IH Spinal Cord Impactor Users Manual v4.0
Contents
1. In both the down stroke and up stroke of the tip non linear aspects of the curve may be present Page 14 of 20 User s Manual PSI IH Impactor This is seen as the flattening out of the slope of the graph during the impact run Non linear areas such as is shown in Figure 12 are typical and do not adversely affect the impact Force vs Time graph Force vs Time Force K dynes 260 250 170 Maximum Force Applied ibis F oint at which Tip 140 Touches Tissue 7a Background Noise in i iilis pH 1 r 5 dam 0 123 45 0 7 8 0 1011121314151617 1951920212223 242520 27 28982930 Time msi FIGURE 13 Force vs Time Graph with Key Points Labeled The Force graph plots the force value measured in kilodynes recorded by the force sensor on the impactor tip against the time of the impact experiment The force graph consists of several small bumps and one larger peak The small bumps represent background noise the force sensor picks up as it encounters the small resistance of the tip during its drive down and up The large peak is when the tip impacts the tissue The tip is considered to be impacting tissue at a force of 20 kdyn If an impact is ever observed where the force exceeds 20 kdyn before t Osec i1 e impact experiment begins with force above 20 kdyn then the actual displacement value will read as zero This can happen if the spinal cord is not secure and moves during impact At 20 kdyn a red vertical line will be struck to in2. Left Frame This frame is where the experiment is setup and run from When running an experiment first choose which impact mode you want to use The default is to run a force experiment At the Experiment Mode present time the displacement experiment option is quce unavailable in the current software release Look to the PSI website for future updates When running a force experiment the force input field is highlighted and the displacement is made unavailable Figure 8 Clicking on Displacement Experiment will highlight the displacement input field and make the force input field unavailable The velocity field while active currently has no bearing in how the experiment is run This can be left to the default value The dwell time is an alterable value though Dwell time is defined by the length of time the impactor tip remains at its final displacement following application of a previously defined force For example if a 50 kdyn force is applied and the displacement is 475 microns a setting of 5 in the dwell time field would instruct the instrument to hold the impactor tip at that C Displacement Page 10 of 20 User s Manual PSI IH Impactor displacement for 5 seconds before withdrawing The amount of force applied to the cord will NOT remain at 50 kdyns because of spinal cord tissue dynamics The default value for dwell time is zero indicating that the impactor tip will withdrawal immediately after reaching the desired impa
3. applications Warranty policy 1s subject to change without notice How You Can Get Service Warranty service can be obtained by notifying Infinite Horizon LLC in writing at the following address Precision Systems amp Instrumentation 5221 Nottinghill Fairfax VA 22032 Phone Fax 703 978 23 19 Page 20 of 20
4. is being displayed click File gt New from the top menu Set up the experiment by entering the desired force and dwell time values in the appropriate input field in the setup frame Suggested force range values Rat values between 100 and 200 kdyn Mouse values between 30 and 70 K kdyn The suggested values result in varying degrees of contusion resulting in a range of morphologic change to the spinal cord The reproducibility of damage will vary depending upon the reproducibility of the way the animal 1s positioned with the stabilizing forceps and the manner in which the spinal cord is exposed As with any surgical technique this will require practice by the experimenter for consistency and reproducibility Once the settings are entered it is recommended to do an air impact to test the correct setup of the machine In an air impact the displacement graph should be plotted the force graph should be near zero since there was no force of impact in air and the chart should be filled in with raw values Positioning the animal The experimental table contains the moveable arms and Adson forceps used to stabilize the spinal column prior to injury The table can be removed from the IH Impactor by sliding it forward away from the vertical column supporting the impacting motorized mechanism This provides easy accessibility to the flex ball joints and support arms and to the Adson forceps Once the experimental animal has been properly positione
