LSI System II Manual
Contents
1. Nemec of Vienna Austria in the early 1950s Its use has grown dramatically since its introduction in the United States in the 1970s Three prerequisites are necessary for interferential current therapy a medium frequency current 1000 to 10 000 Hz b two independent current generators and c alternating current By crossing two currents within the tissue they interfere with each other and form a beat frequency in the deeper tissue It has been established that by increasing the frequency of any alternating current the skin resistance measured in ohms is reduced see fig 1 Fig 1 Series Equivalent Resistance ohms 1 5 10 20 30 50 100 500 1K 5K 10K 50K 100K 500K Frequency Hz Impedance as a function of frequency Burton and Maurer 1974 Pain Suppression by Transcutaneous Electronic Stimulation IEEE Transaction on Biomedical Engineering Interferential current therapy may be produced by two different methods They are commonly referred to as the Frequency Difference method and the Premodulated method The LSI System II unit is capable of producing interferential current through either of these methods 39 66 It is necessary to have a working knowledge of terms such as frequency carrier frequency burst frequency and premodulation in order to understand Frequency Difference and Premodulated interfer ential currents Frequency is synonymous with pulses per second cycle2. amplitude modulation of Output 1 and 2 from 20 to preset intensity over an eight second period Frequency Adjust provides selectable output frequency of 4000 4250Hz Digital countdown from 1 98 minutes with interrupt and reset capability Stimulation output is inhibited each time the STOP key is actuated Output is automatically reset to 0 each time the patient remote stop is depressed or when the timer counts down to no time remaining Patient cables to line less than 10 uA 1 Red 6 DIN to two 080 pin leadwires 1 Black 6 DIN to two 080 pin leadwires 6 packages of 2 x 2 LSI Silver Tab Repositionable Electrodes 6 packages of 2 x 4 LSI Silver Tab Repositionable Electrodes 1 line cord 2 remote stop 1 operator manual 1 pad placement 1 quick reference guide 1 training video 13 Warranty LSI International Company warrants that the LSI System II Interferential Unit Product is free of defects in material and workmanship This warranty shall remain in effect for two 2 years from the date of original purchase of this Product Accessories that are included as standard with the product as listed in the user s manual are warranted for 90 days If this Product fails to function during the warranty period because of defect in material or workmanship Company will at its discretion replace or repair this Product without charge within a period of 30 days from the date on which the defective Pr
3. use of LSI Silver Tab Electrodes included with your unit 12 Electrical stimulation is contraindicated in the case of malignant tumors cancerous lesions acute or severe inflamma tion circulatory insufficiency or the danger of hemorrhage 13 Do not use simultaneously in the same treatment area with cold packs or heat therapy either wet or dry 14 Keep this device out of the reach of children 15 Do not use in general area where high powered frequency transmitting units are being operated 16 Shortwave diathermy should not be turned on or used at the same time as it may interfere with the proper operation of the LSI System II Interferential 17 Do not use the same power outlet or line with whirlpool traction machines and any other heavy electrical machines or motors 18 This unit requires a grounded outlet If you have any doubts as to the quality of the electrical wiring in your clinic please have it checked and verified by a professional NOTE In order to ensure proper and safe operation of your LSI unit it is absolutely necessary that only LSI DIN PIN leadwires like those supplied with this unit be used IMPORTANT The most common operational problems associated with electrotherapy devices center around the lead wires and electrodes Please read the following information concerning these components Electrode and Lead Wire Test Mode To test for defective lead wires and or electrodes follow this procedure a Ho
4. LSI System II Interferential with Russian Stimulation Owner s Manual _ pe m e T N SS AAE n b 4 a e n g E AL INTERNATION KC Metro Area 913 894 4493 Toll Free 800 832 0053 Fax 866 216 2541 Isiinternational com LSI International a division of Medical Outfitters LLC 640 Miami Ave Kansas City KS 66105 2140 Rev B OM001 Updated 06 2012 Control Panel A G L A FREQUENCY TIMER a 3 5 Hz an 1 150Hz H aa 1 15 Hz P 2500 Hz M 80 120 HZ M 4000 Hz C SWEEP START O 10 10 10 50 T SWEEP START STOP VECTOR REMOTE n bi SYSTEM II A INTERFERENTIAL S Features The LSI System II contains a current test feature which senses the quality of the electrode contact If your electrodes are making poor contact with the tissue the unit will emit a beeping tone and the LEDs on the mA output will drop to 0 and flash If this occurs recheck your electrodes and lead wires to ensure proper contact and again increase intensity with the intensity keypads A FREQUENCY READOUT Indicates frequency at which the unit is set Will read actual burst frequency when in PREMOD mode and will read difference between channel 1 and 2 in frequency difference mode PREMOD light off B FREQUENCY SELECTION Use the frequency range of your choice Frequency readout will show top of range selected prior to activation of SWEEP mode C FREQUENCY ADJUST Use to set a specific frequ
