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Instruction Manual
Interferential Therapy
Distributed by Empi, Inc.
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Thank you for choosing Empi Axon which provides an interferential therapy
to treat conditions where inflammation is a problem such as Back Pain,
Osteoarthritis, Rheumatoid Arthritis, Muscular Pain / Strain, and Sports
injuries. Axon produces the low frequency current treatment that uses two
medium frequency currents, which “interfere” with each other to produce a
beat frequency that the body recognizes as a low frequency energy source.
The rationale is to overcome the problems caused by low-frequency currents,
while maintaining their penetration deep into the affected tissue.
The actual stimulation is produced by crossing two alternating currents with
medium frequencies simultaneously to a targeted body region. As a result,
these two currents will superimpose to form a new low frequency current
deep within the tissue.
Empi Axon includes:
• 1 x Axon Device
• 2 x Lead Wire
• 4 x Electrodes
• 4 x Battery
• 1x Adaptor
• 1 x AC Plug
• 1 x Belt Clip
• 1 x Instruction Manual
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Axon
Instruction Manual
Table of Contents
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Operation Keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
LCD Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Treatment Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Placement of Electrodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Battery Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Important Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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Axon
Instruction Manual
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Attention: Read the Manual before using the device.
Safety Information
Contraindications
1. Any electrode placement that applies current to the carotid sinus (neck)
region.
2. Any use of TENS on patients who have a cardiac pacemaker, implanted
defibrillator, or other implanted metallic or electronic device, because this may
cause electric shock, burns, electrical interference, or death.
3. Any electrode placement that causes current to flow transcerebrally
(through the head).
4. The use of TENS whenever pain syndromes are undiagnosed, until
etiology is established.
Warnings
1. The safety of TENS devices for use during pregnancy or birth has not been
established.
2. TENS is not effective for pain of central origin (This includes headache).
3. TENS devices should be used only under the continued supervision of a
physician.
4. It is recommended that patients consult with their physician before using this
device, because the device may cause lethal rhythm disturbances to the heart in
susceptible individuals.
5. TENS devices have no curative value.
6. TENS is a symptomatic treatment and as such suppresses the sensation of pain
which would otherwise serve as a protective mechanism.
7. The user must keep this device out of the reach of children.
8. Electronic monitoring equipment (such as ECG monitors and ECG alarms may
not operate properly when TENS stimulation is in use.
9. Stimulation should not be applied across the patient’s chest, because the
introduction of electrical current into the chest may cause rhythm disturbances to
the patient’s heart, which could be lethal.
10. Stimulation should not be applied over open wounds or over swollen, infected or
inamed areas or skin eruptions (e.g., phlebitis, thrombophlebitis, varicose veins).
Apply stimulation only to normal, intact, clean skin.
11. Stimulation should not be applied over, or in proximity to, cancerous lesions.
12. Stimulation should not be applied when the patient is in the bath or shower.
13. Stimulation should not be applied while the patient is sleeping.
14. Stimulation should not be applied while the patient is driving, operating
machinery, or during any activity in which electrical stimulation can put the
patient at risk of injury.
15. Device might get warm for prolonged use. Do not place it in close contact with
skin while operating.
Attention: Read the Manual before using the device.
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Instruction Manual
Precautions
1. Isolated cases of skin irritation may occur at the site of electrode
placement following long term application.
2. Effectiveness is highly dependent upon patient selection by a person qualied in
the management of pain patients.
3. TENS is not a substitute for pain medications and other pain management
therapies.
4. The long-term effects of electrical stimulation are unknown.
5. Patients with suspected or diagnosed heart disease should follow
precautions recommended by their physicians.
6. Patients with suspected or diagnosed epilepsy should follow precautions
recommended by their physicians.
7. Caution should be exercised when the patient has a tendency to bleed
internally, such as following an injury or fracture.
8. Caution should be exercised following recent surgical procedures when
stimulation may disrupt the patient’s healing process.
