K 10K 1K 2K4 4 7 1K5 1K5 18K 10K 10K 39K 22R 33K 470R 1M 4 7 27R LINK 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 5 5 1 1 5 5 5 1 1 1 1 5 1 5 5 5 5 Model 1100 7 0 6 watt 0 6 watt 0 25 watt 0 25 watt 0 6 watt 0 25 watt 0 25 watt 0 6 watt 0 6 watt 0 6 watt 0 6 watt 0 25 watt 0 6 watt 0 6 watt 0 25 watt 0 6 watt 0 25 watt 0 6 watt 0 25 watt 0 6 watt 0 25 watt 0 25 watt 0 6 watt 0 25 watt 0 25 watt 0 25 watt 0 6 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 2 5 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt 0 25 watt Stimulate Board RF103D 4 Sub Board contd Morgan Automation Ltd 6 13 Bussed Resistors SIL Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Metal Film Carbon Film Carbon Film Metal Film Metal Film Carbon Film Carbon Film Carbon Film Metal Film Metal Film
18. 6 16 Interlock Board RF107D Component Layout Morgan Automation Ltd Neurotherm Radio Frequency Lesion Generator Service Manual 6 41 Model NT1100 6 9 Connection Board RF109B Components R901 3K3 5 0 25watt Carbon Film R902 3K3 5 0 25watt Carbon Film R903 3K3 5 0 25watt Carbon Film R904 3K3 5 0 25watt Carbon Film R905 3K3 5 0 25watt Carbon Film R906 10K 5 0 25watt Carbon Film R907 1K 5 0 25watt Carbon Film R908 330R 5 0 25watt Carbon Film TR901 BC327 PNP Transistor 901 Sounder CON901 11 way Single Row Header CON901 10 way Single Row Header CON901 10 way Header CON901 34 way Boxed Header Morgan Automation Ltd June 2006 6 42 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 ii ER HOLIASNO 43 10934 a 1UdWILS 037318 44357104 Q3 INISNDIIS 1 I i I I i i I 1 1 1 I I I i I I 2 2 2 Q se EXE 2064 9 EXE 1064 T NIESN3SWILS z e NIENDISS3SGN3 N185D1 NI8NAG13313S NIi8 amp dn12313s dqav gd 805 13NVd INONI 38V2 ND amp G amp I 960144 VE NDI L 3NNDO C o lt 10d 119110 33 104 104100 WILS 015371 d 50108 lt lt AWOSN3S NOIS31 3NVd LNU2 3 NADG NOISS3S NAOG 123135 ircuit Diagram 6 17 Connection Board RF109B C Figure June 2006 Morgan Automation Ltd Neurotherm Radio
19. 82 z ec 297 i zt hi gt wor l 9r 298 gora a r M so 901924 091 caria 9908 31 w j5 Lordy vog X 07831 NI i qTyvog yA June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual Figure 6 28 Front Panel Wiring Figure Morgan Automation Ltd Neurotherm Radio Frequency Lesion Generator Service Manual 6 59 Model NT1100 6 29 General System Schematic Morgan Automation Ltd June 2006
20. Carbon Film Carbon Film Power Oxide Resistor Metal Film Carbon Film Power Oxide Resister Metal Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 20 Model NT1100 RF Amplifier Board RF 104 C contd C2 100nF 100v Polyester C3 100nF 100v Polyester C4 100nF 100v Polyester C5 100nF 100v Polyester C6 220nF 100v Polyester C8 417 375v Polypropylene C9 820pF 250v Silver Mica C10 10nF 375v AC Polypropylene C11 10nF 375v AC Polypropylene C12 100nF 250v AC Polypropylene C13 100nF 250v AC Polypropylene C14 22nF 375v AC Polypropylene C15 10nF 100v Polyester C16 10nF 100v Polyester C17 100nF 100v Polyester L1 4 4 9 On Former L2 47uH L3 47 uH D1 BAV 21 Fast High Voltage Diode D2 BAV 21 Fast High Voltage Diode D3 IN4148 D4 IN4148 D5 IN4148 D6 IN4148 D7 IN4148 08 134148 9 79 C10 10v Zener Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 21 Model NT1100 RF Amplifier Board RF 104 C contd TR1 2N 5550 NPNTransistor TR2 IRFP 240 Power MOSFET TR3 IRFP 240 Power MOSFET 4 BC182L NPN Transistor TR5 2N5550 NPN Transistor TR6 IRFP240 Power MOSFET TR7 IRFP 240 Power MOSFET U1 LM741 CN Operational Amplifier U2 4N32 Darlington Opto Isolator U3 TC4427CPA Dual Mosfet Driver SENS 1 T75 Thermal Switch 75 RL1 2pole 12 Volt Relay RL2 2pole 12 Volt
21. a series of relays which select which output should be activated In order for the safety relay to operate the following conditions have to be met a A lesion must have started and not be timed out b The Temperature Board must not have detected a temperature in excess of 95 C The Computer Watchdog Timer must be running d Pulse or Lesion Mode must have been selected e If Auto Start has been selected RF Control is turned off fully anticlockwise f Auto Stop has not been pressed If all the conditions for the safety relay are met the RF signal is switched to 3 relays which control which outputs of the machine receives an RF signal This is under the control of the computer as when multiple outputs are used the RF is switched to each output in turn When operating with Dual Probes and a lesion is made between two electrodes one of the outputs of the machine is switched to act as the dispersive Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 28 Model NT1100 When a procedure is completed an alarm tone is sounded The volume of this alarm can be set up on the Options Screen of the machine and the computer generates the appropriate Analogue Output Signal to activate the required volume on the board Computer Board and Ancillary Boards The Computer Board is a PC104 Single Board Computer with a 5 watt requirement so forced air cooling of the computer is not required The board c
22. any of the 3 probe input sockets on the front of the machine as selected by the user Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 25 Model NT1100 A hardware interlock is fitted to prevent stimulate pulses being emitted when the stimulation mode is selected and the voltage current control is not initially set to zero This circuit is in addition to the software interlock The flashing LED on the appropriate stimulate mode select button operates when output is present this is controlled by software The output from the board is connected to an analogue input on the Computer Motherboard and displayed on the display screen Temperature Board RF106 The temperature Board measures the temperature at any selected output and controls the power sent to a probe by switching it off when a selected temperature is reached The input to the board is from the three probe sockets on the front panel of the machine The board contains a single temperature measuring circuit and which probe is connected to it is controlled by the computer In procedures where multiple probes are connected to the machine the single temperature circuit is switched between probes The temperature circuit is designed for Type K Thermocouples and the small signal from the selected probe is passed via a multi stage low pass filter to a Monolithic Thermocouple Amplifier with Cold Junction Compensation This Thermocouple Amp
23. based medicine pulsed radiofrequency has not yet been validated Several retrospective studies and audits have been conducted and the initial results are positive Because of a lack of uniform treatment guidelines the anecdotal results for pulsed have ranged from magnificent to abysmal It is this author s belief that standardization of many of the PRF parameters will at worst result in uniform treatment for all patients and at best significantly improve the clinical outcomes In any case controlled clinical studies are long overdue for this potentially promising modality When the study of PRF began the parameters were arbitrary For the voltage a value is taken that was within the range of the voltage during the initial heating phase of an RF heat lesion The values of 20 milliseconds on time and 480 milliseconds off time were chosen because they were thought to provide good conditions for preventing heating above 42 degrees Centigrade The initial choice of 120 second duration of the procedure was completely arbitrary and it was just taken as a starting point With no scientific basis these parameters have been arbitrarily modified by clinicians and thus there is no consensus as to what the optimum parameters are One of the major variables in pulsed radiofrequency treatment is the voltage level when the pulses are on This arises from the desire to keep the temperature below 42 degrees C If 42 degrees C is reached it is necessary to eithe
24. computer motherboard by 2 x 50 way ribbon cables and to the Connection Board and front panel keyboard by a 34 way ribbon cable Connection Board RF109 and Front Panel Keyboard The Front Panel Keyboard consists of 14 Membrane Keys with tactile feel 4 of which have an integral LED There is also a single Mains LED The Panel also contains two rotary potentiometers with integral switches which indicate when the potentiometers are in the off position The Connection Board is located on the rear of the Front Panel Keyboard The connection to the Membrane Keyboard is via a 21 way flat film connector and the connection to the two potentiometers with integral switches is via a 10 way latched connector A 34 way ribbon connector connects the Connection Board to the Interface Board Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 24 Model NT1100 A small circuit and sounder are also mounted on the Connection Board to give the tick as time counts down Impedance Board RF 102 The Impedance Board measures impedance at the patient using a small 53 KHz signal Its input is connected to the Interlock Board and can be switched to measure the impedance at any of the 3 probe connectors The Board contains a 500 Ohm Test Resistor which is switched into circuit during the self test sequence of the computer to check that the Impedance Circuit is working correctly The Board also contains a tone circu
25. is connected by to as the active electrode another in contact with the surface of the body referred to causes current to flow through the wires through the electrodes and to the patient s body The patient s body is a conductive electrolytic media and thus the patient s body becomes part of the RF circuit This current spreads out from the electrodes and flows through the electrolytic tissue ar 4 EM 1 wires to 2 electrodes one as the dispersive electrode This is the so called monopolar medium of the body The active and dispersive electrodes have a similar physical role in delivering and receiving the current but functionally because of their differing areas they have inserted into the body referred ei Fundamental Radio Freauency circuit configuration The RF voltage very different effects with regard to the RF heating process The active electrode with its smaller surface area has much higher field densities in the tissue adjacent to it This higher field density causes significant heating near the active electrode surface The dispersive electrode has a much larger area and as a conseguence the field density is much lower in the tissue adjacent to it This results in a lower radiofreguency heating effect and thus if the dispersive electrode is large enough no appreciable heating will occur near it In fact a large area surface plate to join to the skin with a conductive gel for good conductivi