5. Carefully remove the bubble wrap on the sensor and clamping mechanism One portion of the clamping mechanism will be attached to a stand post as shown in Figure 3 Care must be taken not to damage the encoder strip that is attached to the top portion of the impactor rack Make sure that the encoder strip is properly aligned To Encodes strip assure proper alignment move the impactor rack with encoder strip attached to a height such that the entire encoder strip is above the slot in the position sensor Move the clamping mechanism of the position sensor to a position midway on the stand post and lightly tighten It may already be in that position Slowly move the impactor rack and encoder strip down towards the slot in the position sensor It is important that the rack and encoder strip have sufficient room to move upward and downward and do not bind to any part of the 1 tor Figure 3 Position Sensor Assembly nit ME be some resistance in movement of the impactor rack since it 1s controlled by a gear attached to the stepping motor on the side of the impactor The encoder strip should be in a position such that the position sensor lies midway between the top and bottom of the encoder strip as shown in Figure 4 It is very important the during the final alignment that the encoder strip lies flush against the side of the position sensor Figure 4 Encoder Strip Properly Positioned Page 6 of 20 User s Manual PSI IH Impactor
6. Figure 11 the displacement graph will be drawn Figure 12 the force graph will be drawn Figure 13 and the raw value chart will be filled in Figure 14 In the example shown Experiment Settings here the instrument was set to use 100 kdyn of force with the actual force applied being 103 kdyn The impactor tip displaced the cord by 617 m at a velocity of 0 124 m sec The impactor tip did not dwell for any appreciable amount of time Actual 103 Desired Force K dynes 100 Displacement uy 617 Velocity mms 124 ERCE Dwell Time 3 FIGURE 11 Experiment Settings with Actual Values Page 13 of 20 User s Manual PSI IH Impactor Displacement vs Time graph Displacement vs Time Disp microns 2500 2000 slowing of Retraction icis of impactor Tip Point atiwhich Desired Force s Acheved Tip Tissue Int Threshold ace Point when impactor Begins to Retract 300 200 N JAT 100 0 123453 G6 7 8 9 10114213141516 17 181920212223 24252027 292930 Time ms FIGURE 12 Displacement vs Time Graph with Key Points Labeled The Displacement graph plots the displacement of the tip relative to its farthest point in the tissue in microns against the time taken for the tip to drive down impact the tissue and retract measured in milliseconds The graph is always zeroed on the displacement axis at the lowest graph point that point being where the tip is furthest into the tissue This is therefo
7. Settings Currently the default Serial Port settings are configured to properly work with the Control Unit Altering serial port settings will cause the IH Impactor to stop responding However should the serial port settings need to be view or changed they can be found by clicking on View Serial Port Settings If there is a problem with the IH Impactor customer service may ask for these settings There is also an interface to communicate directly with the Control Unit This will never be used during an experiment This is simply for customer services troubleshooting purposes It can be accessed by clicking View gt Serial Terminal Upgrading Firmware From time to time new improved versions of the firmware will be released via the PSI website The firmware is the program that the control unit runs when conducting an experiment This is permanently stored in the control unit and is typically never seen by the user The software has the ability to reprogram the control unit should a new firmware version be released or the existing one need to be reinstalled To do this click on File gt Upgrade Firmware An Open File window will appear Find the firmware file it has a hex file extension The current version of the firmware will be found in Installation Directory gt Firmware where Installation Directory gt is typically CAProgram FilesPSIMH Impactor When the firmware file is loaded a progress bar will pop up and ask to begin upgrading
8. The control unit Figure 5 1s the interface between the IH Impactor and the computer running the IH Impactor software The rear of the control unit has several different connectors It is important that the different components of the impactor be securely connected for proper operation The connectors on the back of the control unit are all different ensuring proper connection of the different cables Infinite Horizon Impactor Serial Port Force amp Motor Position Leni Sensor BITS CAR E fi J y AA C s i A Figure 5 Back of the Control Unit Check to see that the position sensor interface cable is completely connected to the 5 prong connector on the position sensor Figure 6 Connect the other end of the interface cable to the rear of the control unit at the connector marked Position Sensor Figure 5 Connect the stepping motor interface cable to the IH Impactor control unit The interface cable is already attached to the stepping motor Figure 6 The opposite end of the cable should be attached to the rear of the control unit at the connector marked Motor Control Figure 5 Connect the force sensor interface cable to the IH Impactor control unit Figure 5 at the position marked Force Sensor The interface cable is already attached to the force sensor Page 7 of 20 User s Manual PSI IH Impactor Josition Sensor f interface cable Stepping motor mterface cable FIGURE 6 Side View
