Respirator ABV - Intensive - Frank`s Hospital Workshop
Contents
1. ABV A U Service Manual Page 22 11 Spare Part List Pos Articleno Description 115 61 000 Ventilator ABV A ALD y y 1 90532010 Cover V2A 2 923 60 002 Manometer 10 60 mbar EE 1 3 810 60316 Trafo BV 4374 m 4 105 60 024 Buzzer gn e 5 804 60 003 Fuse 0 5A Or 8 6 P 6 804 60 001 Fuse holder _ 4 7 804 60 002 Fuse assembly 8 801 60 040 Potential earth connector 9 105 61 013 Solenoid valve 10 105 31 001 Volume valve 11 950 60 003 O ring 4x 1 5 mm 12 950 60 006 O ring 10 x 2 5 mm 13 926 60 004 Turning knob 20 mm 14 926 60 006 Cover for knob 20mm 15 926 60 005 Arrow disk for knob 20 mm 16 926 60 001 Turningknob 28 mm 17 926 60 003 Cover for knob 28 mm 18 926 60 002 Arrow disk for knob 28 mm 19 810 60 530 On Off switch 20 810 60 531 Lamp for switch Potential Earth Analog Power supply Transformer Fuse 2 x 0 5 AT CPU Buzzer il Outlet driving gas Solenoid valve Control Display ON OFF Switch H Volume valve Gauge BPM Ratio Min Press Press ABV A U Service Manual Page 23 153 61 000 Patient component ABV A Adult 1 153 61016 knurled screw 2 153 40024 base part y M 3 95060022 O ring 105 x 3 5 mm 7 4 153 61 009 rubber bellows 25 2 153 40014 plexiglas dome 6 15340032 fixing bracket 7 926 60007 turning knob black gt 8 1532. 8 1 Ventilator ABV A The ventilator can be cleaned using normal cold sterilisation solutions or soapy water Don t use volatile solvents 8 2 Patient unit Disassembly E Loosen knurled screw Pull off patient unit gt VOLUMEN 73 ea Pull clamp climp forward s Han Hao H gt l 4000 s 900 gt Pull off bellows O ring de L sp 20 300 200 100 Take off plexiglass cylinder All parts except of the base part of the patient unit should undergo a precleaning or a predesinfection which is to be carried out as follows Put all parts including rubber parts in a disinfectant solution After the exposure time prescribed by the disinfectant manufacturer thoroughly rinse all parts with water In order to avoid corrosion and the propagation of germs it is recommendable to dry the parts Do not clean rubber parts with hard or sharp objects in order to avoid damages ABV A U Service Manual Page 18 Sterilisation The rubber bellows 4 and the O ring 3 have to undergo a superheated steam sterilisation at 121 C glove program The base part of the patient unit 2 and the clamp climp 6 have to be sterilised in the autoclave at 134 C The base part of the patient unit must not be cleaned with compressed air Assembly Now that the parts are perfectly hygienic reverse order of disassembly for assembly
3. can be adjusted at the respirator breathing time ratio 2 frequency 3 Min Max Pressure Sensitivity 4 volume 5 PEEP 6 PLATEAU 7 ABV A U Service Manual Page 5 1 2 Respirator with patient unit The respirator ABV A is designed for controlled anaesthesia respiration with state of the art technology The respirator works in a pressure gas driven timed and volume constant way with the possibility to limitate the inspiration pressure at the patient unit The patient unit is designed according to the bag in bottle principle thus achieving a separation of breathing gas and control gas In addition the patient unit serves as reservoir On the upper left side of the respirator You find the ON OFF switch 1 Directly below You find the flow control valve 2 where the volume flowing to the patient s lungs during inspiration can be dosified The number of respiration cycles can be varied from 6 to 60 breaths per minute at the potentiometer frequency 3 while the ratio of inspiration and expiration can be preselected from 1 4 to 2 1 with the switch breathing time ratio 4 An excess pressure proof respiration manometer 5 indicates the pressure in the system within a range from 10 60 millibar The patient pressure can be controlled by setting of pressure alarm limits Max pressure 6 and min pressure 7 can be varied with potentiometers