9. Caution should be exercised when stimulating over areas of skin that lack
normal sensation.
10. Use this device only with the leads, electrodes, and accessories
recommended by the manufacturer.
Adverse Reactions
1. Skin irritation and electrode burns are potential adverse reactions.
2. Headache and other painful sensations have been reported during or
following the application of electrical stimulation near the eyes and to the head
and face.
3. Use electrodes size area of less than 40mm x 40mm increases chance of
skin irritation.
Attention: Read the Manual before using the device.
Safety Information
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Axon
Instruction Manual
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Operation Keys
1. ON/OFF
Turns the device on and off.
2. INCREASE INTENSITY
Press this button to increase
amplitude. (intensity of stimulation)
3. DECREASE INTENSITY
Press this button to decrease
amplitude. (intensity of stimulation)
4. INCREASE FREQUENCY
Press this button to increase
frequency.
5. DECREASE FREQUENCY
Press this button to decrease
frequency.
6. PROGRAM
Select program from P1 to P6.
7. TIMER
Click once to select the next
available timer value. i.e.
continuous 15 min 30
min 45 min 60 min
continuous. If program is locked,
TIMER KEY can’t work.
Press & hold for 2 seconds to
display USAGE TIMER DISPLAY
stated.
8. 2/4 PAD, KEY LOCK
Click once to select for 2 or 4
pads.
Press & hold for 2 seconds to lock
or unlock a program.
1.
4.
2.
8.
7.
6.
5. 3.
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1. LEVEL BAR
Indicates the intensity level;
total of 15 levels.
2. MODE
Show stimulation mode & type
of current stimulation.
3. PROGRAM
Displays the current stimulation
program; total of 6 programs.
4. LOCK
Turn on when program is
locked.
5. PAD TYPE
Indicates if current output is
for 2 or 4 pads.
6. TIMER
Shows remaining treatment
time.
7. BATTERY LOW
Flashes when battery low.
8. FREQUENCY
ADJUSTMENT
“Manual Icon” turns on when
frequency can be adjusted.
“Auto Icon” turns on when
frequency cannot be adjusted.
5. 6. 7.
2.
8.
4.
1.
3.
LCD Display
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Operation
1. Electrode Setup
a. Prepare the skin by washing the electrode site with mild soap and water then
rinse and dry the area thoroughly.
b. Connect the electrodes to the lead wires before applying the electrodes to
the skin.
c. Place the electrodes on the skin. Then connect lead wires to the device.
Precaution: Do not disconnect any stimulation cables during a session while
the stimulator is switched on. Switch the stimulator off first. Always turn off
the stimulator before moving or removing any electrodes during a session.
Precaution: Do not apply stimulation in the vicinity of metal. Remove jewelry,
body piercings, buckles or any other removable metallic product or device in
the area of stimulation.
2. Turn on the Device
Press ON/OFF KEY
. LED displays when the device is on. Always switch the
device off before removing electrodes from the skin.
3. Select a Program
Use MODE KEY
to choose a desirable program from Program 1 to Program
6. The output intensity resets to zero when you change a treatment program.
4. Setting Treatment Parameters
The clinician will first set up the parameters for treatment and then proceed to
restrict the user’s ability to reprogram the unit.
5. 2/4 Pads Mode Button
Press
KEY to choose either 2-Pads or 4-Pads
treatment mode. When 2/4 Pads mode is changed, the
output intensity resets to zero.
In 4-PADS TREATMENT MODE, 2 sinusoidal outputs
with different frequencies will be delivered to Channel 1
and 2 respectively. Channel 1 delivers a xed 4kHz sine
wave while Channel 2 delivers a sine wave with frequency
ranges between 4002Hz and 4160Hz.
In 2-PADS TREATMENT MODE, 2 sine waves will
be superimposed inside the device to form a new
amplitude-modulated waveform. The resulting output is
simultaneously delivered to Channel 1 and 2.
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Instruction Manual
6. Adjust the Intensity
You can adjust a desired intensity by pressing the LEVEL
or LEVEL
accordingly.