9. User s Manual PSI IH Impactor IH SPINAL CORD IMPACTOR by Precision Systems amp Instrumentation USER S MANUAL IH Spinal Cord Impactor 1 File Edit View Help OSW eela 10 2002 10 xl Experiment Mode Force C Displacement Experiment Settings Desired Force K dynes hon o Displacement 0 Velocity mms 1 o DwellTime sy o Experiment Comments start Experiment Ready Displacement vs Time TTE one Position Force Position Force BHBBEBRHERHGHHERHRHRHAH HER HU IZ nugm gara 220 2 2229 24 25828 ZT220 22 EDD ee Force vs Time E dran caHHsEBaHEHSHHEBRBGHEBZHHEBHs 1213 unge iru mmt zz ze STE ee rr pum Z4 Page 1 of 20 User s Manual PSI IH Impactor Site Requirements for the PSI IH Impactor 2002 A suitable environment is important for the proper optimal performance of the IH Impactor 2002 Power Considerations The IH Impactor accepts a line voltage in the range of 110 115 V with a line frequency of 60 Hz Consequently there is no voltage selector in the rear of the instrument It is recommended that the instrument be connected to a power surge protected power strip rated at 1200 or greater Joules This will protect the sensitive computerized circuitry in the control against damage from harmful power surges and spikes Shock hazard or damage to the IH Impactor may result if the IH Impactor is connected to a line volt
10. ach Set up the PSI IH Impactor and Control unit When fully assembled the IH Impactor should look similar to Figure 2 Position sensor mee rack HW Force sensor TRE i Spinal cord stabilizing forceps S Force sensor ERN d Figure 2 Assembled Impactor Page 5 of 20 User s Manual PSI IH Impactor When properly assembled the IH Impactor should appear similar to the above picture The removable experimental table has two permanently mounted support arms with flexible ball joints These arms hold the Adson stabilizing forceps The experimental animal will be positioned between these two forceps with the exposed spinal cord directly beneath the impactor tip and force sensor The stepping motor located on the right side of the IH Impactor drives the impactor rack downwards On one end of the impactor rack is the force sensor and impactor tip while on the other end is an encoder strip that activates the position sensor held in place by the position sensor clamp The experimental table on which the animal is placed can be carefully positioned under the impactor tip prior to injury with the aid of two horizontal control wheels The vertical height of the impactor tip can be initially adjusted with the vertical hand wheel One of the most important components of the IH Impactor is the position sensor This sensor is attached to a clamping mechanism that ultimately attaches to a small stand post on the top of the impactor
11. age higher than specified Never operate the IH Impactor from a power outlet that has no ground connection Never use a power cord other than that supplied with the IH Impactor Never use cables other than those supplied with the IH Impactor to ensure proper functionality Bench space The IH Impactor dimensions and weight allow for maximum flexibility to fit almost any desk or laboratory bench The impacting portion of the instrumentation should not be placed on the control unit during operation It is recommended that the control unit be placed such that it can achieve adequate ventilation during operation Do not block the ventilation slots on the top of the control unit It is also recommended that if a laptop computer is running the provided software it should not be placed on the control unit during operation Environment The IH Impactor will work within temperatures and humidity that are specified by the computer the instrument is interfaced with For practical purposes this would be within the range of 65 F to 85 F and humidity 40 to 95 In order to function properly do not place the IH Impactor on a vibrating surface or near vibrating objects Unpacking the PSI IH Impactor Upon receipt or your IH Impactor control unit and cables inspect the shipping containers for any signs of damage If containers or cushioning material are damaged save them until the contents have been checked for completeness and the impactor and contr
12. al inspection of the injury comments can be recorded in the Experiment Comments box With each experiment run the software will automatically log the date and time in the Experiment Comments box Comments may be as long as necessary The comments box with begin to scroll once the available area has been filled Page 16 of 20 User s Manual PSI IH Impactor Additional Software Features This next section will discuss additional software features These include saving printing and other utilities Saving The Experiment Data To save an experiment data set click on File gt Save or File gt Save As The save works in the Same manner as any other Windows program save feature Saving the experiment will include all the raw data actual values and experiment comments in a file with a exp extension These files are user readable if opened in a standard text editor should the need arise Saving the Experiment Data as a Comma Delimited File Excel Readable To save an experiment as a comma delimited file click on File gt Save As Comma Delimited File Doing this will save the experiment data as a cvs file This file may then be imported into Quatro Pro Excel or any other spreadsheet program Open Experiment Data File exp To open a previously saved experiment click on File gt Open The open works in the same manner as any other Windows program open feature The newest version of the software is able to open experiment file
