LSI System II User manual

LSI System II
Interferential with Russian Stimulation
Owner’s Manual
KC Metro Area: 913-894-4493
Toll Free: 800-832-0053 • Fax: [phone]
lsiinternational.com
Rev.B OM001 Updated 06/2012
LSI International, a division of Medical Outfitters, LLC
640 Miami Ave
Kansas City, KS 66105-2140

1
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 ash. 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 1and 2in 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 specic frequency. As as example, to set 50 Hz, rst set Frequency
Selection at the 1-15 Hz range, then press up the keypad to increase frequency to 50 Hz.
SET
PREMOD
SWEEP START STOP
SWEEP START STOP
SET
TIMER
FREQUENCY
VECTOR
3-5 Hz
1-15 Hz
80-120 Hz
12
mA mA
1-150Hz
2500 Hz
4000 Hz
10/10 10/50
B
AGL
M
OP
Q
KJ
I
H
E
DF
C
N
SYSTEM II
INTERFERENTIAL
REMOTE
STOP
1 2
S
R
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-
B-
C-
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).
FREQUENCY SELECTION: Use the frequency range of your choice. Frequency readout will show
top of range selected prior to activation of SWEEP mode.
FREQUENCY ADJUST: Use to set a specific frequency.. 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.
8
Features
Control Panel

2
D - PREMOD: When off (no light), channel 1 will operate at an uninterrupted 4000Hz and channel 2will
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 1and 2.
K - STOP: Stops timer and output to channels 1and 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
1and 2.
N - 2500HZ MODE: Automatically activates 50Hz premodulated setting typically used for Russian Stimu-
lation and muscle spasm reduction. When using the 2500Hz setting, SWEEP and VECTOR controls will
be in the off position. For simplication, 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 1and 2will alternately drop 20% from their preset output and
return to the preset gure.
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 1and 2.
***Complete operating instructions with examples are reviewed in the Instructional Video (CD-ROM) provided with your unit.***

3
Special Programming Options
The LSI System II allows for several special 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 ashing mode. Use down arrow on frequency to lower readout 70Hz, then
push the set control again.
d. 10 will now ash 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 signies 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, increase 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 ash.
e. Press SET again to accept the 80 Hz setting.
f. The 10 will now ash 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 rst 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 ash.
j. Press SET to accept the 3Hz, 10 will now ash 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 rst treatment (80 – 120Hz for
6 minutes) has been completed, the second treatment (3 – 5Hz for 6 minutes) will automatically begin.
***Complete operating instructions with examples are reviewed in the Instructional Video (CD-ROM) provided with your unit.***

CAUTION
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 ow 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 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 inamma-
tion, circulatory insufciency 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 veried 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.
4

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. Hold 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 1and channel 2output.
b. Plug lead wire into either channel 1or 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 uctuation would indicate a broken wire making
intermittent contact.) If the readout is less than 9 or if it uctuates, 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 using 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 indenite use. If you
notice uctuating delivery of current to the patient, poor adhesiveness or difculty in getting the amplitude of
your unit high enough, discard the electrodes and use a new package.
5

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 intensied at the site of the best conduction, the water pools,
with little or no current ow elsewhere. Conductive gels may be used, however, they tend to create a glaze
over the electrode surface after long term use which may interfere with current ow. 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 ash off and on, you have encountered resistance too high
for normal operation of the unit. While the output is ashing, 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 light 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.
6

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 nish of the unit and /or the efciency 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: [phone]
Website: lsiinternational.com
7

Introduction
Principles of Interferential Therapy
Interferential therapy was rst developed by Dr. Hans 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 g. 1)
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.
8
Interferential therapy was first developed by Dr. Hans 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)
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 pro-
ducing interferential current through either of these methods.
1
50 K
20K
10K
5K
2K
1K
500
200
100
50
20
10
1 5 10 20 30 50 100 500 1K 5K 10K 50K 100K 500K
Introduction
Principles of Interferential Therapy
Frequency – (Hz)
Impedance as a function of frequency
Fig. 1
Series Equivalent Resistance (ohms)

9
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, cycles 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).
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.
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.
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
interferential currents.
Frequency is synonymous with pulses per second,cycles per second and hertz. In an alternating current
(AC) there is both a posititve 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).
Carrier frequency is the number of cycles per second a generator produces. Most interferential units,
including the LSI System II, operate at a carrier frequency of 4000Hz.
Burst frequency or Pre-modulationis 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.
2
1 sec. (1HZ)
1 sec. (4000HZ)
1 sec.
1 sec. (4HZ)
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
interferential currents.
Frequency is synonymous with pulses per second,cycles per second and hertz. In an alternating current
(AC) there is both a posititve 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).
Carrier frequency is the number of cycles per second a generator produces. Most interferential units,
including the LSI System II, operate at a carrier frequency of 4000Hz.
Burst frequency or Pre-modulationis 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.
2
1 sec. (1HZ)
1 sec. (4000HZ)
1 sec.
1 sec. (4HZ)
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
interferential currents.
Frequency is synonymous with pulses per second,cycles per second and hertz. In an alternating current
(AC) there is both a posititve 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).
Carrier frequency is the number of cycles per second a generator produces. Most interferential units,
including the LSI System II, operate at a carrier frequency of 4000Hz.
Burst frequency or Pre-modulationis 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.
2
1 sec. (1HZ)
1 sec. (4000HZ)
1 sec.
1 sec. (4HZ)