7. Adjust the Beat Frequency
You can also change a frequency by pressing the FREQ.
and FREQ. when
the LCD displays the word “Manual”.
The output beat frequency ranges between 2Hz and 160Hz.
8. Lock and Unlock Your Own Program
To lock a program, rst adjust the “Level” Bar to zero, then press & hold
KEY
for 2 seconds. Whenever you turn on the device again, the program will come
up.
To unlock the program adjust level
bar to zero and hold the 2/4 key for 2
seconds. Then press & hold
KEY for 2 seconds.
9. Treatment Timer
Press TIMER KEY
to select your desired treatment
period ranging from 15, 30, 45 and 60 minutes. If no
timer is set, the device will provide a continuous output,
and no “CLOCK” symbol will be displayed.
Once you fix a treatment timer, the timer starts its
calculation only if the output level (Level Bar) is greater
than zero. When the treatment timer is operated, the
output intensity will no longer affect its operation. The
treatment timer begins to count down from its preset
value. You can notice the timer value from the LCD at
every minute interval. When the preset treatment period
is elapsed, the device switches off its output.
10. Usage Timer
Once you start the stimulation with output (i.e. non-
zero Level Bar), the User Timer automatically and
accumulatively counts your total usage up to 999 hours
59 minutes. The User Timer resets to zero when this
limit is reached.
To view the Usage Timer, set LEVEL
to zero, then
press & hold the TIMER KEY for 2 seconds.
The Usage Timer at the right LCD displays the total
usage of 3 hour 21 minutes.
To cancel the accumulated Usage Timer, press the
TIMER KEY
for another 2 seconds and it starts at
zero again. After 2 second eclipsed, LCD will show back
the ordinary contents.
Operation
Treatment
Timer
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Axon
Instruction Manual
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Treatment Programs
You can choose 6 different treatment programs.
When treatment program changes, the output intensity and treatment time resets to
zero, but changing the treatment program will not alter the choice of the 2-Pads or
4-Pads Treatment.
Program Type
I/F frequency
adjustable
Description
1 Constant Yes
2-160Hz Adjustable
2 to 20Hz adjustable in steps of 2Hz.
20 to 80Hz adjustable in steps of 5Hz.
80 to 160Hz adjustable in steps of 10Hz.
2 Sweep No
The beat frequency sweeps from 2Hz – 10Hz in 6
seconds, and then back in 6 seconds, total cycle time
is 12 seconds.
3 Sweep No
The beat frequency sweeps from 2 Hz to 100Hz in 10
seconds, and then back in 10 seconds, total cycle
time is 20 seconds.
4 Sweep Yes
The beat frequency changes gradually from the set
value to +200% of it in 6 seconds, and then back
in 6 seconds, total cycle time is 12 seconds. The
selectable beat frequency ranges between 5 ~ 80Hz
with steps of 5Hz.
5 Abrupt Ye s
The beat frequency changes abruptly between set
value and +200% of it every 1 second. The total cycle
repeats in 2 seconds. The selectable beat frequency
ranges between 5-80Hz with steps of 5Hz.
6 Abrupt Ye s
The beat frequency changes abruptly between set
value and +200% of it every 6 seconds. The total
cycle repeats in 12 seconds. The selectable frequency
ranges between 5~80Hz with step of 5Hz.
Placement of Electrodes
The placement of the electrodes is very important to the success of the treatment,
therefore please place electrodes according to the instructions of your treating
physician.
When operating in 4-Pads treatment mode, the
electrodes should be placed on the body as
described in the diagram below. The arrangement
of these 4 electrodes will allow the intersection
of the 2 sinusoidal outputs, which will result in
the required beat frequency. In 2-Pads treatment
mode, 2 separate pairs of electrodes can
simultaneously treat two different body regions.
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Instruction Manual
Battery Replacement
• Slide out the battery holder located at the bottom of the device.