13. cting force Currently the maximum dwell time is 10 minutes Experimenters requiring longer dwell times should contact the manufacturer for a software modification Next to each of the Desired Value entry fields are Actual Value fields These are not user modifiable fields but rather they report back the actual experimentally acquired values after an impact The Experiment Comments Box is available to make any comments you would FIGURE 8 Experiment like to save along with the experiment In addition to you own Settings Setup Fields comments the software will automatically log the date and time of experiments in this box All experiment comments should be made after the impact Prior to each impact the comments box is cleared to run the new experiment Finally the setup frame contains the Start Experiment button When all fields are set and the animal is in position this will begin the experiment After pressing it a verify window will open to ensure you want to proceed with the experiment This is a precaution against accidentally pressing the button Experiment settings Desired Actual Force K aynesi Displacement fu Velocity mmis I Dwell Time s The Experiment Data Right Frame This frame is where all the data collected during an experiment is displayed It consists of the displacement vs time graph the force vs time graph and a chart listing the raw displacement and force values receive
14. d the experimental table can be positioned on the IH Impactor Two table guide brackets help stabilize the table m vou E It is suggested that the table be held in place with a wheel spring loaded clamp Before securing the clamp move the table forward or backward between the two table guide brackets such that the exposed spinal cord is close A to the impacting tip Exact placement of the exposed g spinal cord can be obtained by moving the secured table with the hand wheels located on the front or side of the DN dE impacting device Figure 10 These hand wheels allow pow 2 iraa the table to be moved in an X Y position The height of fes J the impacting tip can be manipulated by turning the top hand wheel Proper alignment of the impacting tip is extremely important in obtaining a reproducible impact and damage to the spinal cord DU 5 as Bs n 2 dax Vi EU i E x x 4 px Z N S CUN TN IN z BF E L FIGURE 10 Impactor with Adjustment Wheels Shown Page 12 of 20 User s Manual PSI IH Impactor It is recommended that the impacting tip be lowered to within a few mm of the exposed cord and then by viewing the location from several different angles realigning the tip It is not necessary and highly recommended that the impacting tip NOT TOUCH the exposed cord prior to the impact injury Once the proper alignment has been successfully obtained the impacting tip should be raised to approximate
15. d from the control unit Discussion and interpretation of each of these three elements can be found in the post experiment section below Conducting an Experiment This section covers a detail run of an impact experiment start to finish Selecting the appropriate impactor tip The IH Impactor is supplied with two different impacting tips The larger tip has a diameter of 2 5 mm and is designed for use with larger animals such as rats The smaller tip has a diameter of 1 25 mm and is designed for use with smaller animals such as mice Each tip has an end with screw type threads and an end that 1s tapered and smooth The threaded portion of the tip screws into the bottom of the force sensor as shown in Figure 2 When changing impactor tips it is extremely important to only HAND TIGHTEN each tip onto the force sensor It is unnecessary to use tools for this purpose since it may cause serious damage to the force sensor Tips may be removed between experiments for sterilization purposes Alternatively additional tips may be purchased from the manufacturer Depending upon the user s application one of the two different sizes of impactor tip should be threaded into the force sensor FIGURE 9 Impactor Tips Page 11 of 20 User s Manual PSI IH Impactor Selecting the appropriate experimental settings Once the appropriate tip has been threaded on and the control unit has power launch the IH Impactor software If previous impact information