4. does not fall below the set minimum pressure limit To test the correct performance of the alarm the PEEP value with the respirator switched on and the complete patient tube system connected must be set higher than the minimum pressure limit so that the measured pressure does not fall below the minimum pressure limit After the delay time an audible and visual alarm is released When the PEEP value is reduced so that the minimum pressure limit is remaining under again the stenosis alarm ceases Two minute stand by muting of audible alarm Proceed as for disconnection alarm Wait until disconnection alarm activates depress stand by key and measure duration of muting of audible alarm Failure of current alarm With the respirator switched on pull mains plug from socket and so simulate a failure of current supply Now an audible alarm must be activated 6 Check of electrical safety STK The three Parameter resistance of protective conductor resistance of insulation compensating apparatus leakage current must be measured using the test kit The maximum limit values are determined as follows Resistance of protective conductor 2020 Resistance of insulation gt 70 MQ Compensating apparatus leakage current lt 1 mA ABV A U Service Manual Page 16 7 Patient unit ABV A With every semi annual check the O rings of the gas connection nipples on the connecting unit must be exchanged Furthermore the front pa
5. volume will be reduced 1 3 3 Breathing time ratio inspiration expiration The breathing time ratio the ratio of inspiration and expiration can be preselected from 1 4to2 1 as the case might require without influencing the respiration frequency 1 3 4 Pressure monitor The pressure monitor is an electronic module separated in two pressure measurement ranges for the continuous control of the pressure the patient is subject to The patientpressure is also shown on the pressuregauge in the frontpanel of the ventilator Maximum pressure The pressure measurement range for the maximum pressure has a potentiometer which is to be used to smoothly adjust the upper respiration pressure limit for values between 6 and 60 millibar In the event that the pressure for the patient exceeds the adjusted maximum pressure the pressure monitor sets off an optical and acoustic alarm until this pressure is no longer exceeded Minimum pressure or disconnection unit The pressure measurement range for the minimum pressure has a potentiometer which is to be used to smoothly adjust the minimum respiration pressure limit value for values between 5 and 25 millibar During one respiration cycle the adjusted minimum pressure limit value has to be exceeded once and fallen short of once if this is not the case an optical and acoustic alarm is set off Flashing red minimum limit pressure value permanently exceeded Stenosis or PEEP to high or valu
6. when the set pressure is reached Otherwise the for expiration is as adjusted The result is a increasing of the respiratory frequency taking into consideration the lost inspiratory time after change over to expiration 5 5 Pressure alarms The respirator ABV A is provided with devices for recognition of disconnection and stenosis The respiratory pressure is picked up in the expiration branch on the patient component For this purpose a pressure measuring tube in the respirator is connected with the patient component ABV A via the gas connection nipple This pressure measuring tube is conducted directly to the manometer By the manometer the pressure measuring tube is connected with the two pressure sensors on the board One sensor is only used to control the signal of the other sensor With the help of the electronics of the board the analogous pressure signal is converted into digital signals and processed The software installed on the board of the processor evaluates these signals and checks them for validity and appropriate limit values The pressure alarm limit is set by means of the potentiometer for Max Pressure If the measured pressure exceeds the set maximum pressure limit an audible and visual alarm is immediately released The disconnection alarm limit is set by means of the potentiometer for Min Pressure If the measured pressure does not exceed the set minimum pressure limit an audible and visual alarm is imm
7. 42022 switch lever 9 153 62 023 front plate complete with accessoires 12 Maintenance In accordance with the Regulation of Security of Medical and Technical Equipment MedGV medical technical equipment has to undergo regular inspections Such an inspection has to be carried out exclusively by authorised persons service personnel of the supplier of the equipment Regular maintenance and inspection every six months You achieve the best guarantee by concluding a maintenance agreement which includes regular inspections every six months with automatic replacement of parts with a risk of wear In the event that maintenance is carried out by unauthorised personnel without the necessary expertise the liability of the manufacturer for the secure function of the equipment ceases immediately