26. main cooling fan Morgan Automation Ltd June 2006 5 2 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 u pus AN pusupa wi ovn rug TIS 1 WSHA WOOHOO HOLIAS 3804 LOdNI YALTA TYOIGHN SYMIAU MINOOR WOOKOD AY WSIO ONY i wainawoo asie X04 VSTI June 2006 Morgan Automation Ltd Neurotherm Radio Frequency Lesion Generator Service Manual 5 3 Model NT1100 Figure 5 1 Power Supply Unit Circuit Diagram 5 2 Fuse Board Referring to Figure 5 2 DC voltages from the Power Supply Board go to the Fuse Board which provides fusing for the various supplies together with LED indication of the status of the each supply LED ON Supply Healthy and Test Points for monitoring and fault finding The fusing provided is F101 12 for logic fused 2 amps F102 12V for logic fused 1 amp F104 90V for RF Power fused 2 amps F105 15v for Computer supply 5v fused 2 amps F106 15v for Display Illumination fused 2 amps Test points provided are TP 1 12v TP2 Logic TP3 12v TP5 90v RF Power TP6 Ov TP7 15v Supplies to Computer TP8 Ov Motherboard TP9 15v The LED indication is LED 101 12v Logic LED 102 12v Logic LED 104 90v RF Power LED 105 15v Computer 5v LED 106 15v Display Illumination All supplies are connected on their se
27. temperature at large distances from the electrode tip By raising the radiofrequency voltage one will increase the temperature to T1 near the electrode tip and thus the distances to the 45 C isotherm will increase accordingly With knowledge of these characteristics and the temperature vs distance curve one can therefore judge the size of the lesion volumes by choosing the appropriate tip temperature for a given tip geometry This is the reason temperature measurement has been historically essential to produce consistent and quantified lesion volumes Measurement of the tip temperature has another very important benefit By avoiding tip temperatures near 100 C the temperature at which water boils one avoids the undesired effects of charring sticking or the formation of a hemorrhage or explosive gas which may be also be accompanied by sparking In the early days of neurosurgical lesions before reliable tip temperature measurement was possible neurosurgeons would establish the end point of their lesion making by listening for the popping lesion The popping was caused by the tip temperature exceeding 100 C and the subsequent gas formation at the tip to the electrode This obviously was not a controlled lesion technique and led to unpredictable and dangerous destructive conditions In pain management there are now well established prescriptions for appropriate electrode size and tip temperature to achieve desired lesion volumes It has been
28. 03A 8 oo 1 E 3 5 c 8 i 1 1 1 i 3 1 c Figure 6 13 Temperature Board RF106D Circuit Diagram Morgan Automation Ltd June 2006 6 34 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT 1100 43393553115 OHVOBG 3H0LVHZdW3L 0 2 2 aLI NOILVYWOLDVY NVSHOW 80 z 6 4883 8893 2193 9192 2 8 nm EE XD em aO ela eieo ji t LS 8298 Gweu Q Gitau azro Geray 090144 GHVOB 3HnivH3dA31 Figure 6 14 Temperature Board RF 106D Component Layout June 2006 Morgan Automation Ltd Neurotherm Radio Frequency Lesion Generator Service Manual 6 8 Interlock Board RF107D Components R701 R702 R703 R704 R705 R706 R707 R708 R709 R710 R711 R712 R713 R714 R715 R716 R717 R718 R720 R721 R722 R723 R724 R725 R726 R727 R728 R729 R730 R731 R732 R733 R734 R735 R736 R737 R738 R739 R740 R741 R742 R743 R744 R745 R746 Morgan Automation Ltd 10K 10K 22K 3K9 10R 510R 10K 10K 10K 330K 10K 10K 10K 10K 100K 10K 10K 10K 10K 100K 10K 10K 10K 10K 47K 4 7 10 4 7 10 100 100 10 10 10 10 4 7 4 7 4 7 4K7 4K7 4K7 4K7 4K7 4K7 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
29. 1 Thermistor 100K at 25 Type LS201 Loudspeaker 8ohm 40mm dia 200mW RL201 12V Low Power 2 pole relay RL202 12V Reed Relay RL203 12V Reed Relay RL204 12V Low Power 2 pole relay RL205 12V Low Power 2 pole relay RL206 12V Low Power 2 pole relay TP1 TP3 Test Points 64 Way Connector DINA16 Type D 32 way ac Handle White Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 11 Model NT1100 e x ac UNK IN PLUG FOR COROOTOMY CORDOTOMY PROBE CONNECTED H CORDPROBE Figure 6 5 Impedance Board RF102 D Circuit Diagram Morgan Automation Ltd June 2006 6 12 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 v 197 toZ s za N33H2S IS 028144 017 NOILYWOLOV NVSHOW 80711712 2123 vccvZ Figure 6 6 Impedance Board RF102 D Component Layout June 2006 Morgan Automation Ltd 6 4 Neurotherm Radio Frequency Lesion Generator Service Manual Stimulate Board RF103D 4 Sub Board R301A F R302A R302B R303A R303 B R304A R304B R305A R305B R306A R306B R307A R307B R308A R308B R309A R309B R310A R310B R311A R311B R312 R313 R314 R315 R316 R317 R318 R319 R320 R321 R323 R324 R325 R326 R327 R330 R331 R332 R335 R336 R337 R338 R339 R340 R341 R342 10K 698K 16K2 280K K6 140K
30. 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 51 Model NT1100 RDEN6n 7 RDEN5n 74HCT688 74HCT138 74HCT138 lt lt 4k7 RA1 SW DIP 8 2 E o c o o gt E 9 Q 74HCT240 E o _ 104_1 292248 222 52222252228509598995959 Figure 6 21 Computer Motherboard RF111B Circuit Diagram Bus Interface Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 52 Model NT1100 885888885 292209528 ADC SCLK ADC SELn r 4 4 WREN2n K BDR Y c gt z E Figure 6 22 Computer Motherboard RF111B Circuit Diagram Digital Outputs Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 53 Model NT1100 58 9939852 9 ooboeooooooooooobobobooboobooooooboo ovce O ASV V AGND 12v Testpoint wam 2 S 3 i 14 5 6 7 8 9 10 CON10 DGND Testpoint C15 10n INDUCTOR oR C14 10n C13 100n M3 HOLE NP M4 HOLE PL M4 HOI MTG11 U19 TRACO TEN 15 1211 IK220 1N4002 Tab is Gnd amp 2 2 8 5 5 Li 5 5 s 5 8 8 3 3 82 2 C44 470n 1 ew M4 HOLE PL 41 MTG7 41 M3 HOLE NP MTG9 e g M3 HOLE NP Figure 6 23 Computer Mother Board RF111B Circuit Diagram
31. 231 4 7 R232 200R R233 10K R234 33K R235 1K R236 10K R237 AKT R239 LINK R240 1K R241 39R R242 10K P201 1K P202 20K P203 5K Morgan Automation Ltd 5 5 5 5 5 5 0 5 0 5 5 0 5 5 5 5 5 5 5 5 5 5 5 5 5 5 0 1 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 Model 1100 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 1 Watt 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W 0 25 W Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Precision Metal Film Precision Metal Film Carbon Film Precision Metal Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Precision Metal Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Carbon Film Potentiometer 18 turn Potentiometer 18 turn Potentiometer 18 turn 6 8 June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 9 Model NT1100 Impedance Board RF 1020 contd P204 50K Potentiometer 18 t
32. 8 10 12 Frequency Hz Figure 4 8 Frequency Spectrum of a 2Hz Rectangular Pulse Figure 4 8 shows the frequency spectrum of a two Hz rectangular pulse As can be seen from the figure the major frequency component is at two Hz and falls off as the frequency increases At frequencies above 1000 Hz the amplitude of the frequency component is getting very small There is a very different situation with pulsed radiofrequency In this case the rectangular pulses have radiofrequency inside of them This changes the frequency spectrum entirely As can be seen from figure 4 9 the major frequency component is now 500 kHz and decreases at higher and lower frequencies At frequencies below 1000 Hz the contribution can be shown to be negligible In conclusion the frequency spectrums of pulsed radiofrequency are entirely different than the frequency spectrums of low frequency stimulators Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 16 Model NT1100 Strength 500 kHz frequency Hz Figure 4 9 Frequency Spectrum of a 500KHZ Signal There is very little conclusive research to date on the mode of action of PRF A few preliminary studies have shown that a modification of CFOS and DNA expression has been observed in cells of rat DRG after exposure to PRF However additional basic research needs to be done to come to any good scientific conclusion as to the mechanism of action of PRF In this era of evidence
33. Figure 6 25 Computer Motherboard RF111B Circuit Diagram Analog Inputs June 2006 Morgan Automation Ltd 6 56 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 vOv GNOV ANDY ON SSA SZ33HA saa H33HA QLNOA 21 0 T ONS 13554 so 1SN gt gt avo15va 199va vivaova en 092 not Ivan Ias Figure 6 26 Computer Motherboard RF111B Circuit Diagram Analog Ouputs June 2006 Morgan Automation Ltd Neurotherm Radio Frequency Lesion Generator Service Manual 6 57 Model 1100 i C 6 i EO i z ct T FOS 119 ABND 411414141414 1414 00000001 8 8 4 3 9 11414141 3 5 5 gt 2 2 2 2 2 2 el 5 z 22 z2 8 z 5 25 85 55 2s 53 3 5 8 z a a lt m u E cs s 85 z 5 5 8 855 z 2 o 20 e ca lt oo ao Figure 6 27 Computer Motherboard RF111B Computer Layout Morgan Automation Ltd June 2006 6 58 Model NT1100 lt 38053 2 39059 380Nd 7139795 1531 3 4519 lc i H O 9 1 gt 41366 8C gt
34. Frequency Lesion Generator Service Manual 6 43 Model NT1100 serra CONNECTION BOARD 1 RF109B CONSO 1 R904 4 R906 TR901 R901 R902 R907 R903 R905 11 12 5801 CON904 CONS982 R908 N CONS93 Figure 6 18 Connection Board RF109B Component Layout Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 44 Model NT1100 6 10 Interface Board RF110D Components J1 34 way Male PCB Boxed Header with short latches J2 50 way Male PCB Boxed Header with short latches J3 50 way Male PCB Boxed Header with short latches TP1 4 Test Points Edge Connector 96 way DIN41612 Handle White Morgan Automation Ltd June 2006 6 45 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 SENIdED LvNIdEC J N ENIdED 2 N TeNIder vENIdEC 9 26 533 vENIder VIE 23 O NI der 9eNIder SeNI der TENIder 90253 91253 4 92253 o 96233 SDIO3NNOO 3903 289123 80223 81223 62223 8v223 865223 28VI23 c lt coooooooooooooooooooooooooooooooo aoooooooooooooooooooooooooooooooo O dWwv 13 28 2 23 O gwm O NISNDIS31 N18 4835 104 3 INLINDIS3 1
35. NEUROTHERM RADIO FREQUENCY LESION GENERATOR MODEL NT 1100 Service Manual Neurotherm Radio Frequency Lesion Generator Service Manual Model 1100 1 0 CONTENTS 1 1 1 854213 3 2 0 WARNINGS AND CAUTIONS oa ecrit reu ree DE ov Ra Rd Eee de vod y aie 2 1 3 0 INTRODUCTION AND APPLICABILITY OF THIS 2400 3 1 3 1 Introduction and applicability of this 3 1 3 2 Summary of Equipment Revision 3 2 3 3 Summary or Board Revision Changes te 3 3 3 3 1 Revision A All Boards NT 1100 5 eo u pe e a m 3 3 3 3 2 Revision B Boards in rack 4 3 3 3 4 Manual Updates ini t RR SER HERR AYER D ER NER ERR ERR XU TRAMA dees 3 4 3 4 1 Neurotherm Radio Frequency Lesion Generator Unit Manual Changes 3 4 3 4 2 Record of Manual Updates carried 3 5 4 0 GENERAL DESCRIPTION AND PRINCIPLE OF LESIONING 4 1 4 1 oDpeciticationsu eu Ar 4 1 4 2 Principles of Cesigblll Ka 4 11 4 2 1 The basic physical principles of radiofrequency ablation 4 11 4 2 2 Pulsaed radioffequericy eed it p rodea 4 14 4 2 3 The Pulse Dose 4 17 4 3 General