• Take the used battery out of the holder and place a new battery.
• Check the polarity (+ at the front side).
• Slide the battery holder back to the device.
• Check the functions by pressing the keys.
Maintenance
The life of the electrodes depends on the frequency and time of usage as well as
the skin types and storage conditions. You may use a wet cloth for the dried or dirty
electrodes, but the electrodes with no adherence must be replaced.
The device requires neither routine maintenance nor calibration. When needed, for
occasional cleaning/disinfecting of the plastic covers, use alcohol wipes.
DO NOT immerse the device in water.
IMPORTANT. Only use the AC adaptor supplied together with the device. Use of
other adaptors may compromise safety.
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Instruction Manual
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Trouble Shooting
Problem Check Point Solution
No indication /
No start
Check the battery:
• Is battery dead?
• Correct polarity?
• Replace with new battery.
• Put the battery properly.
Bad contact
indication
Check the pads:
• Firmly placed?
• Dried or dirty
surface?
Check the electrode
pins to pads:
• Firmly connected?
Check the skin:
• Too dry?
• Press the pads to the skin.
• Replace with new pads.
• Connect to the pads.
• Moisturize the skin with a wet towel.
Skin irritation
Check the pads:
• Firmly placed?
• Dried or dirty?
Check the skin:
• Scar, cut or
damage?
• Too dry?
• Applied chemicals?
• Allergy?
• Press the pads to the skin.
• Replace new pads.
• Avoid the damaged area.
• Moisturize the skin with a wet towel.
• Remove all chemicals or cosmetics from the
skin.
• Stop using and consult a doctor.
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Specifications
Channel
Dual, isolated between channels
Mode
6 operation programs
Waveform
Symmetrical Balanced Sine Wave
Output Current
Adjustable, 0-33 mA across 500 Ohm load on each channel
Beat Frequency
2-160 Hz
Carrier Frequency
4000Hz (with ±1% tolerance) xed on Channel 1
Modulating Frequency
4002 ― 4160Hz (with ±1% tolerance) adjustable on Channel 2
Power Source
4 x 1.5V AA Size battery
OR
AC/DC adaptor(Input:100~240V AC ; Output: 6V, 1A DC)
Low Battery Detection
4.0V ± 0.1V
Treatment Timer
Continuous, 15, 30, 45 or 60 minutes
Usage Timer
Maximum 999 hours, 59 minutes
Automatic Power Off
If the output remains at zero for 5 minutes, the device will then
be automatically shut down.
Output Configuration
4-Pads Treatment
Conventional Interferential Current Therapy (IFC) with Channel 1
delivers a xed 4kHz sine wave, while output of Channel 2 can
be varied between 4002Hz and 4160Hz
2-Pads Treatment
Pre-modulated Interferential Current Therapy (IFC) in which
both Channel 1 and 2 will simultaneously deliver an amplitudemodulated output with beat frequency varies between 2 and
160Hz.
Environment For Storage
& Use
Temperature 0-40°C
Air humidity 30-75%
Air pressure 700hPa-1060hPa
Expected Service Life
5 years
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Instruction Manual
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Important Symbols
Refer to instruction manual/booklet.
Device with this symbol is an IEC/EN60601-1 type BF equipment.
It provides a high degree of protection against electric shock.
Council Directive 2002/96/EC concerning Waste Electrical and Electronic
Equipment (WEEE). Indicates a requirement not to dispose of WEEE as
municipal waste. Contact your local distributor for information regarding
disposal of the unit and accessories.
Keep dry.
The device is intended for continuous use with no degree of protection
against water penetration.
Date of manufacture.
Limited Warranty
Warning
While, in the opinion of Empi (“Empi”), the use of the Empi Axon (“the Product”)
has met with some success, Empi makes no warranties to the purchaser as to the
effectiveness of the product.