8. Before putting on the patient unit lubricate the thread of the knurled screw 1 with a bit of grease ABV A U 9 Error flow diagram 9 1 Respirator Service Manual Page 19 respirator without volume valve closed open volume valve respiration pressure PEEP to high tidal volume of patient part differs extremely from that of the volumeter difference 300 ml 9 2 Pressure monitor PEEP diaphragm sticks caused by inadequate sterilisation for example inspiration valve or expiration valve installed incorrectly for example missing valve plate result inconstant volume untightness in the circular system excess valve not in position CL clean PEEP diaphragm control inspiration and expiration valve check for tightness switch excess valve to position CL minimum pressure alarm is set off excess pressure alarm is set off preselected minimum pressure limit value to small PEEP above minimum pressure limit value disconnection at the anaesthesia apparatus circular system changes of with respect to the patient compliance resistance TUBUSLAGE pressure limit below PLATEAU pressure upper pressure limit value below top pressure of respiration change of TUBUSLAGE change with respect to the patient stenosis select minimum pressure limit value of more than 10 millibar reduce PEEP or increase minimum pressure limit value search d
9. Display ON OFF Switch 0 Volume valve Gauge BPM Ratio Min Press Press 3 1 Electronic The electronic of the ABV A is according to the different tasks divided in 4 printed circuits connected via a SPI Bus or wire The circuits are Users circuit Frequency adjustment RATIO Adjustment Min Max Pres limits switches for CMV IPPV audible alarm mute visual Alarms 2 Analogue circuit converting of analog signals valve supporting IC s 3 CPU steering and controlling of all functions control display watch dog 4 Power supply central connecting of all wires current and voltage supply The electronics of the microprocessor controlled respirator require no servicing The control system runs through test programs at each putting into operation which activate visual and audible alarm in case of malfunction In semi annual cycles the apparatus has to undergo the following servicing inspections and adjustments ABV A U Service Manual Page 12 3 2 Pneumatic Volume valve Check volume valve for leakage If leakage occurs at the spindle change the inner O rings 4 x 1 5 mm Lubricate eventually using silicone grease The volume valve is adjusted so that in the closed position a minimal volume max 100 ml is given to the system to avoid incorrect adjustments Solenoid valve Check solenoid valve for leakage while the volume valve is complete open an
10. In the case of exceeding the alarmlimits an optical and visual 8 alarm is released In the event of a power outage an acoustic signal sets off a warning for at least 30 sec With the change lever 9 of the patient unit either respirator respiration or manual respiration can be selected The PEEP valve 10 serves to increase the pressure at the end of expiration to a maximum of 10 millibar With the use of the plateau valve 11 You achieve a respiration with a constant upper pressure limited to a maximum of 60 millibar Only ABV U The respirator ABV U can support spontaneouse ventilation of a patient For that reasons is an additional membran key assist control on the frontplate The trigger sensitivity can be adjusted with the potentiometer Sensitivity 12 Service Manual Page 6 1 3 Adjustment of parameters at the respirator 1 3 1 Change of inspiration flow at the flow control valve In principle it is possible to vary the inspiration flow at the flow control valve in order to reach a tidal volume of 0 1500 ml In relation with the plateau pressure however certain respiration curves can be generated 1 3 2 Frequency adjustment The frequency breaths per minute can be adjusted for values between 6 and 60 breaths per minute When adjusting the frequency take into account that with an increased frequency the breath minute volume remains constant but that the tidal