36. Relay 1 15way Molex friction Lock Header CON2 SMB Straight Male PCB Header TP 1 Test Point Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 22 Model NT1100 LINK TR3 IRFP240 EHT Ename ov lev 13 4 e 5 Figure 6 9 RF Amplifier Board RF104 Circuit Diagram Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 23 Model 1100 L1 3 3 41 32 iL Jj D e T pr R18 15 R14 8 Ht Rm C17 n CON2 RI EE EF R3 L2 L3 gt RS c R3 o9 CON MORGAN AUTOMATION LTD RF AMPLIFIER SILKSCREEN A 1 8 05 RF AMPLIFIER BOARD RF184C RL RL2 SER vo CMNE Z4241 Figure 6 10 RF Amplifier Board RF104C Component Layout Morgan Automation Ltd June 2006 6 6 Neurotherm Radio Frequency Lesion Generator Service Manual RF Voltage and Current Metering Board RF 105C Components R501 R502 R503 R504 R505 R506 R507 R508 R509 R510 R511 R512 R513 R514 R515 R516 R517 R518 R519 R520 R521 R522 R523 R524 R525 R526 R527 R528 Morgan Automation Ltd 12K 1K1 2K7 11K IK1 2K7 11K 2K2 IK5 33K 22K 6K8 33K 22K 6K8 10K 10K 82K 100K 4 7 LINK 82K 82K 240K 10K 10K 4 7 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
37. S AddNS H3MOd oocvz 017 NOILVWOLDV NVSHOW S Z EL ANNI L ENOJ sa X 2 AZI 63 2 O 91J L ES a T TF AZ L v e GdL 33u e of e gt Q Ei liu tdl LE t 25 Edl 2534 BE o oa ae 112212 MIO 55 x 308 434 1939 H3MOd Figure 6 2 Power Supply Board RF100 C Component Layout June 2006 Morgan Automation Ltd Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 6 2 Fuse Board RF101D R101 AKT X596 0 25 watt Carbon Film R102 AKT X596 0 25 watt Carbon Film R104 27 5 0 25 watt Carbon Film R105 6K8 5 0 25 watt Carbon Film R106 6K8 5 0 25 watt Carbon Film R107 5 0 25 Carbon Film R108 8 2 5 0 25 watt Carbon Film R109 1 2 5 0 25 watt Carbon Film R110 1 2 5 0 25 watt Carbon Film R111 2 2 5 0 25 watt Carbon Film R112 2 2 5 0 25 watt Carbon Film R113 AKT X596 0 25 watt Carbon Film R114 10k 595 0 25 watt Carbon Film T101 BC337 NPN Transistor U101 4 way Transistor Output Opto Isolator Type KP1040E LED 101 LED 102 LED 104 Low power 5mm Board Indicators Green LED 105 LED 106 F 101 F 102 F 104 Open Fuse holders with Covers F 105 F 106 Test Points TP1 TP9 PCB Test Terminals Black Handle DIN 41612 Edge Connector Type D32 Way Morgan Automation Ltd 6 5 June 2006 6 6 Neurotherm Radio Frequency Lesion Generator Service Manual Mo
38. TU o 3ALL3V vez At gwae HOLT TWN WOX 2 15534511 it Diagram Figure 5 6 WI Board C June 2006 Morgan Automation Ltd 5 9 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 ead 5530 2 O 28 wg and ml va 550 1 38084 123NND2 2 38084 123NN02 38084 123NNUJ 33895 21 1 38034 521 21 38084 21 21 1 38UMd 21 Nel ACI 3r Figure 5 7 Temperature Board Circuit Diagram June 2006 Morgan Automation Ltd 5 10 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 Xe 1 Bed 2 AVL 4 08 20133151 3 se par 3 m Yor oo 9 t3 i AMT b p X aW ub 2226 sun 46 oie p 1 s giu t T 09 B S Jus morh t lav 8040 waz 9 2L gt eLa LI 112 8 I s 1 512 LES 29 HO O A 24 6 55 e 7 H LIV me any O 221 soc no DS mwa waviv O M 2452 10157 206 ne 28 3 Lu Dix WA 2 Cs 90 0 eus 524 vald 4145 ae 1 vol Ly 6 mns O a nosar vat 218771 lt
39. adiofrequency at high intensity without allowing the tip temperature to rise to neurodestructive levels The method that was chosen by Sluijter was placing the output setting of the RF generator in the same range as was customary for making heat lesions but interrupting the output thus allowing for sufficient time for the generated heat to be washed away by thermoconductivity and circulation This method has been commonly referred to as pulsed radiofrequency PRF Pulsed radiofrequency is a relatively new technique that applies short pulses of radiofrequency 20 ms at a high voltage of 45 to 60 volts to neural tissue Figure 4 7 shows the currently accepted paradigm of 20 milliseconds of RF followed by 480 milliseconds of off time In this way high intensity radiofrequency is delivered but with a short enough on time so as not to cause heating above 42 C Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 15 Model NT1100 V VOLTS 40 30 20 10 20 30 40 20 ms 5 Figure 4 7 Typical Pulsed RF Signal TIME SECONDS lO us It is a natural reaction to think of pulsed radiofrequency as being analogous to the neural modulation effects achieved using spinal cord stimulators or TENS units However these two modalities are very different In neural modulation the therapeutic effect is achieved by applying low frequency lt 1000Hz rectangular pulses Strength A 2 4 6
40. ansformer and all mains related parts are doubly insulated from the Main Enclosure The mains transformer has separate isolated bobbins for mains and low voltage windings Thermal fuses rated to fail at 125 are fitted into all primary and secondary windings The machine is not connected to mains earth class2 STANDARDS This instrument complies with 60601 1 1997 60601 1 2 1993 60601 2 2 1998 IEC60601 2 10 With Canadian deviations With respect to electrical shock fire and mechanical hazards only in accordance with UL60601 1 IEC60601 1 CAN CSA C22 2 No 601 1 and IEC 60601 2 2 Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 2 Model NT1100 IMPEDANCE Measuring frequency Measuring source voltage Measuring Display Accuracy Features a d STIMULATION MODE Signal Shape Output Range Voltage Current Pulses Rates Motor Sensory Pulse Rate Accuracy Pulse Widths Pulse width Accuracy Morgan Automation Ltd 53KHz 3KHz Less than 500 mV AC 50 2000 ohms one ohm resolution 5 Internal 500 ohm Test Resistor Impedance in all Lesion Modes and in Stimulation Mode when stimulation is off Audible Tone available where frequency varies with impedance over full impedance range 50 2000 ohms Audible tone is adjustable and mutable Warning on screen if impedance is less than 50 ohms or greater than 2000 ohms Biphasic squa
41. ay Connector CON2 10 way Connector CON3 3 way Connector TP1 TP7 PCB Test Points Carbon Film Carbon Film Electrolytic Electrolytic Electrolytic Electrolytic Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Electrolytic KBPC 602 KBPC 602 KBPC 602 KBPC 602 Regulator Regulator Molex 39 26 3080 Molex 39 26 3100 Molex 39 26 3030 The two regulators are each mounted on heatsinks Heatsink type SW38 4 Morgan Automation Ltd 6 2 June 2006 6 3 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 AV NY A06 Surpui A JOIO YU ur Ker wibndNOO Aste E 2 5 AM I I I I I 1 I I I I I i e I MOTTHA Bit AL t 2 MOTTA Y ccr 8 2 pe VSTI ALI AOL dwy ZH0 OJ Fury I 9055 IdAL NYNSSAG 848014 WADI MOLOSTIS 80 V L 10 5 NODNOD ANY H LLAS 8S 34 LONI HUM YALTA 1YOIGHN SPEI 34 1 HINOON INOON00 Figure 6 1 Power Supply Board RF100 C Circuit Diagram June 2006 Morgan Automation Ltd 6 4 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT 1100 N338 3S31IS 390138 QHVYO
42. ch board together with its circuit diagram is given in Section 5 a b c d Mains Input Unit The Mains Input either 115v or 230v comes into the machine via a Corcom Input Unit which includes Mains Filter Dual Fuses 1Amp for 230v input 2 Amp for 115v input two pole On Off Switch and Voltage Changing Module Mains Isolating Transformer Output from the Mains Input Unit goes to a 150w Isolating Transformer which has the Mains and Low Voltage Windings on two independent isolated bobbins Thermal Fuses are fitted on the Mains Input Windings and on each secondary Winding Independent Secondary Windings are 67v at 1 25 amp AC 12v at 2 amp AC 14v at 2 amp AC 14v at 1 amp AC Power Supply Board RF100 The Power Supply is located on the bottom baseplate of the machine close to the transformer and contains full wave rectifier bridges voltage regulators and smoothing capacitors to produce a series of DC voltages These are 90v 75v under load Rectified and smoothed for Generating RF 15v Rectified and Smoothed for the Computer and Display 12v 2amp Regulated DC for Circuit Boards 12 1amp Regulated DC for Circuit Boards and Fan The Power Supply Board is fully socketed for ease of replacement with connectors for Transformer Fan and Rack All voltage with the exception of the Fan go to the Fuseboard in the rack Card Rack The main card rack in the machine contains seven circuit boards and wiring between the
43. ck WT USB video Our socket only to be used with NeuroTherm Video Unit WARNING Hazardous electrical output This equipment is for use by qualified medical personnel DANGER Possible explosion hazard if used in the presence of flammable anaesthetics NOTE Ho user servicaatie parts inside MAXIMUM OUTPUT POWER 30 WATTS E E UT 1 Mains On Off Switch This is a rocker type switch combined with an I E C connector socket with twin in line anti surge fuses in a single unit to IEC 950 2 Mains IEC Connector The three pin plug of the mains must be pushed into this socket This cannot be done incorrectly i e with the live and neutral reversed because of the orientation of the unused earth pin 3 Fuses and Voltage Changes The Neurotherm is protected by two in line fuses one on the live line and one on the neutral line These fuses are located to the right hand side of the IEC socket The fuses are 20mm Anti Surge to BS 4265 1 amp for 230v supply 2 amps for 115v supply To access the fuse holder lift protective lid from the right hand edge and hinge back the fuse carrier can then be removed The mains input unit also contains a small printed circuit card which allows the mains input voltage to be changed Note this is for factory setting only and should not be altered 4 Serial Plate This plate gives information on Rated Supply Rated Power Fuse Ratings and the Machine Serial Number 5 Rear Connect
44. condary side after the appropriate fuse to a Quad Opto Isolated Coupler which produces a digital input to the computer to indicate that all supplies are present The signal OK goes to Digital Input and is high when all supplies are present Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 el e o 311905 S 9 L_ _J me 2vve S NOD 091 O 2 02 A06 2vce HAO 53513 2v82 Agi 2901 2991 39084 it Diagram Figure 5 2 Fuse Board C June 2006 Morgan Automation Ltd Neurotherm Radio Frequency Lesion Generator Service Manual 5 5 Model NT1100 5226 ATF IMPEDANCE SAMPLE L MPSMPLE 2 P 588 T aa is a 33 n 8 Y la Ha 9 jr AN PN gt a 7 x 85 Da 25 p 2V 12 R225 500 DISPERSNE 14 8 2018 e CORDOTONY PROBE CONNECTED H CORDPROBE UNK PLUG CORDOTOMY 4 SELECT TONE 6C Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 5 6 Model NT1100 Figure 5 3 Impedance Board Circuit Diagram D ror i 3 i N 4 do a