5. TION 1 Never turn the unit on or off by means of the on off toggle switch located on the back of the unit while a patient is at tached to the unit via the lead wires and electrodes 2 Never operate unit during lightening thunderstorms or any condition that could have an adverse effect on continuity of power flow to the unit 3 Never operate unit in close proximity to any type of diathermy device 4 Federal law restricts this device to the use or sale to a physician or other practitioner in the state or province in which said person is licensed and practices 5 Do not use this device when treating electrically susceptible patients such as those with pacemakers etc 6 Use extreme caution when treating areas of impaired sensory response or patients unable to report discomfort and pain 7 Do not apply electrodes transthoracically in the vicinity of the eyes carotid sinus nerves or transcerebrally 8 This device is not recommended for patients who are pregnant or who suffer from heart disease 9 This device should not be used to relieve chronic pain until etiology has been established 10 Application of electrical stimulation can produce irritations at the stimulation site This may be caused by the elec trodes or other media in contact with the skin Determine the cause of the irritation and replace the item as necessary 11 Electrical stimulation should only be applied with an effective coupling medium LSI recommends the
6. ase mA output to desired contraction then push 10 10 to begin on and off sequence 3 To program two treatments back to back Some clinicians have desired to treat the same area with two different frequencies one treatment following the other without resetting the unit As an example you may want to treat at 80 120Hz for 6 minutes followed by 3 5 Hz for another 6 minutes This can be accomplished as follows a Select PREMOD and or SWEEP functions b Select 1st treatment range i e 80 120Hz c Press SET in frequency adjustment section to accept 120 d The 120 will change to 80 and flash e Press SET again to accept the 80 Hz setting f The 10 will now flash in the timer selection To lower the time to 6 minutes use the down arrow until 6 appears g Press SET again in frequency adjustment section The first treatment of 80 120Hz for 6 minutes has now been entered h Now press the 3 5Hz setting i Press SET to accept the 5Hz 3 will now flash j Press SET to accept the 3Hz 10 will now flash in the timer section k Push the down arrow under the timer to lower the time to 6 minutes l Press SET again in the frequency adjustment section to enter the 6 minute treatment time Both treatments have now been stored m Press START and increase the intensity to patient comfort After the first treatment 80 120Hz for 6 minutes has been completed the second treatment 3 5Hz for 6 minutes will automatically begin CAU
7. cial programming options 1 To create a frequency range Example 70 to 100Hz a Select 80 120Hz range b Use down arrow on frequency adjust to lower readout to 100Hz then push SET control in frequency section c 80Hz will now appear in a flashing mode Use down arrow on frequency to lower readout 70Hz then push the set control again d 10 will now flash in the timer section You can either change the timer with the arrows under the timer SET control or leave the timer at 10 To set the time selected again push the SET control in the frequency section When SWEEP and START are activated the frequency will sweep between 70 and 100Hz Any range 1Hz to 250Hz can be established 2 To change on and off times and ramp times under the 10 10 and 10 50 controls a Select 2500Hz This will automatically activate the 50Hz premodulated settings The following example uses the 10 10 control The procedure is the same for 10 50 b While in the STOP mode push 10 10 key 10 and 10 will appear above the mA This signifies 10 seconds on left LED and 10 seconds off right LED On and off times can be changed by pressing up or down arrows When new on and off times are selected press 10 10 key again Now ramp times are displayed with ramp up on the left LED and ramp down on the right LED These can be changed in 5 second increments by using up or down arrows Push the 10 10 key again The new times are now programmed in Push START incre
8. cond thus adding their respective amplitudes together for intensified stimulation Channel 1 4000Hz Channel 2 4080Hz Beat Frequency 4000Hz 4080Hz Channel 1 Beat Frequency Channel 2 10 With Frequency Difference interferential the uninterrupted frequency output from channel 1 and 2 will create Widensky Inhibition nerve block between the corresponding electrodes This is due to the fact that the large diameter sensory fibers will tend to depolarize at this higher constant frequency and block nerve conduction completely The beat frequency therefore becomes the frequency the clinician utilizes for a therapeutic result Premodulated Method With the premodulated method both output channels produce the identical carrier frequency of 4000Hz However the modulation or bursting occurs within the unit and is delivered to the tissue in a burst frequency as selected by the clinician Since both channels are synchronized and always in phase the beat frequency will be the same as the pre modulated frequency Channel 1 4000Hz Channel 2 4000Hz Beat Frequency ANN NAN AAN 4000Hz 4000Hz Channel 1 Beat Frequency Channel 2 Ke Os 11 Principle of Accommodation Both motor and sensory accommodation may easily occur when electrical stimulation is applied at a constant frequency The LSI System II Interferential unit allows the clinician the opportunity to lessen accommodation by the use of the SWEEP mode In the Premodulated mod