Warranty
A. Empi warrants to the initial Purchaser (“Purchaser”) (and to no other person) that
the Product (with the exclusion of accessories such as chargers, rechargeable
batteries, electrodes, lead wires, tape adhesive patches and electrode cream) and
the component parts thereof, distributed or manufactured by Empi, shall be free
from defects in the workmanship and materials for three years from the initial
date of purchase from Empi (the “Warranty Period”)
B. Accessories including, but not limited to, chargers, rechargeable batteries,
electrodes, lead wires, tape adhesive patches and electrode cream are excluded
from the Warranty and sold “AS IS” because their structure is such that they may
be easily damaged before or during use.
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Instruction Manual
Limitation of Liabilities and Disclaimer of Warranties
A. Empi’s sole obligation in the case of any breach of its warranties set forth in
Paragraph A above, shall be, at Empi’s option, to repair or replace the Product
without charge to Purchaser or to refund the purchase price of the Product.
In order to recover under this Warranty, Purchaser must send Empi written notice
of the defect (setting forth the problem in reasonable detail) prior to expiration
of the Warranty Period, and within 30 days of discovery of the defect. Upon
Empi’s written request and authorization, Purchaser shall return the Product to
Empi, freight and insurance prepaid, for inspection. Notice and return shipment
shall be sent to Empi at 47492 Hwy. 22, Clear Lake, South Dakota 57226, USA,
or to an Empi Authorized Service Center. To locate the appropriate Service
Center outside of North America, or to request shipment approval, contact Empi
directly. Empi will not be responsible for damage due to improper packaging or
shipment. If Empi determines in its sole reasonable discretion that the Product
contains defective workmanship or materials, Empi will refund to the Purchaser,
the purchase price for the defective product, or return the repaired Product or a
replacement thereof to Purchaser, the purchase price for the defective product,
or return the repaired Product or a replacement thereof to Purchaser, freight
and insurance prepaid, as soon as reasonably possible following receipt of the
Product by Empi. Empi determines in its sole reasonable discretion that the
Product does not contain defective workmanship or materials, Empi will return
the Product to the Purchaser, freight and insurance billed to the Purchaser.
B. This Warranty is voided immediately as to any Product which has been repaired
or modified by any person other than authorized employees or agents of Empi
or which has been subjected to misuse, abuse, neglect, damage in transit,
accident or negligence.
C. Except as provided in paragraph A, the product is being sold on an as is
basis, all accessories are sold as is, and the entire risk as to the quality and
performance of the product is with purchaser. The warranty provided in
paragraph A is intended solely for the benefit of the initial purchaser and Empi
disclaims all other warranties, express or implied including, but not limited to,
any implied warranties of merchantability and fitness for a particular purpose;
provided, however, that notwithstanding the foregoing sentence, in the event
an implied warranty is determined to exist, the period for performance by
Empi thereunder shall be limited to the lifetime of the initial purchaser. No
employee, representative or agent of Empi has any authority to bind empi to any
affirmation, representation or warranty except as stated in this written warranty
policy.
D. Empi shall not be liable to any person for any direct, indirect, special, incidental
or consequential damages, lost profits or medical expenses caused by any
defect, failure, malfunction or otherwise of the product, regardless of the form in
which any legal or equitable action may be brought against Empi (e.g. contract,
negligence or otherwise) the remedy provided in paragraph A above shall
constitute purchaser’s sole remedy. In no event shall Empi’s liability under any
cause of action relating to the product exceed the purchase price of the product.
This Warranty gives the Purchaser specic legal rights and Purchaser may also have
other rights which vary from state to state. Some states do not allow limitations of
how long an implied warranty lasts, so the above limitation may not apply to the
Purchaser.
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FOR USA MARKET
Caution: Federal law restricts this device to sale by or on the order of a
practitioner licensed by the law of the State in which he/she practices to use or
order the use of the device.
Empi, Inc.
205 Hwy 22 East
Clear Lake, SD, 57226 USA
651.415.9000; 1.800.328.2536
360431 Rev. B © 2014 Empi, Inc.
Made in China
Distributed by Empi, Inc.
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