45. d Computer Motherboard Front Panel Wiring General System Schematic RF100C RF100C RF101D RF101D RF102D RF102D RF103D RF103D RF104C RF104C RF105C RF105C RF106D RF106D RF107D RF107D RF109B RF109B RF110D RF110D RF111B RF111B RF111B RF111B RF111B RF111B RF111B Circuit Diagram Component Layout Circuit Diagram Component Layout Circuit Diagram Component Layout Circuit Diagram Component Layout Circuit Diagram Component Layout Circuit Diagram Component Layout Circuit Diagram Component Layout Circuit Diagram Component Layout Circuit Diagram Component Layout Circuit Diagram Component Layout Circuit Diagram Bus Interface Circuit Diagram Digital Outputs Circuit Diagram Ribbon Connectors and PSU Circuit Diagram Digital Inputs Circuit Diagram Analog Inputs Circuit Diagram Analog Outputs Component Layout June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 2 1 Model NT1100 2 0 WARNINGS AND CAUTIONS Warning indicates a potentially harmful situation to yourself or others HAZARDOUS ELECTRICAL OUTPUT The equipment is for use ONLY by qualified medical personnel Do NOT under any circumstance perform any testing or maintenance on the equipment while it is being used on a patient Do NOT use extension cords or adapters of any type The power cord and plug must be intact and undamaged
46. del NT1100 1 FA o 2 le o 2 71 4 NOO HAO 535014 edi 191 Agl 0 Ivor 2v91 vor 06 Ivar 6 3 fd 9 04904 it Diagram Figure 6 3 Fuse Board RF101 D C June 2006 Morgan Automation Ltd 6 7 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT 1100 ce N33HOSX1IS 019159 GHVOB 4504 017 NOILVWOLDVY NYSHOW 8 82 11 12 tein 4913 ou 01 01 48 GHVOB 3504 AE 2 1 Z dAvc u m vite eV I 901031 81 64 81814 80 4 Y AS I 881031 1 1 VIASt at V ASI seta x D C SaL 14117 AZt eat 181031 AZt tai 2 ANNI Figure 6 4 Fuse Board RF 101 D Component Layout June 2006 Morgan Automation Ltd Neurotherm Radio Frequency Lesion Generator Service Manual 6 3 Impedance Board RF 1020 Components R201 2K R202 7K5 R203 6K8 R204 6K8 R205 82K R206 15K R207 3K16 R208 3K16 R209 180R R211 3K16 R212 10K R213 10K R214 3K3 R215 3K3 R216 3K3 R217 470K R218 330K R219 200K R220 100K R221 2K2 R222 47R R223 10K R224 330K R225 499R R226 10R R227 1K R228 3K R229 12K R230 100R R
47. e Software Enable is given when the machine is in the correct operating state no errors have been monitored by the computer and the Computer Watchdog Timer is running correctly The Amplifier Board is designed to be tolerant to a shorted output and will cut out if the board detects over temperature If the Board detects a failure it sends an error signal to the Computer which will be displayed Board RF105 The Board has several different functions these are a Provide the 75v for the RF Power Amplifier b Measure the RF Current and RF Voltage being delivered by the RF Amplifier Switching RF Power to Test Load d Provide timing circuit for interlacing the Impedance and RF Signals The 75V DC Voltage from the Power Supply Board is fused on the Fuse Board and then goes to the V I Board When a condition that RF is required is determined by the computer an RF ON Enable signal is sent from the computer and switches the 75V DC through to the RF Power Amplifier RF Power at this point is not switched to the patient a whole series of conditions have to be met for this to occur Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 27 Model NT1100 RF Signal sinewave at 480KHz comes onto the Board from the RF Power Amplifier and its Voltage and Current are detected by two toriod coils the output of each is full wave rectified and produces a DC Output Voltage which is proportional
48. e tissue temperature at its surface It is for this reason that thermal monitoring of the radiofrequency tip is a good indication of the hottest portion of the lesion volumes namely the isotherm that lies closest to the surface of the electrode With the simplifying assumptions of a homogeneous medium the lesion size represented by the 45 degree isotherm increases with increasing tip temperature and also increases with increasing tip dimension particularly the radius of the electrode tip Virtual Tip Temperature o Permanent Lesiorr g 2 s 8 440 aq PLE VENCER ae 5 AA Zone of Reversibility 820 l 7 Body Temperature F Distance from Electrode Tip arbitrary units Figure 4 5 Schematic of Tissue Temperature v Distance for Electrode Tip Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 13 Model NT1100 Figure 4 5 shows a schematic diagram of the temperature of the tissue as a function of distance from the electrode tip It should be noted that the temperature is not isotropic for a non spherical electrode and thus these curves may differ at different orientations on a non spherical electrode tip The temperature at the surface of the electrode such as T2 measures very nearly the hottest tissue nearby and the tissue at greater distances falls off until it asymptotically approaches body
49. erature Board RF106 D contd R646B R647A R647B R648A R648B R649 R650 R651 R652 R653 R654 R655 R657 P601 P602 P603 P604 P605 C601 C602 C603 C604 C605 C606 C607 C608 C609 C610 C611 C612 C613 C614 C615 C616 C617 C618 C619 C620 C621 C622 C623 C624 C625 C626 Morgan Automation Ltd 133R 28K 442R 68K 3K24 1K 2K4 2K2 10K 10M 10K 10K 10K 100nF 100nF 10nF 10nF 100nF 10nF 10nF 100nF 100nF 100nF NOT FITTED 100nF 100nF 100nF 100nF 100nF 470nF 100nF 100nF 100nF 1 1 1 1 1 1 1 5 5 1 1 1 5 1 5 10nF IMF 10nF 10MF 470nF 5 0 25 w Metal Film 0 25 w Metal Film 0 25 w Metal Film 0 25 w Metal Film 0 25 w Metal Film 0 25 w Metal Film 0 25 w Metal Film 0 25 w Carbon Film 0 25 w Carbon Film 0 25 w Metal Film 0 25 w Metal Film 0 25 w Metal Film 0 25 w Carbon Film 18 tum potentiometer 18 tum potentiometer 18 tum potentiometer 18 tum potentiometer 18 tum potentiometer 63v 63v 100v 100v 63v 100v 100v 63v 63v 63v 63v 63v 63v 63v 63v 63v 63v 63v 63v 63v 100v 63v 100v 35v 63v Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Metallised Polyester Polyester Metallised Polyester Polyester Electrolytic Polyester 6 30 June 2006 Ne
50. g a number of small interface boards for the display and touchscreen is that if at some stage in the future the computer touchscreen or display were changed then the only boards requiring modification would be the small interface board or Adaptor Board Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 29 Model NT1100 4 5 Connector Panel Layout Dispersive Socket This 4mm socket is for the lead of the Dispersive Patient Plate which should be at least 200 sq cm 21 square inches Test Socket This 2mm socket is used to connect the Test Block for use in testing the thermocouple probes in the Stimulate Mode Probe Socket No 1 This 4 pin socket is used to connect single electrodes for standard RF Lesion and Pulsed RF Lesion Procedures Probe Socket No 2 This 4 pin socket is used to connect electrodes used for special procedures Probe Socket No 3 This 4 pin socket is used to connect electrodes used for special procedures Special procedures include two and three electrode procedures dual electrode procedures bipolar electrode procedures and cordotomy procedures Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 30 Model NT1100 4 6 Back Panel Layout 5 CAUTION To reduce risk of electrical shock do not remove bach pansi Reter servicing to qualified service personnel Memory socket to be used with Neuro Therm Memory Sti
51. herm Radio Frequency Lesion Generator Service Manual 5 1 Model NT1100 5 0 DETAILED DESCRIPTION OF MODULES 5 1 Power Entry Module Isolation Transformer and Power Supply Board Referring to Figure 5 1 Mains Power is connected into the rear of the equipment and goes via a Medical Filter to a double pole On Off Switch and then via two fuses to a voltage selector which is connected to the main Isolating Transformer TR1 The Voltage Selector Unit is a small printed circuit card which allows the mains input voltage to be changed Note It is for factory setting only and should not be altered The Isolation Transformer is of a double bobbin type and has four secondary windings namely Winding 1 67v 1 25A Winding 2 12v 2A Winding 3 14v 2A Winding 4 14v 1A The transformer is fitted with thermal fuses on all primary and secondary windings The transformer secondary windings are connected onto the Power Supply Board via an 8way Connector CON 1 The Power Supply Board provides the following supplies a 90v 75v under load Rectified and Smoothed for generating the RF Power b 15v Rectified and Smoothed for powering the computer and display via supplies on the Computer Motherboard c 12v 2 amp regulated DC for the circuit boards d 12v amp regulated DC for the circuit boards and fan A 10 way connector CON 2 is provided for connection of all DC voltages to the Card Rack and 3 way connector CON 3 is provided for connection of the
52. historically clear that prescriptions which involve power and current did not have lasting value but rather prescriptions that involve temperature electrode size and accounting for the heat washout caused by blood flow The importance of temperature control was not always recognized For instance in the early days of percutaneous cervical cordotomy elaborate prescriptions of current power and time for making RF lesions were established The subsequent clinical results were not consistent in the early days of cordotomies and it was only when temperature was measured at the tip of the cordotomy electrode that consistency and reproducibility was finally achieved Another important aspect of controlled radiofrequency lesion making is illustrated in Figure 4 6 This shows experimental data of the increase in lesion size for a fixed electrode geometry and a fixed tip 4 6 Incr ade in Lesion Size Time temperature The lesion size in this i situation is defined as the width of the prolate ellipsoidal width of the prolate ellipsoidal lesion volume The graph clearly shows that for constant tip temperature the lesion size grows and asymptotically reaches a maximum value Don Size at Thermal Equilibrium Lesion Size Arbitrary Units 0 10 20 30 40 50 60 in a time between 30 and 60 seconds The 45C isothermal surface can then be Exposure Time in Seconds referred to as the equilibrium lesion size Leaving the radiofrequency p