11. RICAL SAFETY STK T PATIENT UNIT ABV A Page 2 A oo CO 10 11 11 12 12 12 12 13 13 14 14 15 16 Service Manual Page 3 8 CLEANING amp STERILISATION 17 8 1 Ventilator ABV A 17 8 2 Patient unit 17 9 ERROR FLOW DIAGRAM 19 9 1 Respirator 19 9 2 Pressure monitor 19 10 SPECIFICATION SHEET 20 10 1 Ventilator module ABV A 20 10 2 Patient component 21 11 SPARE PART LIST 22 12 MAINTENANCE 23 ABV A U Service Manual Page 4 1 Description of construction and function 1 1 Complete scheme The respirator module is equipped with a pneumatic and with an electronic control unit respirator ABV A and patient unit and with an electronic control monitor for breathing pressure The electronic of the respirator module is supplied with line voltage 230V 50 c p s while the pneumatic unit requires a propellant gas in form of compressed air 3 5 bar The respirator ABV A is designed for the anaesthesia respiration of children and adults in a semi closed system The patient unit can be exchanged quickly due to its quick release fastener and meets the highest requirements for hygiene because of its easy dismountability partly autoclavable with a temperature of up to 134 C General description The respirator ABV A has to be supplied with compressed air as propellant gas with a pressure of 3 5 bar 1 The various respiration parameters
12. STEPHAN Ventilator ABV A U ATEMZEITVERHALTNIS MAX DRUCK NSP SP mbar RESPIRATOR EIN AUS MIN DRUCK mbar mbar 50 SENSITIVITAT AP mbar EXPIRATION 5 RESPIRATOR A PEEP A PLATEAU max m inm mbar Service Manual STEPHAN GmbH Medizintechnik D 56412 Gackenbach Kirchstr 19 Tel 06439 9125 0 Fax 06439 9125 111 info stephan gmbh com www stephan gmbh com ABV A U Service Manual Contens 1 DESCRIPTION OF CONSTRUCTION AND FUNCTION 1 1 Complete scheme 1 2 Respirator with patient unit Only ABV U 1 3 Adjustment of parameters at the respirator 1 3 1 Change of inspiration flow at the flow control valve 1 3 2 Frequency adjustment 1 3 3 Breathing time ratio inspiration expiration 1 3 4 Pressure monitor 1 3 5 Control limit value IPPB 1 4 Patient component ABV A 1 4 1 PEEP adjustment 1 4 2 PLATEAU adjustment 1 4 3 Change lever Respirator manual 1 4 4 Bjektor GAS EVAC 1 5 Patient unit for paediatric respiration 2 FUNCTION SCHEME 2 1 Technical course of events during inspiration 2 2 Technical course of events during expiration 3 SERVICING OF BASIC APPARATUS 3 1 Electronic 3 2 Pneumatic 4 SIGHT CHECK 5 PERFORMANCE CHECK 5 1 Self test of respirator 52 Errorcodes Operation Display 5 3 Operating mode CMV 5 4 Operating mode IPPV 5 5 Pressure alarms 6 CHECK OF ELECT
13. additional and completely controlled respiration lift in accordance with the preselected respiration parameters In the event that the spontaneous respiration of the patient ceases completely the respiration frequency will be reduced to the preselected values and controlled respiration will be continued automatically The suction that has to be generated by the patient to trigger respiration in this mode can be varied with a sensitivity of 0 2 2 millibar of pressure difference at the adjusting knob for sensitivity In the event that the respirator is operated with a positive pressure at the end of expiration the trigger level is adapted to this value automatically Service Manual Page 8 1 4 Patient component ABV A 1 4 1 PEEP adjustment The so called positive end expiratory pressure is to be adjusted with the left control of the patient unit The reason for this increase of the pressure curve during expiration is to prevent the collapse of alveoli or even to inflate collapsed alveoli again in order to make their participation in the gas exchange possible This PEEP is smoothly adjustable from 0 to 10 millibar existing however a certain dependence from the fresh gas flow which has to be taken into account for the adjustment 1 4 2 PLATEAU adjustment The maximum inspiration pressure is to be adjusted at the right control of the patient unit The purpose of this so called plateau is to keep the breathed gas in