16. dicate to the displacement graph above the time at which initial impact occurred The highest point corresponds to the maximum amount of force applied and should be very close to the desired value This peak will be more rounded as the tissue impacted becomes softer and more sharp as the tissue becomes harder such as bone For high force impacts the graph will auto scale the force axis to maintain readability of the graph If no impact occurs the force graph will read zero or very close to it depending on background noise It 1s important not to jostle the tip too much before an impact so as to minimize the amount of oscillation in the force sensor and reduce background noise Page 15 of 20 User s Manual PSI IH Impactor Raw Data Values Position Force Position Force 0 0 102 112 1 3 104 g4 Ai 7 106 62 A T 106 253 7 g 104 0 11 7 100 0 16 5 g5 0 Value t toms ion a aq Om 75 1 34 0 B8 7 n lue Where tip begins p i to urn arourjd 43 0 54 11 43 54 E 43 0 95 3 Ad i 56 0 Ad s 59 0 46 J 58 48 7 59 51 5 57 5d 5 55 0 58 A 52 0 63 3 47 0 B7 0 42 0 ves 0 36 0 76 0 30 i 79 0 25 F 82 0 20 5 Bd 0 pu 6 85 0 15 G BB Ja 4 B7 12 13 5 B7 30 fa 2 55 40 14 0 B 56 13 ga 74 T3 0 95 an Ta 0 ga 11 10 0 Down Stroke Up Stroke FIGURE 14 Raw Data Values Experimental Comments Also located in the experiment data frame 1s a chart consisting of the raw data values received from the control unit Figure 14 Thes
17. e are listed with the down stroke values on the left and the up stroke values on the right The first point on the down stroke side corresponds to the starting point of the impactor tip The first point on the up stroke side corresponds to the point where the tip begins to reverse direction The forces are the real force values in kilodynes read by the force sensor To find the displacement from the raw values first find the position value which is the largest from either side of the chart This value is typically on the Up Stroke side On the chart in Figure 14 this value is 106 Multiply the raw position value by 17 6 m Next pick the point where you want to know the displacement To determine displacement into the tissue pick the displacement value corresponding to the first point where the force value is greater than 20 kdyn On the chart in Figure 14 this value is 87 Multiply this position value by 17 6 m then subtract it from the previously calculated value This is the calculated tissue displacement and will correspond to the point on the displacement graph where the horizontal red line was struck for this example This calculated displacement is relative to the deepest point of impact rather than relative to the starting position of the armature Following completion of the injury cycle the impactor tip can be raised with the vertical adjustment wheel and the experimental table removed from the guide brackets After visu
18. firmware Click Yes when ready The upgrade typically takes a minute to load During this time the power must stay on to the control until and the serial cable from the computer to the control unit must remain plugged in Any disruption will result in an incomplete copy and the process must be started again Care and Cleaning of the IH Impactor The IH Impactor should be kept clean Cleaning should be done with a damp lint free cloth Do not use an excessively damp cloth allowing liquid to drip onto the stepping motor or the position sensor It is suggested that a light weight plastic cover be used to protect the instrument from dust and dirt when not in use The encoder strip that is used in the position sensor should not be cleaned or dismantled at any time during the cleaning process since any disruption of the fine markings on this plastic strip will interfere with the precision of the stepping motor and positioning of the rack Once a year depending upon the usage a light weight silicon grease should be applied to the worm drives and gears utilized in the stage movement The Adson forceps should be removed from the adjustable armature and cleaned with a mild surgical cleaning solution Care must be taken to avoid bending the delicate tips of the forceps It is recommended that the forceps be removed from the instrument when not in use and placed in a safe location Additional forceps may be purchased from the manufacturer Page 18
19. generated with the new software as well as past software releases Printing Experiment Data To print experiment data directly from the software click on File gt Print This will print the experiment data right side frame To better control the print use File gt Print Setup and to preview the results before printing use File gt Print Preview A Print Preview is recommended before each print to ensure proper alignment on the page Copying Enlarging Graphs eee ee File Edi screen to be read with clarity each graph Displacement vs Time may be opened in its own window To do Disp microns i 7 s this click on the View menu and click on zm either Displacement Graph or Force 2400 Graph This will display each graph in its 2000 own scaleable window Figure 15 To enlarge or shrink the window click and hold the left mouse button on the edge of the window and drag it to the desired size From these individual windows the graphs may also be copied out to be pasted into another program WordPerfect MS Word MS Paint or some other graphics program for 012345572828101112121415161718192021222324252827282930 Time ms example To do this resize the window to the desired size of the image when copied then click the Edit menu and then Copy FIGURE 15 Displacement Graph Window You may then use Edit gt Paste to paste it back into the desired program Page 17 of 20 User s Manual PSI IH Impactor Serial Port