53. ing method In multiple probe operation not all pulse rates are available Features a Hardware and Software lockout if RF Power Control not initially set to zero b Warning on screen if RF Control is not initially set to zero or if Auto is selected and RF control is not off c LED Flashes on front panel to indicate machine is delivering power d Three output sockets to accept a variety of probes including cordotomy optional extra and enable multiple probe peration e Hardware lockout if temperature exceeds 95 C Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 6 Model NT1100 MAJOR FEATURES Touch Screen Operation User interface set up and software control via TP 400 processor Windows 4 2 NET Operating System 12 1 LCD Sceen with Back lighting and wide antiglare visibility Printer Support Via Bluetooth adaptor internally fitted Remote Mimic Optically isolated running over CAT5 Cable to Screen External TFT screen up to 300 metres Storage Device USB Memory Stick for downloading log files Service Ports Only accessible by service engineers for keyboard mouse Any equipment connected to rear sockets must comply with IEC60950 and IEC60601 1 Use only parts supplied by Neurotherm Ltd Any other parts will void the warranty and may cause danger to the patient Morgan Automation Ltd June 2006 Morgan Automation Ltd
54. ist of Figures 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 4 10 4 11 4 12 4 13 5 1 5 2 Morgan Automation Ltd Model NT1100 Output Power Load Resistance Curve Typical available Stimulate Output Voltage Load Resistance Fundamental Radiofreguency Circuit Mechanism of Radio Freguency Heating Schematic of Tissue Temperature v Distance from Electrode Tip Increase in Lesion Size v Time Typical Pulsed RF Signal Frequency Spectrum of a 2Hz Rectangular Pulse Frequency Spectrum of a 500 KHz Signal Pulsed RF Amplitude Control Pulsed RF Pulse Width Control Pulse Dose General Schematic of the Neurotherm 1100 Power Supply Unit Circuit Diagram Fuse Board Circuit Diagram June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 6 1 6 2 6 3 6 4 6 5 6 6 6 7 6 8 6 9 6 10 6 11 6 12 6 13 6 14 6 15 6 16 6 17 6 18 6 19 6 20 6 21 6 22 6 23 6 24 6 25 6 26 6 27 6 28 6 29 Morgan Automation Ltd Power Supply Board Power Supply Board Fuse Board Fuse Board Impedance Board Impedance Board Stimulate Board Stimulate Board RF Amplifier Board RF Amplifier Board Board V I Board Temperature Board Temperature Board Interlock Board Interlock Board Connection Board Connection Board Interface Board Interface Board Computer Motherboard Computer Motherboard Computer Motherboard Computer Motherboard Computer Motherboard Computer Motherboar
55. it whose output frequency is proportional to the impedance measured and is available if required for cordotomy procedures or during standard impedance measurements The volume of the tone can be set up on the Options screen of the machine Impedance is measured in all lesion procedures and in stimulation mode when no stimulation signal is present The output of the board is connected to an analogue input on the Computer Motherboard and displayed as ohms on the display screen Stimulate Board RF 103 The Stimulation Board provides the biphasic stimulation signals used in the Stimulation Motor or Sensory modes of the machine The board produces the following frequencies and widths of stimulation pulse Frequencies Sensory 10 20 50 75 100 150 180 200 Hz Motor 2Hz or 5Hz Pulse Widths 0 1 mS 0 2 mS 0 5 mS 1 mS These frequencies and pulse widths are selected by user via the appropriate screens and selected on the board via an appropriate BCD code from the computer via its Digital Outputs In a similar way the maximum pulse height and whether the pulse is a voltage or current pulse is selected via computer Digital Outputs The outputs available are 0 0 5v 0 3v 0 5v and 0 1 0 6mA 0 10mA The board also contains a tone circuit which is connected to the test socket on the front of the machine and is used via the test block to check stimulation pulses appear at a probe The stimulation circuit can be connected to
56. lesion tip approaches 100 C when the impedance will cease to decrease and in fact will rise precipitously as the temperature approaches the boiling point The reason for this is that the protein coagulation has a rapid onset in this temperature range causing a decrease in lonic mobility Near the boiling point gas suddenly forms around the electrode tip acting as an electrically insulating barrier thus sending the impedance to very high levels At the onset of boiling the impedance rises very rapidly In summary it is clear that the monitoring of temperature and impedance are both of great significance 4 2 2 Pulsed radiofrequency Historically radiofrequency was neuroablation This was true for percutaneous cordotomy the treatment of trigeminal neuralgia and the destruction of the medial branch nerve for facet pain Mysteries remained however It was not understood why RF lesions were so often followed by long periods of discomfort before any beneficial clinical effect appeared In the 1990s additional unanswered questions were added The mode of action of RF lesions of the lumbar sympathetic change other than for vascular disease was not understood since there were acceptable success rates though the results did not correlate with the degree of sympathetic block This led to the hypothesis by Sluijter that heat might not be the element causing the clinical effect of an RF lesion The next obvious steps were to define a method to apply r
57. lifier is also connected to a Temperature Compensation Board mounted on the rear of the probe sockets which effectively moves the Cold Junction Compensation point from the Temperature Board to the Probe Socket and hence avoids any errors due to temperature rise within the Neurotherm The output from the Thermocouple Amplifier is approximately 0 1 for 0 100 the voltage is then multiplied x 2 to give a 0 2v signal to an analogue input of the computer to display the appropriate temperature The computer via one of its analogue outputs sends out a 0 2v signal to represent the temperature the user has selected to control to This signal is compared with the measured temperature signal and when the measured signal approaches the control temperature the Board sends an excess temperature signal to the RF Power Amplifier to shut down the RF This control of the Power Amplifier is made via hardware and the computer does not form part of the control loop The measured temperature is also compared with a 95 C set temperature and if the measured temperature gets to 95 C the Power Amplifier output is shut down and the RF is also isolated from the patient via a relay This safety circuit is also a hardware only lockout The Temperature Board also contains the circuitry to generate the frequencies and pulse widths for Pulsed RF The following frequencies and pulse widths are provided Frequency 1 2 5 10 Hz Pulse Width 5 10 20 50 mS Morgan Au
58. m R609 43K 1 0 25 w Metal Film R610 2K2 1 0 25 w Metal Film R611 10K 1 0 25 w Metal Film R612 20K 1 0 25 w Metal Film R613 20K 1 0 25 w Metal Film R614 10K 1 0 25 w Metal Film R615 20K 1 0 25 w Metal Film R616 10K 1 0 25 w Metal Film R617 10K 1 0 25 w Metal Film R618 10K 1 0 25 w Metal Film R619 300 1 0 25 w Metal Film R621 130K 1 0 25 w Metal Film R622 22K 1 0 25 w Metal Film R623 1M 1 0 25 w Metal Film R624 10K 1 0 25 w Metal Film R625 10K 1 0 25 w Metal Film R626 10K 1 0 25 w Metal Film R627 9K1 1 0 25 w Metal Film R628 10K 1 0 25 w Metal Film R629 10K 5 0 25 w Carbon Film R630 10K 5 0 25 w Carbon Film R631 10K 5 0 25 w Carbon Film R632 10K 5 0 25 w Carbon Film R633 10K 5 0 25 w Carbon Film R634 10K 5 0 25 w Carbon Film R635 10K 4 commoned resistors R636 150R 5 0 25 w Carbon Film R637 2K4 1 0 25 w Metal Film R638 10K 5 0 25 w Carbon Film R639 4 7 5 0 25 w Carbon Film R640 10K 5 0 25 w Carbon Film R641A 1M3 1 0 25 w Metal Film R641B 127K 1 0 25 w Metal Film R642A 698K 1 0 25 w Metal Film R642B 16K2 1 0 25 w Metal Film R643A 280K 1 0 25 w Metal Film R644B 5 6 1 0 25 w Metal Film R644A 140K 1 0 25 w Metal Film R644B 2 7 1 0 25 w Metal Film R645A 6K8 1 0 25 w Metal Film R645B 191R 1 0 25 w Metal Film R646A 14k 1 0 25 w Metal Film Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT 1100 Temp
59. ne doing medial branch heat lesions and every patient is treated at a different temperature i e one at 80 C one at 70 C another at 60 C Would you be surprised if this resulted in variable patient outcomes Pulsed dose standardizes pulsed RF just as always using the same temperature standardizes heat RF Morgan Automation Ltd June 2006 4 21 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 50 40 62 31vQ W 134008 139008 V 9161143 OLLVIWJHOS TVH3N39 000 1 3NISN3dSIO 3134908 1nd1no 1831 N 1NON4 NS SS 60143 quvoa auvog NOuvsN3dWO2 GWOT al pd NOLLO3NNOO 4034 auvog 90 1H31NI 5314405 Ash X 2 gt QNVOHMH3H LION AHONWSW Wezi owoa H WH3JNWHOJSNVMHL ENGINEER USE ONLY 4 d i 3333 G91 77777 77 1 AVTH3AO TANVdHODnOL HLIM N33MHOS 021 HLOOLANE 1 dNI SNIVW June 2006 Figure 4 13 General Schematic of the Neurotherm NT1100 Morgan Automation Ltd 4 3 Neurotherm Radio Frequency Lesion Generator Service Manual 4 22 Model NT 1100 General Description Figure 4 13 Shows a General Schematic of the Neurotherm NT 1100 and a brief description of the various Printed Circuit Boards used is given below A more detailed description of ea
60. nector DIN41612 Type D 32way ac Handle Yellow Morgan Automation Ltd June 2006 6 38 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 yz 1 35292 2 ivu IVO 320T33LNI 35 se pa 3 gnaws 40 0i bade 8 40 5 207 6 n s 95 AN 1113 Mm b pris Wai wee 1 9 Pai 3 jooni E ME I ve BV lt D dus ia gi Q 001 B 1223 O wo 2735 282 Q Tt G 8019 T s AQ koty Q uini O 227 Da AS p 1 awaa waviv O 10157 206 o E we 5 Cs 7 he it Diagram Figure 6 15 Interlock Board RF 107D June 2006 Morgan Automation Ltd Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 Morgan Automation Ltd 6 39 June 2006 6 40 Neurotherm Radio Frequency Lesion Generator Service Manual Model 1100 N33H2JSP IS AIOWALNI BEZVZ 017 NOILIVWOL Y NYSHON 80 c Zl ANNI secu 9142 28 41 gozu een e223 En ac 500 5 er CF ae uar u toza YA s ceu can ES sd 9 HAS mum 10 Lo izo 2 2 8 8 d T 404718 192718 June 2006 Figure