14. d the ventilator is switched off At the outlet of the solenoid valve should be no gas flow If a leakage occurs change solenoid valve Manometer Check of respiratory pressure manometer for correct zero position correction by means of a screwdriver through the setting aperture in the Plexiglas cover Since a mechanic capsule spring manometer is used for gauging pressure it must be checked whether the mechanic dial train is still working faultlessly Otherwise the respiratory pressure manometer must be exchanged M UD m ras T 20 mom T Sq Bere av g m e Li zo MT F d AU Tani n ida nae a E I Patient unit connector Check the Rings of the connection block for damages Change Rings 10 x 2 5 mm if necessary Lubricate eventually using silicone grease 4 Sight check Inspection of apparatus for visible external damages 5 Performance check 5 1 Self test of respirator Note All following tests require the presence of a circle system or narcotic system Magill Jackson Rees etc and a gas mixing unit supporting the system with a freshgas flow Service Manual Page 13 On the upper left side of the respirator You find the ON OFF switch Depressing it starts a test program with an automatic self test which checks all keys switches and potentiometers Furthermore the functioning of magnetic valve pressure s
15. e permanently not reached disconnection In the event of an existing disconnection inside the system followed by a considerable pressure drop the disconnection warning is set off with a delay of 15 seconds ABV A U Service Manual Page 7 By pressing the STAND BY foil button of the pressure monitor the acoustic alarm can be suppressed for 2 minutes The pressure monitor is to be set in operation with the operating switch of the respirator In case of an artificial respiration without the respirator the pressure monitor is not working 1 3 5 Control limit value IPPB As an option with this respirator model a pressure controlled respiration IPPB can be carried out For this kind of artificial respiration expiration is induced when a preselected maximum pressure is reached For this purpose the excess pressure limit value of the integrated pressure monitor serves as pressure control The next inspiration cycle then will be set off by the time determined by the frequency Respirator ABV U In order to be able to work more successful in cases where the spontaneous respiration of the patient has not yet failed completely or is showing signs of coming back we offer a ABV U put in respirator with integrated pressure monitor for assisted controlled or pressure controlled respiration Caused by the inspiration efforts of the patient a below atmospheric pressure is generated inside the system causing the respirator to carry out an
16. ed from 0 to 400 ml Service Manual Page 9 2 Function scheme 2 1 Technical course of events during inspiration Funktionschema Used NE EE EE 1 ower me EE REE Wm ee Driving yh Valve gas Driving L Air Oz gas exhaust aas PEEP Valve 0 12mbar Exspiration PLATEAU Valve ES 2 eN 65 mbar Excess valve for manua Freshgas At the beginning of inspiration the solenoid valve of the respirator opens and remains open during the period of time that has been preselected for inspiration In the patient unit the system is made tight with respect to the ejector and the surrounding area by pressure applied to the PEEP diaphragm and the pressure is limited at the plateau valve The pressure built up in the plexiglass dome presses the fresh gas and the breathing gas for the patient out of the bellows thus bringing it to the patient The respiration pressure that is building up can be read simultaneously from the manometers of the respirator and the circular system In the event that the respiration pressure reaches the adjusted plateau pressure limit before the time for inspiration is over the plateau valve opens and propellant gas is emitted to the surrounding area A continuous control of pressures during inspiration is guaranteed by the pressure monitor In the event of exceeding a preselected pressure limit an opt
17. ediately released To test the correct performance of the pressure alarm the Y piece must be connected to a test lung with the respirator switched on Maximum pressure is set at 40 mbar minimum pressure at 10 mbar and plateau pressure at 50 mbar PEEP 5 mbar If the set maximum pressure limit is exceeded an audible and visual alarm must be activated immediately and continue for duration of exceeding When the measured pressure falls below the set pressure audible and visual alarm are cancelled Service Manual Page 15 Disconnectionalarm To test the correct performance of the disconnection alarm the corrugated tube of the narcotic system has to be pulled off from the patient component with respirator switched on so no more built up of pressure can take place Maximum pressure is set at 50 mbar minimum pressure at 10 mbar and plateau pressure at 40 mbar PEEP 5 mbar A disconnection alarm is released after a delay time length of delay time depends on the set expiration time plus 15 sec e g BPM 15 min 1 E Ratio 1 1 gt Texp 2 sec gt 28 15s 175 After slipping the corrugated tube back onto the patient component and according built up of pressure in the patient tube system the alarm must be automatically cancelled Stenosis alarm A stenosis alarm is released if after a delay time length of delay time depends on the set expiration time plus 15 s s ab the respiratory pressure