9. e PREMOD light on the burst frequency will sweep within the preselected range i e 3 to 5 Hz 80 to 120 Hz or 1 to 150 Hz If the operator selects a specific frequency 70 Hz as an example the sweep will be 20 plus and minus from the 70 Hz In the Frequency Difference interferential mode PREMOD light off channel 2 will sweep between the preselected range i e 4003 to 4005 Hz 4001 to 4015 Hz 4080 to 4120 Hz or 4001 to 4150 Hz Use of the Vector With the amplitude of both channels set at the same milliamps of current the interference or beat frequen cy current will be positioned between the flow of current created by each channel This is referred to as a static or stationary position The interference current will be drawn nearer to the stronger current output of either channel 1 or channel 2 In order to move or rotate the interference current within the tissue the VECTOR mode is utilized The VECTOR mode automatically changes the intensity of channel 1 and 2 alternately from their preset output Each channel will alternately drop 20 in output and then return to the preset output This effect pulls the interference or beat frequency current back and forth to effectively provide coverage of all tissue within the four electrode field Muscle Stimulation Medium frequency current pre modualted in the range of 40 to 60 Hz produces smooth comfortable asynchronous contraction in normal innervated muscle Such contractions have b
10. een utilized for edema reduction muscle spasm reduction and muscle strengthening also referred to as Russian Stimulation Edema Reduction By utilizing the 10 10 mode 10 seconds of contraction alternating with 10 seconds of rest with the cur rent intensity set to produce gentle movement of the involved joint the body s natural muscle pumping action is simulated Muscle Spasm Reduction By also utilizing the 10 10 mode with the current intensity set to produce strong contractions of the involved muscle the muscle will fatigue over a period of minutes due to the short rest time and depleting of ATP Muscle Strengthening In this procedure the 10 50 mode is used to provide 10 seconds of contraction followed by 50 seconds of rest Ramping The LSI System II Interferential has a built in ramping effect when the 10 10 or 10 50 modes are in use As the 10 second cycle begins the current will slowly ramp up over a period of 2 5 seconds to the preset inten sity As the 10 second on cycle ends the current will ramp down over a 2 second period This allows for a gentle onset and completion of contraction cycle 12 Technical Specifications Outputs Frequency Timer Safety Line Leakage Accessories Sinusoidal AC 0 200 Volts peak to peak 0 60 mA RMS Delivered current displayed for each output 4000 4250Hz continuous or burst modulated from 1 250 with a 50 duty cycle Vector Sweep provides
11. ency As as example to set 50 Hz first set Frequency Selection at the 1 15 Hz range then press up the keypad to increase frequency to 50 Hz 1 D PREMOD When off no light channel 1 will operate at an uninterrupted 4000Hz and channel 2 will operate at 4000Hz plus the frequency selected on function A Frequency Readout When on light on both channels will operate at a carrier frequency of 4000Hz and both channels will be synchronized to deliver the frequency as shown in function A E SWEEP Frequency will sweep between the range indicated in function B Frequency Selection Press key pad to activate light and this function F SET This key is used for a special programming option Please refer to page 10 G TIMER Indicates treatment time remaining H TIMER SET Set key automatically enters 10 minutes to timer I TIME ADJUST By pressing the up or down key the treatment time may be raised or lowered from the 10 minutes which is set automatically J START Activates timer and outputs to channels 1 and 2 K STOP Stops timer and output to channels 1 and 2 L MILLIAMPS OUTPUT Indicates the output measured in milliamps which is actually being delivered to the tissue M CURRENT OUTPUT CONTROLS Keypads will increase or decrease the delivered current to channels 1 and 2 N 2500HZ MODE Automatically activates 50Hz premodulated setting typically used for Russian Stimu lation and muscle spasm reduction When usi