61. nes RF115A and RF116A 3 3 2 Revision B Boards in rack Morgan Automation Ltd Fuse Board RF101D Impedance Board RF102D Stimulate Board RF103D RF Voltage and Current Board RF105C Temperature Board RF106D Interlock Board RF107D Interface Board RF110D Card Rack Backplanes RF115B and RF116B June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 3 4 Model NT1100 3 4 Manual Updates 3 4 1 Neurotherm Radio Frequency Lesion Generator Unit Manual Changes This is the NT 1100 Manual applicable to the machines from serial numbers shown below Issue From Page Change Date Serial No NT1100 7007 05 As issued DEC 2005 2 NT1100 7150 06 JUNE 2006 Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 3 4 2 Record of Manual Updates carried out Update Number Carried out by Name 2 Howard Clarke Morgan Automation Ltd 3 5 Date June 2006 June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 1 Model NT1100 4 0 GENERAL DESCRIPTION AND PRINCIPLE OF LESIONING 4 1 Specifications SIZE Width 400 mm 15 Z Height 300 mm 11 34 Depth 415 mm 16 WEIGHT 12 5 kg 28 165 ELECTRICAL EUROPE 230 Volts 50Hz Fused 1 Amp on live and neutral USA CANADA 110 Volts 60Hz Fused 2 Amp on live and neutral Voltage change via rear connector Power Consumption 150 watts The power supply is built to Class 2 standard The mains tr
62. oad resistor built into machine LED flashes when Lesion Power is being delivered Selectable 50 90 C for Thermal Lesion Default 80 Selectable in 5 C steps in initial screen set ups Selectable in 1 C steps when in Lesion Mode using Temp up and Temp down buttons Selectable 0 30 to 10 00 mins Default 1 00 minute Selectable in 30 seconds steps in initial screen set ups Selectable in 1 second steps when in Lesion Mode using Time up and Time Down buttons A series of fixed temperature time profiles are programmed into the generator P1 P2 P3 The user can also program a custom profile with the following characteristics Start Temperature 50 60 Default 50 Step Time 00 10 to 3 00 mins Default 2 mins Step Rise 1 C or 5 C Default 5 C Final Temperature 65 90 C Default 65 Final Dwell Time 1 00 10 00 Minutes Default 4 00 mins June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 4 Lesion Start Auto Mode Display Audible Indicator PULSE RF MODE Model NT 1100 Lesion starts as soon as temperature is within 5 C of desired temperature With Lesion Power Control off the procedure can be carried out under Automatic control by pressing the Auto start button The temperature will ramp up at 8 C per second and time will start when the measured temperature is within 5 C of desired temperature The lesioning can be stopped at any time by pressing the Auto Stop But
63. ontains interfaces which include USB TFT Display Keyboard Mouse Serial Port for Touchscreen and Flash Memory Its link to the machine is via its 64 way PC104 Interface Connector which connects directly into the Computer Motherboard Some interfaces for example the USB Memory Stick Remote Screen and Printer Bluetooth Adaptor connect from the computer card to the Adaptor Board TP400 via a short 50 way ribbon cable The Adaptor Board which is mounted on the Motherboard but not connected to it provides external connections at the rear of the machine Two other connections for keyboard and mouse for engineers use only are also provided The Computer Board has a small sub board into which the 128 MB Flash Memory Card is plugged this memory contains the working system software for the machine and a segment of its memory is used to store the readings from procedures for later downloading to the memory stick The computer also connects directly to the TFT Display and Touchscreen For the TFT Display the connection goes via a small link board which reorders the pins numbers and connectors so that ribbon cables can be used The Touchscreen goes via a small Driver Board which enables the touchscreen to connect to the RS232 interface of the computer The TFT Display has back illumination which is provided by a small inverter board mounted on the rear of the display this inverter gets a 12vDC signal from the Computer Motherboard The rationale of usin
64. or Depending on the options chosen there are a series of connectors on the rear of the generator some which are available to the operator and some which are covered over with a protective cover Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 31 Model NT1100 Connector A Memory socket available on all machines for use only with Neurotherm Memory Stick NT USB DO NOT CONNECT ANY OTHER DEVICE TO THIS SOCKET AS IT WILL COMPROMISE THE SAFETY OF THE PATIENT Connector B Video Out socket available on some machines for use only with Neurotherm Video Unit NT VD this unit provides opto isolated connection to a remote display DO NOT CONNECT ANY OTHER DEVICE TO THIS SOCKET AS IT WILL COMPROMISE THE SAFETY OF THE PATIENT Connector C Remote keyboard this connector is covered over and is a keyboard connection for service engineers only Connector D Remote Mouse this connector is covered over and is a mouse connection for service engineers only 6 Contact Address If the Neurotherm requires a routine service or in the unlikely event of the machine malfunctioning the contact address of Neurotherm Ltd is shown on the back plate The full address telephone and contact details are shown in Section 11 Ti Ventilation Apertures These apertures are to ensure the correct air circulation within the generator and should not be blocked or obstructed Morgan Automation Ltd June 2006 Neurot
65. ort Temperature 10 C to 70 Humidity 0 95 Non Condensing Pressure 140 760mmHg 0 12 200 metres 0 40 000ft 8 Storage Temperature 10 C to 60 Humidity 10 to 80 RH Pressure 520 760mmHg 0 3000 metres 0 10 000ft 9 Operating Temperature 10 C to 40 Humidity 10 to 8096 RH Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT1100 Figure 4 1 Output Power Load Resistance Curve 60 4 9 50 40 30 Wattage 20 10 50 100 150 200 300 500 Impedance Morgan Automation Ltd 1000 1200 June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 10 Model 1100 Figure 4 2 Typical available Stimulation Output Voltage Load Resistance and Stimulate Output Current Load Resistance AAA Dn Core Cur 0 100 4 88 10 2 200 4 98 10 2 500 5 04 10 1 1000 5 05 10 2000 5 07 9 84 16 14 4 Stimulate Output 12 _ Current 10 8 4 6 Stimulate Output 4 Voltage 2 3 0 100 200 500 1000 2000 Load Resistance Ohms Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 11 Model NT1100 4 2 Principles of Lesioning 4 2 1 The basic physical principles of radiofrequency ablation Figure 4 3 shows the fundamental radiofrequency og zm circuit The RF lesion generator 7 T m or power source provides a source of RF It
66. ove back panel of generator Refer servicing to qualified personnel Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 3 1 Model NT1100 3 0 INTRODUCTION AND APPLICABILITY OF THIS MANUAL 3 1 Introduction and applicability of this manual This service Manual Document No R1000 gives the information required to maintain and repair the Neurotherm Radio Frequency Lesion Generator Unit Model NT1100 The main body of this manual deals with the present production revision of the equipment Differences between equipment revision are summarised in Section 3 2 Section 3 3 lists the technical changes made to the equipment The revision of the whole equipment is changed if such technical changes are made which make some spare parts incompatible with earlier units The initial equipment numbering as shown on the rear Serial Number Plate contains no revision letter e g Serial No NT1100 7020 05 however later revisions will contain a revision letter e g Serial No NT1100 7020 05 Rev A If the whole machine is upgraded such that early machines cannot be easily amended then the upgraded machines will start from a nominated serial number as indicated in Section 3 2 Within the equipment function units such as Printed Circuit Boards will be changed or updated from time to time these may or may not introduce a revision of the whole equipment Each printed circuit board contains an identity number and a se
67. ower turned Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 14 Model NT1100 on indefinitely beyond 60 seconds will not increase the equilibrium lesion size In the past so called time dependent lesions were made in which a certain power was held by the radiofrequency generator for 10 20 seconds This too led to inconsistent results and resulted in the acknowledgment of the equilibrium lesion size as being the optimum methodology It is noteworthy that impedance monitoring has a great value in assessing the progress of a heat lesion The impedance seen by the electrode tip depends on tissue interfaces and this property has been used very effectively to distinguish between the interface of electrolytic fluids and tissue For example this has been used with percutaneous cordotomy electrodes to clearly tell when the electrode has traversed from the cerebral spinal fluid to a position of contact with the spinal cord Impedance monitoring has also been used to identify when an advancing electrode has progressed from the annulus of the disk into the nucleus pulposus The change of impedance during the heating process is dramatic It has been shown that as the tissue or medium heats up the impedance will drop This is very much related to the phenomena that the engine oil in an automobile will become less viscous as the temperature of the engine increases There is a point however as the temperature at the
68. pically caused by blood circulation The temperature distribution around the electrode tip can be calculated by making certain simplifying assumptions One of the assumptions is that the medium is homogeneous and that the factors of thermal diffusion and circulation are also uniform Under these circumstances one can calculate the isotherms surfaces of constant temperature surrounding the electrode tip for a given impressed radiofrequency voltage These isothermal surfaces are critical to determining the lesion size As it is known that living tissue will be permanently destroyed for sustained temperatures of approximately 45 C the 45 degree isotherm can be considered to be the outer border of the lesion since tissue within this volume will be thermally destroyed and tissue outside of this volume will experience lower temperatures than are necessary for cellular destruction Isothermal surfaces are indicated by the lines in figure 4 4 It is important to understand that the radiofrequency field and thus power dissipation in the tissue actually heats the tissue as opposed to the electrode itself The heated tissue in turn raises the temperature of the electrode tip and thus heats the tip Therefore it is not the electrode tip which heats the tissue but rather the tissue which heats the electrode tip If the electrode is properly designed so as not to sink away too much of the thermal energy the electrode will give an accurate representation of th