18. ensors and parts of the hard and software and digital switching circuits is tested If a fault is detected the respirator gives off an audible signal and switches itself off If a defect occurs the display on the electronic block inside of the ventilator gives an information about the type of the defect To look onto the display you have to remove the cover 5 2 Errorcodes Operation Display The display shows the condition of the solenoid valve 1 Inspiration Expiration Errorcodes Different errorcodes can be generated on the display Reading 0 Fault in the circuit of the potentiometers Check connecting wires or poti Reading 1 Fault in the circuit of the pressure sensors Check tubes for leakage Reading 2 Fault in the circuit of the solenoid valve Check connecting wires Reading 3 Power failure 5 3 Operating mode CMV Check of the set respiratory frequency The respirator is adjusted so that no pressure alarms or stenosis alarms are released Respiratory frequency BPM is set at 6 min and the respiratory time ratio I E at 1 4 The values for inspiration time and expiration time must then be measured by hand stopwatch Frequency must be calculated accordingly The calculated frequency must correspond with the set frequency If this is not the case an error exists in the software of the respirator In this case the manufacturer must be notified All measured a
19. ical and acoustic alarm is set off ABV A U Service Manual Page 10 2 2 Technical course of events during expiration Expiration ERE When the selected inspiration time is over the solenoid valve cuts the gas supply and opens the system towards the surrounding area The excess pressure in the lungs of the patient closes the inspiration valve and opens the expiration valve The patient breathes through the expiration valve into the inflating bellows which is pressed down The superfluous consumed breathing air is conducted through the diaphragm of the PEEP valve to the anaesthesia gas extraction During this process the diaphragm keeps up as much pressure in the system as is determined by the adjusted PEEP value The reduction of the respiration pressure and the remaining pressure at the end of expiration are displayed by the manometer of the circular system and that of the respirator By switching to hand respirator the manual respiration bag is directly connected with the system thus allowing manual artificial respiration Note If switched over to manual respiration the PLATEAU valve is out of function and the excess valve has to be opened to control the max pressure of the patient ABV A U Service Manual Page 11 3 Servicing of basic apparatus Potential Earth Analogcurcuit Power supply Transformer Fuse 2 x 0 5 AT CPU Buzzer Outlet driving gas Solenoid valve 1 Control
20. isconnection and re establish connection reduce PLATEAU pressure or increase pressure limit reduce respiration pressure or increase upper pressure limit ABV A U 10 Specification sheet Service Manual 10 1 Ventilator module ABV A Measurements Width Height Front to back size Weight Fuses Line voltage Absorption of power Respiration frequency Breathing time ratio Pneumatometer Power outage alarm Pressure monitor Measuring range Measuring accuracy Measuring principle Excess pressure alarm limit value adjustable Minimum pressure alarm limit value adjustable Alarm for excess pressure minimum pressure acoustic alarm 530 mm 120 mm 280 mm 12 kg 2 0 5 A trg 3x 20 mm 230 V 50 c p s 18 VA 6 60 breaths per minute insp exp from 1 4 to 2 1 10 60 millibar excess pressure proof to 600 millibar acoustic for at least 30 sec 0 60 millibar 1 piezoresistent pressure pick up from 5 60 millibar from 5 25 millibar LED red visual LED flashing red visual electronic can be suppressed for 2 minutes ABV A U Service Manual 10 2 Patient component Tidal Volume 0 1500 ml adult version of patient unit 0 400 ml paediatric version of patient unit PEEP valve 0 10 millibar PLATEAU valve 10 60 millibar upper pressure limitation Page 21