20. ion If the pressure bearing is seated properly the ball joint can be secured into place by tightening the screw Armature housing If the ball joint does not appear to work properly after reassembly remove the tightening screw retaining ring and pressure bearing and realign the beveled portion of the pressure clamps and reassemble Figure 16 shows the retaining clamps in the proper position as seen through the top of the armature housing with the retaining ring and ur pressure bearing removed Note that the beveled portion of ho A each retaining clamp faces the top of the armature housing This 1s 1mportant for the proper seating of the pressure b bearing during re assembly of the unit Retaining clamps in correct position FIGURE 16 Armature Housing Page 19 of 20 User s Manual PSI IH Impactor Limited Warranty What the Warranty Covers We warrant the IH Impactor to be free from defects in material and workmanship for 90 days after shipment Our obligation is to repair or replace our product if it should prove to be defective within 90 days of shipment This warranty is void if the product 1s a handled carelessly including but not limited to failure to Observe proper electro static discharge precautions b operated in excess of specified electrical or environmental limits or c improperly calibrated by the user or a user appointed third party Note that we do not guarantee product suitability for all
21. ly 4 5 mm above the exposed cord The impacting tip attached to the rack can move a total distance of 8 mm Be careful to ensure that the encoder strip 1s still located within the position sensor with a portion crossing the midline of the sensor If the encoder strip is not in the position sensor or a portion of it does not begin in the middle of the sensor incorrect displacement values will be reported Initiation of the injury Click the Start Experiment button found in the setup frame to initiate the injury sequence Before an impact is made the instrument will self calibrate This is seen by a little twitch in the impacting arm as it moves up and then back to the orginal starting position The confirmation window will also appear If all of the experimental conditions are properly set 1 e alignment of xj impacting tip amount of force to F applied to exposed spinal cord and dwell time defined click the Yes button The stepping motor 2 alice rae PRIME will immediately activate and the rack will move the impacting tip onto the exposed spinal cord The impacting tip will then retract to the start position after the desired dwell time immediately if dwell ies vw is set to zero Displaying and Interpreting Experiment Data On completion of the injury cycle the data gathered by the control unit will be sent to the software which will update the actual values in the Experiment Settings portion of the setup frame
22. ly engages the AC power connector on the back of the control unit Use the power toggle switch again to supply power to the control unit If the power light still does not glow green call technical support Once the power indicator light on the front of the control unit glows green launch the IH Impactor software by double clicking on the icon now located on the computer desktop Pol Spinal Impactar Page 9 of 20 User s Manual PSI IH Impactor E au IH 5pinal Cord Impactor ioj xl File Edit wiew Help Deel eela Experiment Mlode Force C Displacement Experiment Settings Desired Actual Force K dynes Hoo 0 Displacement fui 1 0 Displacementys Time mE ENT Position Force Position Force SECC ECE CEC CECE EELLELEE Velocity mms 1 Oo RERSEREERPAESISRESERRRRRERS SMS NEN Dwell Time o o Force vs Time i Experiment Comments sHH5BBaHHHzHHEBBaHRHSHHEHHs start Experiment Ready Mm z Figure 7 The PSI IH Spinal Cord Impactor software This is the initial screen from which the experiments will be setup and displayed The IH Impactor software is composed of two main frames The left frame is for setting up all the experiment variables storing comments and running the experiment The right frame contains all the post experiment data displayed as a force graph a displacement graph and a chart of the raw values from the control unit The Setup