69. quency Lesion Generator Service Manual 4 19 Model NT1100 Figure 4 11 Shows Historical Pulsed RF pulse width control Pulsed RF output 9831 Z pulse width Ideal pulse voltage Temperature limit Time seconds When the temperature limit is reached the pulse width is changed as opposed to the pulse amplitude Note that the pulse width is changed the moment the temperature limit is reached the width is varied to keep the temperature limit Though this is better than amplitude control it still implies that treatments will not be consistent and uniform between patients Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 20 Model NT1100 Figure 4 12 Shows Pulse Dose a new more consistent approach Pulsed RF output 1288 4 pulse ras if Ideal pulse voltage Temperature limit Time seconds Figure 4 12 Pulse Dose In the pulse dose mode only amplitudes that are the full set voltages and widths that are the full set pulse width are delivered If the temperature limit is reached the generator stops giving output until the temperature falls below the temperature limit This guarantees that every treatment delivers the full set amplitude and pulse width The number of pulses or doses set by the operator as opposed to time thus ensuring that every treatment is consistent patient to patient Here is why pulsed dose is superior to the other methods Imagi
70. r manually or automatically reduce the pulsed amplitude or the pulsed duration in order to ensure the temperature does not exceed 42 degrees Using the pulsed dose method every pulsed is ensured to be of the same amplitude and duration This method is explained in detail in the following paragraph Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 17 Model NT1100 4 2 3 The Pulse Dose Concept Whenever Pulsed RF is used if the selected temperature limit is reached the pulse must be modified in some way to prevent the selected temperature limit from being exceeded this can be done by either 1 Modifying the pulse amplitude of the pulses i e if a 45 volt amplitude was set and if the temperature limit was set to 42 degrees and was reached the next pulses will be reduced in voltage to prevent the temperature from increasing above the 42 C temperature limit 2 Modifying the pulse width whenever the temperature limit was reached thus insuring that each pulse delivered was the full set voltage amplitude In Pulse dose the two conditions shown above are avoided A FULL pulse is always given i e if the setting is 45 volts amplitude for 20 milliseconds you will always deliver this pulse amplitude and duration If the set temperature limit is reached the generator will wait until the temperature drops below the set temperature limit and then again will give a FULL amplitude and duration pulse
71. re wave with negative edge leading This wave is available in a variety of frequencies and widths 0 5v 3 for motor frequencies 2Hz and 5 Hz 0 3v 5 Default for all other frequencies 0 0 5v 10 for all other frequencies 0 10mA 4 596 50 2000 ohms 0 6mA 4 5 50 2000 ohms 0 1 5 50 2000 ohms 20r5Hz Default 2Hz 10 20 50 75 100 150 180 200 Hz Default 50 Hz 3 0 1 0 2 0 5 and 1 0 mS Default 1 0 mS 5 for 0 2 0 5 and 1 0 mS 15 for 0 1mS June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 3 Features LESION MODE RF Waveform Power Output Voltage Display on screen Current Display on screen Self Test Lamp Indicator Temperature Range Time Special Temperature Profiles Morgan Automation Ltd Model NT 1100 a Hardware and Software lockout if voltage current control not initially set to zero b Warning on screen if stimulation control is not initially at zero c Flashing LED on front panel indicates machine is delivering stimulation pulses d Stimulation Test Socket is provided on front of machine to interface with the standard stimulation test kit e Various screen displays for displaying amplitude of each stimulation procedure 480 KHz 5 Sinusoidal Continuously variable Maximum power output 30 watts 5 into 200 ohms Power is displayed in certain Lesion Modes 0 99RF volts RMS 0 999RF milliamps RMS 150 ohm dummy l
72. requency Lesion Generator Service Manual 6 16 Model NT1100 Stimulate Board RF103D 4 Sub Board contd U306 U307 U308 U309 U310 U311 U312 U313 U314 U315 U316 U317 U318 L301 L302 L303 RL301 RL302 RL303 RL304 RL305 RL306 RL307 RL308 RL309 TP 1 6 Connector Handle Green Morgan Automation Ltd 4049B 4555B MAX313CPE MAX313CPE NE555N HCF4538BEY MAX323 TLO82 TCA0372 TLO71 LM393N 4071 NE555N 1 1 1 1 1 1 1 1 Double Pole Relay Single Pole Relay Double Pole Relay Double Pole Relay Double Pole Relay Double Pole Relay Double Pole Relay Double Pole Relay Double Pole Relay Test Points DIN 41612 Hex Inverting Buffers 1 of 4 Decoder Demultiplexer Quad SPST CMOS Analogue Switches Quad SPST CMOS Analogue Switches Timer Dual Precision Monostable Multivibrator Dual Analogue Switch Dual Operational Amplifier Power Op Amp Operational Amplifier Comparator Quad 2 Input OR Gates Timer Transformer Transformer Transformer 12v 12v 12v 12v 12v 12v 12v 12v 12v Type D 32 way ac June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 17 Model NT1100 MA sam mene mzani anan amau xt por VITA mm To morr d mos xa 24 a ae B 4 9 c NNI lun EE f p 11181111 a 5
73. rial number of the board together with the issue number designated by a letter The initial issue letter was A for all Boards In all cases the spare parts order code is also the Board Identity Number and Issue Number e g RF 102 In order to understand this manual it is necessary to have a complete understanding of the function and operations of the Lesion Generator Machine This information can be obtained from the Operators Manual which contains full operating instructions Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 3 2 Model NT1100 3 2 Summary of Equipment Revision Changes Initial production revision of this equipment Model NT1100 Initial production DEC 2005 Start from NT 1100 7007 05 From NT1100 7150 06 May 2006 Metal Rack used and all cards in rack were changed to move components away from guides Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual Model NT 1100 3 3 Summary of Board Revision Changes 3 3 1 Revision A All Boards NT1100 Initial production revision of this equipment 3 3 Power Supply Board RF100C Fuse Board RF101C Impedance Board RF102C Stimulate Board RF103C RF Power Amplifier Board RF104C RF Voltage and Current Board RF105B Temperature Board RF106C Interlock Board RF107C Front Panel and Connection Board RF109B Interface Board RF110C Computer Motherboard RF111B Card Rack Backpla
74. t voltage setting may result in Neurotherm malfunction and potential damage Morgan Automation Ltd June 2006 2 0 Neurotherm Radio Frequency Lesion Generator Service Manual 2 2 Model NT1100 WARNINGS AND CAUTIONS continued A CAUTION indicates a condition that may lead to equipment damage or malfunction Servicing of the equipment in accordance with this service manual should never be undertaken in the absence of proper tools test equipment and the most recent revision of this service manual which is clearly and thoroughly understood When repairing circuit boards great care should be taken in handling boards as all boards contain static sensitive devices Before servicing a board ground yourself and the relevant tool to discharge any accumulated static charge by wearing a wrist strap and placing the board on a static mat If a board has to be returned use anti static bags or containers The tests and repairs outlined in this manual should only be attempted by trained personnel Unauthorised service may void the warranty of the unit Check the voltage rating on the rear Serial Number Plate before connecting the equipment to AC Mains Power The equipment must never be operated at the wrong mains voltage Use insulated tools when adjusting the internal controls on the equipment When cleaning the outer casing or display panel of the equipment do not use abrasive agents or solvents To reduce risk of electrical shock do not rem
75. ter Polyester Polyester Polyester Polyester Polyester Polyester Polyester Ceramic Polyester 6 14 June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 15 Model NT1100 C318 C319 C320 C321 C322 C323 C324 C325 C326 C327 C328 C329 C330 C330A C331 C331A C332 C333 C334 C335 D301 D302 D303 D304 D305 D306 D307 0308 0309 0310 0311 0312 0313 0314 0315 0316 0317 TR301 TR302 301 9301 9302 9303 9304 9305 Morgan Automation Ltd 100MF 47nF 100nF 100nF 100nF 100nF 100nF 100nF 100nF 100nF 10nF 10nF 10Nf 1 10n 1 Select on test 47MF 47MF 1n 10uF INA148 INA148 INA148 INA148 INA148 INA148 INA148 INA148 Red LED Amber LED Amber LED BAT 85 INA148 INA148 Green LED Red LED INA148 BC337 BC337 Sounder 4049B 4028B MAX313CPE MAX313CPE MAX313CPE 63v 63v 63v 63v 63v 63v 63v 63v 63v 63v 100v 100v 100v 100v 16v 16v 100v 50v Electrolytic Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Polyester Precision Polypropylene Select on Test Precision Polypropylene Electrolytic Electrolytic Polyester Electrolytic Schottky Barrier Diode NPN Transistor NPN Transistor Hex Inverting Buffers 1 of 10 Decoders Quad SPST CMOS Analogue Switches Quad SPST CMOS Analogue Switches Quad SPST CMOS Analogue Switches June 2006 Neurotherm Radio F
76. ter C38 100nF 63v Polyester C39 10MF 63v Polyester C40 100nF 63v Polyester C41 100nF 63v Polyester C42 100nF 63v Polyester C43 100nF 63v Polyester C44 470nF 63v Polyester C45 470nF 63v Polyester Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 49 Model NT 1100 Computer Mother Board RF111B contd C46 C47 D1 D2 D3 L1 SW1 U1 U2 U3 04 95 96 U7 U8 U9 U10 U11 U12 U13 U14 U15 U16 U17 U18 U19 U21 U22 U23 U24 U25 U26 U27 U28 U29 U30 U31 U32 U33 U34 U35 U36 Morgan Automation Ltd NOT FITTED 4700MF 25v LM4040 IN4002 145355 5watt 10uH 8way DIL Switch 688 245 138 240 138 273 ULN2803A 273 ULN2803A TAHCT 273 ULN2803A TAHCT 273 ULN2803A 273 ULN2803A TAHCT 273 ULN2803A TAHCT 273 UWR 5 3000 273 4050 4050 273 4050 TAHCT 273 4050 TAHCT 273 4050 4 9152MHz ADC 12138CIN TLO72 DAC 7614 LMC 662CN LMC 662CN MC7812 Electrolytic 2 5v Voltage Reference 18v Zener Inductor June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 50 Model NT 1100 Computer Mother Board RF111B contd J1 J2 J3 J4 J5 Morgan Automation Ltd 64 way PC104 Header 50 way boxed header with short latches 51 way boxed header with short latches 4 way connector 10 way connector June