21. nd calculated values must be registered in the test records Respiratory frequency 60 sec inspiration time expiration time allowed Tolerance 5 or 3 BPM what ever is bigger From the measured values for inspiration and expiration the set value of respiratory frequency must result by calculation Furthermore the set respiratory time ratio must result by calculation from the measured values for inspiration and expiration Respiratory time ratio I E Insp time expir time allowed Tolerance 5 ABV A U Service Manual Page 14 The calculatory check of respiratory frequency and respiratory time ratio must be repeated in the same mode as described above with the following settings Respiratory frequency 12 l min I E 1 2 Respiratory frequency 30 l min I E 1 1 5 4 Operating mode IPPV With IPPV ventilation it must be checked whether a change over from inspiration to expiration takes place when the set maximum pressure is reached Set respiratory frequency at 6 l min and the respiratory time ratio I E at 1 4 By means of the plateau valve on the patient component plateau pressure is set higher than the maximum pressure value When the respiratory pressure reaches the set maximum pressure value during inspiration time the change over to expiration must take place prematurely Note In the IPPV mode the time for inspiration can be shorter than adjusted because ofthe change over to expiration
22. nel of the patient component should be loosened and removed semi annually All removable accessible parts should be cleaned with alcohol We especially point out that the inner part require intensive control and if necessary cleaning In case of considerable wear mechanical actuation the PEEP valve disc must be exchanged The valve spindles must be tested for smooth working lubricate eventually using silicone grease The O rings of the valve spindles O ring 12 x 1 must be checked for intactness and must be exchanged if necessary If this has been completed put the front panel back on In doing so care has to be taken that the springs are placed correctly in the fairleads of the spring spindles Performance of the patient component must be tested prior to the final tightening of the front panel an eventual slight adjustment of the front panel on the basic body may be necessary align with the outer edge Finally the patient component attached to the respirator is operated with a flow of approximately 5 litres and with a narcotic system with a testlung Hereby the control knobs have to be checked and eventually readjusted The plateau control knob has to be installed so that at its right hand stop a pressure of 65 mbar is just reached The PEEP control knob has to be installed so that at its right hand stop a pressure of 12 mbar is reached Service Manual Page 17 8 Cleaning amp Sterilisation
23. side the lungs for a short moment and at a constant pressure in order to improve the alveolar gas exchange In addition the plateau can be used as upper pressure limit value or as a security device against excess pressure The plateau value can be varied within a range from 10 to 60 millibar The plateau is only to be regarded as a pressure limitation and is not meant to be regarded as part of a pressure controlled respirator 1 4 3 Change lever Respirator manual If a electrical power failure occurs you can switch over to manual ventilation by moving the handle at the left side of the patient unit from Respirator to manual A rebreathing bag has to be connected at the outlet Handbeatmung manual of the patient unit and the excess valve at the circle system has to be adjusted to the max patient pressure 1 4 4 Bjektor GAS EVAC To evacuate the excess gas a tube can be connected at the outlet GAS EVAC The connector is Iso cone of 30 mm 1 5 Patient unit for paediatric respiration In order to allow the use of the anaesthesia apparatus for paediatric respiration without having to carry out greater modifications we designed a special plexiglass dome with an inner tube A rubber bellows developed for the artificial respiration of children is to be introduced in this inner tube This plexiglass dome with rubber bellows can be exchanged easily in next to no time The volume of this paediatric system can be vari
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