12. ight must be off in order to increase intensity No power to unit no lights no sound 1 Check to see if cord is plugged securely into the wall and the back of the unit Unit is locked up and cannot be programmed 1 Unit is malfunctioning and needs to be returned to or unit shuts down during treatment LSI for repair Unit will not go into Start mode when START 1 Check to see if there is time entered in the button is pressed TIMER LED Maintenance Maintenance of the LSI System II Interferential is limited to the periodic cleaning of the unit and patient applied accessories with a damp cloth or sponge and a solution of mild soap and water Any other cleaning solution may potentially damage the finish of the unit and or the efficiency of the leads and electrodes If the LSI System II Interferential unit does not seem to be operating properly check the line cord turn the unit on and check for proper operation Check the lead wires by utilizing the electrode test function The LSI System II Interferential contains no user repairable parts Servicing and repair should be referred to authorized service personnel only For servicing information contact LSI International Service Department 640 Miami Ave Kansas City KS 66105 Local 913 894 4493 Toll free 800 832 0053 Fax 866 216 2541 Website Isiinternational com Introduction Principles of Interferential Therapy Interferential therapy was first developed by Dr Hans
13. ld down the STOP key for 5 seconds until all 8s appear in the Frequency section 10 appears above Time and 01 appears in both channel 1 and channel 2 output b Plug lead wire into either channel 1 or channel 2 c Hold the two lead wire pins together and observe the readout in the output LEDs above If the readout is 9 or 10 the lead wire is good For further assurance stress the wire back and forth at the pin and also at the end where it enters the unit The readout should stay at 9 or 10 A fluctuation would indicate a broken wire making intermittent contact If the readout is less than 9 or if it fluctuates replace the lead wire d To test electrodes insert one lead wire pin into an electrode Touch the other pin to the conductive side of the electrode and observe the output LED If the output reads 9 or 10 the electrode is good A reading of 8 or less indicates a defective electrode which should be replaced e For proper performance use non expired LSI International Silver Tab Repositionable Electrodes Reorder numbers LSI2204 2 x 2 and LSI2404 2 x 4 f If using carbon rubber electrodes use only electrotherapy conductive gel Do not use topical analgysics ultrasound medium gel or other products Self Adhesive Electrodes It is recognized that there are many brands types and styles of electrodes available We recommend only using the repositionable LSI Silver Tab self adhesive electrodes We do not recommend usi
14. ng foilbacked electrodes or any kind of expired electrodes The metal foil can cause changes in the waveform To ensure maximum life of your electrodes the skin should always be cleaned before applying the electrode This can be accomplished by stripping with tape cleansing with soap and water or by using an alcohol wipe Electrodes must also be replaced into the resealable package after use This will keep them from drying out and losing their adhesive and conduc tive properties Additional life may be added to the electrode by the use of Electro Mist spray A small amount on the electrode before replacing it in the package may reintroduce some adhesiveness and conductivity Remember however they are disposable electrodes and are not intended for indefinite use If you notice fluctuating delivery of current to the patient poor adhesiveness or difficulty in getting the amplitude of your unit high enough discard the electrodes and use a new package Carbon Rubber Electrodes It is recommended that water soaked sponges always be used between the electrode and the tissue to ensure uniform contact and even disbursement of the current over the entire surface area of the electrode If water only is used as a conductive agent no sponge pooling may occur with resulting dry spots under the electrode The current then will become intensified at the site of the best conduction the water pools with little or no current flow elsewhere Conductive gel
15. ng the 2500Hz setting SWEEP and VECTOR controls will be in the off position For simplification these features are programmed in a locked off mode O 10 10 MODE Activates the 10 second on and 10 second off function When activated the off portion of the cycle will precede the on portion Automatic ramping of 2 5 seconds up and 2 0 seconds down is provided P 10 50 MODE Activates the 10 second on and 50 second off function When activated the off portion of the cycle will precede the on portion Automatic ramping of 2 5 seconds up and 2 0 seconds down is provided Q VECTOR When activated channel 1 and 2 will alternately drop 20 from their preset output and return to the preset figure Notes Concerning Functions M N O and P As a safety feature output cannot be changed while the 10 10 or 10 50 functions are in the off cycle or when the VECTOR light is on Also since there is no reason to utilize the VECTOR while the 10 10 or 10 50 functions are in use the unit will not allow dual activation R REMOTE STOP Depressing the button on the remote control will stop all output of the unit A repeating tone will sound signaling the operator that the patient has activated the switch S OUTPUT JACKS Output jacks for channel 1 and 2 Complete operating instructions with examples are reviewed in the Instructional Video CD ROM provided with your unit 2 Special Programming Options The LSI System II allows for several spe