77. to the RF Voltage and Current from the Power Amplifier These voltages go to two Analogue Inputs on the Computer Motherboard and are used to display RF Voltage and RF Current Under normal circumstances the output RF is fed to an external 150ohm 100 watt Test Load fixed in the base of the machine and only passes to the Interlock Board when a Disconnect Test Load signal is received from the computer In order to measure the Impedance of the patient when RF is present it is necessary to turn off the RF for about 25mS twice a second The circuitry to carry out this signal interlacing is contained on the V I Board The key stages of measurement are a Disconnect RF from patient b Connect Impedance Measuring Circuit Wait for signal to stabilise and then sample and hold the reading d Disconnect Impedance Circuit Reconnect RF f Sample RF Then 500 ms later 9 Hold RF Signal h Disconnect RF from patient etc This interlacing procedure is triggered by pulses from the Temperature Board so that when the machine is in pulsed or dosed RF Modes the temperature measurement is carried out during the off period of the RF Interlock Board RF107 The Interlock Board provides the main final interlock to only allow RF to go to the patient if all key conditions are met It is also the point where switching of RF between outputs occurs RF arrives at the board from the V I Board and then passes to the patient via a safety relay and then
78. tomation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 26 Model NT1100 These frequencies and pulse widths are selected by the user via the appropriate screens and selected on the board via an appropriate BCD code from the computer via its Digital Outputs These pulse frequencies are also used as primary switching frequencies for the interlacing of impedance measurement during RF Lesioning and are used for this purpose on the V I Board RF Power Amplifier RF104 The RF Power Amplifier is located on the base of the machine and uses the air flow from the fan to directly cool its integral heat sink The Amplifier produces a sine wave output which is a constant voltage over a very wide patient impedance range The Amplifier is set to give 30 watts at 200 ohm load The output voltage of the Amplifier is approximately 0 75 Vrms for a DC input of 0 5 volts In Manual Mode this DC voltage comes from the RF Power Control on the Front Panel but when the Amplifier is in Auto Mode the voltage is provided by one of the Analogue Outputs of the computer The amplifier also has a Low Power Mode which is switched on when a Cordotomy Treatment is being used Output from the Amplifier is enabled both by hardware and software and both signals have to be enabled for output to be present The Hardware Enable is used for Impedance Interlacing Pulsed RF Temperature Control 95 Excess Temperature and Hardware Interlock Th
79. ton Temperature is displayed against time as a curve on the screen together with a display of Measured temperature and Time to completion of lesion RF Lesion power or voltage and current together with impedance are also displayed An alarm tone with a volume adjustment will indicate the end of the procedure In pulsed mode the waveform is pulsed rather than continuous Pulse Widths Pulse Frequencies Temperature Range Time Set Volts Current Morgan Automation Ltd 5ms 10ms 20ms 50ms default 20 ms 1Hz 2 2 5Hz default 2 Hz Selectable in 42 65 range default 42 Selectable 00 30 to 20 00 minutes default 2 00 mins Pulsed RF can be carried out in Auto Mode at fixed voltage or current Voltage range 30 70 Volts default 45 Volts Current range 50 350 mA June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 5 Model NT1100 PULSE DOSE MODE In Pulse Dose Mode the numbers of Pulses of Pulsed RF are counted Pulse Dose Procedures are carried out in Auto Mode Set Temperature 42 Pulse Counts 120 1200 count Default 240 counts Rate 2Hz Width 20 mS Set Voltage Range 30 70V Default 45V Set Current Range 50 350 mA MULTIPLE PROBES The Neurotherm can be operated with 1 2 or 3 probes When in Stimulation Mode each probe is selected by the operator for Stimulation In RF Lesion Pulse RF or Pulse Dose Mode the generator energises all connected probes in a time interlac
80. tt Metal Film 0 25watt Metal Film 0 25watt Metal Film 0 25watt Metal Film 0 25watt Metal Film 0 25watt Metal Film 0 25watt Metal Film 0 25watt Metal Film 0 25watt Metal Film 0 25watt Metal Film 0 25watt Metal Film 0 25watt Metal Film 0 25watt Metal Film 0 25watt Carbon Film 8 commoned resistor network 8 commoned resistor network 8 commoned resistor network 8 commoned resistor network 8 commoned resistor network potentiometer 6 47 June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 48 Model NT1100 Computer Mother Board RF111B contd C1 100nF 63v Polyester C2 100nF 63v Polyester C3 100nF 63v Polyester C4 100nF 63v Polyester C5 100nF 63v Polyester C6 100nF 63v Polyester C7 100nF 63v Polyester C8 100nF 63v Polyester C9 100nF 63v Polyester C10 100nF 63v Polyester C11 100nF 63v Polyester C12 100nF 63v Polyester C13 100nF 63v Polyester C14 10nF 100v Polyester C15 10nF 100v Polyester C16 NOT FITTED C17 100nF 63v Polyester C18 100nF 63v Polyester C19 100nF 63v Polyester C20 100nF 63v Polyester C21 100nF 63v Polyester C22 100nF 63v Polyester C23 100nF 63v Polyester C24 100nF 63v Polyester C25 100nF 63v Polyester C26 10MF 63v Polyester C27 100nF 63v Polyester C28 10nF 100v Polyester C29 10MF 63v Polyester C30 10nF 100v Polyester C31 100nF 63v Polyester C32 100nF 63v Polyester C33 100nF 63v Polyester C34 100nF 63v Polyester C35 100nF 63v Polyester C36 100nF 63v Polyester C37 100nF 63v Polyes
81. ty will not heat appreciably even though this same radiofreguency current will cause intense heating near the much smaller active electrode It is recommended for most radiofreguency procedures that the dispersive electrode therefore should have an area of greater than 150 sguare centimeters to be safe from any significant heat elevation when RF lesions delivering 50 watts or less are used EXPOSED INSULATED SHAFT IP The mechanism for radiofrequency heating is shown in figure 4 4 The electric field lines emanate from the active electrode tip and are created by LBS the voltage impressed upon it by the _ radiofrequency generator This electric i field creates an electric force on the p s NN SEN charged ions within the electrolytic 44 SNE medium of the tissue According to the ee physics laws this force produces a b motion and the motion is oscillatory at the frequency of the RF current NS e ee Figure 4 4 mechanisms for Radiofrequency heating Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 4 12 Model NT1100 It is this radiofrequency motion which causes the ions to rub against the surrounding fluid medium causing friction which results in the tissue heating The temperature at any point is controlled by the frictionally induced power dissipation at that point mediated by thermal diffusion and thermal convection The thermal diffusion and convection are ty
82. urn P206 200K Potentiometer 18 turn C201 1000pF 1 Silver Mica C202 120pF 1 Silver Mica C203 1000pF 1 Silver Mica C204 1000pF 1 Silver Mica C205 4 7nF 100V Polyester C208 330nF 63V Polyester C210 220pF miniature plate ceramic C211 1nF 100V Ceramic C212 2 2nF 100V Ceramic C213 1nF 100V Ceramic C214B 1800pF 1 Silver Mica C215 100MF 16V Electrolytic C216 100nF 63V Polyester C217 100nf 63V Polyester C218 100nF 63V Polyester C219 47MF 16V Electrolytic C220 100nF 63V Polyester C221 100nF 63V Polyester C224 100nF 63V Polyester C225 100nF 63V Polyester C226 47MF 16V Electrolytic C229 100nF 63V Polyester C230 10MF 16V Electrolytic D202 BAT85X D203 4148 0204 4148 0205 134148 0206 134148 0207 4148 0208 4148 0209 4148 0210 4148 0211 BAT85 D212 BAT85 D213 ZXR125ER 1 2V Reference Diode D214 IN4002 D215 IN4148 D216 LED Amber D218 ZXR 125ER 1 2V Reference Diode D219 ZXR125ER 1 2V Reference Diode TR201 BC559 PNP Transistor TR202 MPSA13 Darlington TR203 MPSA13 Darlington Morgan Automation Ltd June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 10 Model NT1100 Impedance Board RF102D contd U201 ICL 8038 CCPD Frequency Generator U202 TLO72N Dual Amplifier U203 TLO72N Dual Amplifier U204 TC9402CPD Voltage to Frequency Converter U206 LF398N Sample Hold U207 LM741CN Operation Amplifier L201 470uH L202 470uH TF201 PT4 1 1 Pulse Transformer T 20
83. urotherm Radio Frequency Lesion Generator Service Manual 6 31 Model NT 1100 Temperature Board RF106 D contd C627 C628 C629 C630 Morgan Automation Ltd 470nF 100MF 100nF 100n BZX79C INA148 INA148 INA148 INA148 INA148 INA148 INA148 INA148 INA148 BAT 85 BAT 85 Red LED Red LED Red LED Amber LED Amber LED Amber LED Green LED INA148 BAW 62 BC337 BC337 BC337 BC337 AD595A TLO72 LM311 LM311 LM35DZ 4049 4555 MAX 313 CPE MAX 313 CPE 556 TLO71 63v Polyester 16v Electrolytic 63v Polyester 63v Polyester 5VI Zemer Diode NPN Transistor NPN Transistor NPN Transistor NPN Transistor Thermocouple Amplifier Dual Operational Amplifier Comparator Comparator Precision Centigrade Temperature Sensor Hex Inverting Buffers Dual 1 of 4 Decoder Demultiplexer Quad SPST Cmos Analog Switches Ouad SPST Cmos Analog Swiches Dual Timer Operational Amplifier June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual Model 1100 Temperature Board RF106 D contd RL601 RL602 RL 603 RL 604 RL 605 RL 606 TP1 8 CON 601 Handle Blue Morgan Automation Ltd 2 pole Relay 2 pole Relay 2 pole Relay 2 pole Relay 2 pole Relay 2 pole Relay Test Points DIN41612 12v 12v 12v 12v 12v 12v Type D 32 way ac 6 32 June 2006 Neurotherm Radio Frequency Lesion Generator Service Manual 6 33 Model NT1100 4C 12V O h 12v 4 RL6
84. various card is on a 2 section backplane Morgan Automation Ltd June 2006 4 4 Neurotherm Radio Frequency Lesion Generator Service Manual 4 23 Model NT1100 Fuse Board RF 101 DC voltages from the power supply go to a Fuse Board which provides fusing as follows 12 v 2amp for logic fused 2amp 12v lamp for logic fused 1 amp 90v for RF fused 2amp 15 for Computer and Display Section is divided into two separate 15 v supplies each fused at 2 amps Each fused supply has an associated LED which indicates whether the supply is good LED ON or the fuse is blown LED OFF All fused supplies are monitored by opto isolated couplers and a Fuse OK signal is monitored by the computer General Signal Information Motherboard RF111 Part The computer is connected to a motherboard which provides an interface for a series of Digital and Analogue Input Output signals Signals provided are 29 Digital Inputs 47 Digital Outputs 8 Analogue Inputs 4 Analogue Outputs The Computer operates at 5 volts but interface to the various cards is at 12v DC The Motherboard is connected by 2 x 50 way ribbon cables to the Interface Board RF 110 Interface Board RF110 This board which sits at one end of the rack provides the interconnection between the computer motherboard the front panel keyboard and the rack The board has no active components It connects into the rack via a 96 way edge connector and connect to the

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