23. of 20 User s Manual PSI IH Impactor Tightening screw Retaining gt Retaining ring EHI Y d Armature housing FIGURE 15 Assembled and Disassembled Support Arm The adjustable ball and socket armature may be disassembled after extensive use for cleaning To disassemble the ball joint unscrew the spring loaded tightening screw immediately below the ball joint that 1s to be cleaned This will release the pressure on the ball joint and allow the retaining ring to be removed With the retaining ring and spring loaded tightening screw removed the pressure bearing and two pressure clamps can be removed from the armature housing The ball joint can be cleaned with 70 alcohol and a soft lint free cloth Care should be taken to remove all dirt from the ball Joint and to visually inspect the area for any foreign material that may harm the ball joint surface To reassemble the flex ball joint first place the pressure clamps into the armature housing It is extremely important that the small beveled portion of the clamps be visible from the top of the armature opening as shown in Figure 16 The pressure bearing can then be seated on top of these clamps The clamps should be separated enough to accommodate the cone shaped portion of the pressure bearing The ball joint is placed on top of the pressure bearing and the retaining ring is used to secure the ball joint in place Finally the spring loaded tightening screw is placed into posit
24. of Impactor Assembly with Cables Connected Installing IH Impactor Software Computer and monitor 486 66 or higher PC Pentium recommended with at least 64 MB RAM a hard disk with 8 MB of free disk space a double speed CD ROM drive 4 speed recommended and a video board and monitor capable of running 256 color The system should be running Windows 98 2000 XP or NT 4 0 The software that enables the user to control the movement of the impactor rack by the stepping motor is contained on the CD Insert the IH Impactor CD ROM From the Start menu choose RUN and then Browse to open the Install program on the IH Impactor CD ROM Following the onscreen instruction of the self extracting file Once the program installation is complete the shortcut icon will appear on the desk top PSl Spinal Impactor Page 8 of 20 User s Manual PSI IH Impactor Running the IH Impactor Software Before launching the IH Impactor software program turn on the power to the control unit with the power toggle switch on the back of the control unit Power Power Toggle Switch le A power indicator light on the front of the control unit will glow green indicating that sufficient power has been supplied to the control unit If the power indicator light does not come on turn the unit off and check to be sure the control unit is plugged into an appropriate socket of the power strip Also make sure the other end of the power cord complete
25. ol unit have been mechanically and electrically checked If the shipping container or cushion material is damaged notify the carrier as well as PSI Save the shipping material for the carrier s inspection Page 2 of 20 User s Manual PSI IH Impactor 1 Impactor will be packed similar to the picture shown to the left The impactor itself will be wrapped and packed in foam The accessories are packaged in the accompanying boxes backup foam i and surgical plate boxes wedge foam 2 To unpack first remove the accessory boxes and foam padding Page 3 of 20 User s Manual PSI IH Impactor 3 Remove the Impactor from the shipping box and set aside Remove all the packing material and wrapping 4 Finally remove the control unit from its box It will be wrapped in bubble wrap as shown Remove the padding for setup Page 4 of 20 User s Manual PSI IH Impactor Setting Up the PSI IH Impactor 2002 You should have the following items 1 Impactor with force position and motor cables 1 each 2 Control unit 1 each 3 AC power cable for control unit 1 each 4 RS232 Din15 computer interface cable serial cable 1 each 5 Experimental table with attached support arms and flexible ball joints 1 each 6 Adson spinal cord stabilizing forceps 2 each 7 User software CD 1 each 8 Impactor tip rat 1 each 9 Impactor tip mouse 1 each 10 User Manual This Document 1 e
26. re also the point where the tip begins to retract The point where the tip starts Oms is shown as the highest displacement This is the distance down the tip traveled during the impact The graph is inverted like this to correspond with the physical motion of the tip as an impact occurs Two red lines are also struck on the graph The vertical red line represents the time at which the tip impacted tissue The horizontal red line indicates the displacement of the tip into the tissue To summarize the graph is read in a manner to correspond with the motion of the tip as it travels down from and back to its starting position The lowest point on the graph will always be aligned to zero microns and the rest of the points measured relative to this zero reference point The horizontal red line indicates where along the path of the tip tissue was encountered and reads how far into the tissue the tip penetrated The graph is discontinuous at the point where the desired force is achieved as the impactor tip cannot be instantaneously stopped The second half or right half of the graph shows the motion of the impactor tip after the desired force 1s achieved It can be seen that the tip actually moves a bit further into the tissue before the motor is able to overcome its inertia and move it back out In an experiment where the dwell time is greater than zero the nght half of the curve will not be displayed as it is far out of the range of the graph s time scale
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