16. ny defect in or use of the Product Any legal action brought by the buyer relating to this warranty must be commenced within one year from the date any claim arises and must be brought only in the state or federal courts located in Wyandotte County KS Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages so the above limitations or exclusions may not apply to the buyer This warranty gives the buyer specific legal rights and the buyer may also have other rights which vary from state to state For Warranty Service Please keep original packing supplies and box to be used for returns warranty service or equipment repairs or you may be charged additional fees Liability under this warranty covers servicing of the unit returned to the factory To implement the warranty first notify LSI International concerning suspected defects Then if so instructed ship the unit to LSI International by normal UPS delivery For authorization to return your unit or to inquire about possible malfunctions call LSI International at 913 894 4493 or 1 800 832 0053 14 Do not send your unit to the factory without first securing an authorization number Serial Number __ Sold To Date Sold This warranty is non transferable 15
17. oduct is returned to the Company All repairs must be performed by LSI International Any modifications or repairs performed by unauthorized centers or groups will void this warranty Rental units are avail able to prevent down time during repairs Shipping charges to LSI International under this warranty must be paid for by the buyer of the product Company will ship the replacement or the repaired Product to the consumer s facility This Warranty Does Not Cover 1 Replacement parts or labor furnished by anyone other than the Company 2 Defects or damage caused by labor furnished by someone other than Company 3 Any malfunction or failure in the Product while it is in the possession of the owner during the warranty period if the malfunction or failure is not caused by a defect in material or workmanship or if the malfunction or failure is caused by unreasonable use including the failure to provide reasonable and necessary maintenance Alteration misuse or neglect of the Product voids this warranty Except as specifically set forth above LSI Interna tional makes no warranties express or implied including without limitation any implied warranty of merchantability or fitness for a particular purpose with respect to the Product If any implied warranties apply as a matter of law there are limited in duration of one year LSI International shall not be liable for any indirect special consequential or incidental damages resulting from a
18. s may be used however they tend to create a glaze over the electrode surface after long term use which may interfere with current flow Cleaning with a mild soap and water with a soft brush will remove the glaze It is not a good practice to use conductive mist sprays as they will not ensure a uniform contact between electrode and tissue and most sprays contain a saline solution which will destroy the carbon and render the electrode useless High Resistance Indicator The LSI System II is designed to indicate when excessive resistance high ohms reading is present This is normally due to using sponges which are only damp rather than wet or using an electrode which is conducting poorly If while increasing the intensity by pressing the up arrow the output stops at a reading of less than 60mA and the readout begins to flash off and on you have encountered resistance too high for normal operation of the unit While the output is flashing the Frequency LEDs will indicate the actual resistance in ohms If this occurs check for dry sponges too little pressure on the sponge and electrode or defective electrodes and or lead wires Troubleshooting Unit goes into fail mode MAs blinking 00 1 Check electrodes and leadwires Alarm sounding 2 Electrodes must be attached to the patient in order for the MAs to increase Unable to increase intensity 1 Check programming procedure by viewing training tape and reviewing Owner s Manual 2 Vector l
19. s per second and hertz In an alternating current AC there is both a positive and a negative component which together form one cycle The number of these cycles produced in one second therefore determine the frequency or hertz or pulses per second or cycles per second Ne UU I 1 sec 1HZ gt I lt t 1 sec 4HZ Carrier frequency is the number of cycles per second a generator produces Most interferential units including the LSI System IV operate at a carrier frequency of 4000Hz lt 1sec 4000HZ Burst frequency or Pre modulation is the act of taking the carrier frequency and bursting it into a predetermined number of bursts or packages per second without changing the carrier frequency In the above example the carrier frequency of 4000Hz has been burst or pre modulated into 4Hz with each burst still containing the carrier frequency at the rate of 4000Hz By maintaining the carrier of 4000Hz the advantage of reduced tissue resistance to the current is preserved Frequency Difference Method With this method both channels produce uninterrupted medium frequency current but of a slightly different frequency As an example channel 1 produces 4000Hz and channel 2 produces 4080Hz The difference between the two frequencies produces a beat frequency of 80Hz the difference between the two channels This beat frequency is created because the two channels will be in phase 80 times per se
Download Pdf Manuals
Related Search