Amrex Z-STIM IF250 User manual

*Federal law (USA) restricts this device to sale by or on the order of a licensed practitioner licensed by the law of the state in which
he practices to use or order the use of this device.
User's Guide
Amrex
®
electrotherapy equipment
a division of Amrex-Zetron, Inc.
Z-STIM™ IF250*
Interferential / Russian Stimulator

AMREX®electrotherapy equipment
a division of Amrex-Zetron, Inc.
7034 Jackson Street
Paramount, California 90723
[phone]
Toll Free Customer Service [phone]
Fax [phone]
E-mail [email protected]
Web Site http://www.amrexusa.com
IF250 User's Guide
Interferential/Russian Stimulator
Revised February 2014
Copyright©Amrex-Zetron, Inc. 1995. All rights reserved.
Printed in the United States of America
The following are registered or trademarked by Amrex:
Amrex®
Z-Stim™
Flextrode®

i
Thank you. . .
forselectingtheAmrexZ-StimIF250 Interferential/RussianStimulator.We believe
that you will find this instrument to be versatile, dependable and user friendly.
The IF250provides threewidely used modalities: Quad-Polar True Interferential,
Bi-Polar Interferential and Russian stimulation.
Your IF250 has been manufactured by a group of dedicated, highly trained
employees who exemplify the Amrex tradition, since 1935, of manufacturing
therapeutic equipment of the highest quality while supporting you with prompt,
courteous customer service.
Upon receipt of your IF250, verify your accessories against the enclosed check list.
Promptly return the postage paid Registration Card to Amrex. Save the original
shippingcartonandall packingmaterials.
Please carefully review this User’s Guide prior to operating the Amrex Z-Stim
IF250Interferential/RussianStimulator. Shouldyouhaveanyquestionsregarding
your new purchase, or need assistance, telephone Amrex Technical Services at
[phone].

ii
Limited Warranty
Amrex-Zetron, Inc. (Manufacturer) warrants each instrument it manufactures to be free from
defects in material and workmanship under normal use and service for a period of two (2) years
from the date of purchase. This two year warranty extends only to the original purchaser and
shall not apply to batteries, fuses, accessories or any instrument which has been subjected to
misuse, neglect, accident or abnormal conditions of operation.
The Manufacturer's obligation under this warranty is limited to repairing or replacing, at the
Manufacturer's option, any instrument returned to the factory within two (2) years from the date
of purchase. If the Manufacturer determines that the product fails to conform to this warranty
duetomisuse,alterationorabnormalconditionofoperation,includingevidencethatnonauthorized
personnel have attempted to repair the device, the instrument will be repaired at customers
expense. This warranty is exclusive and in lieu of all other warranties, expressed or implied,
including but not limited to any other warranty of merchantability or fitness for any particular
purpose. Manufacturer shall not be liable for any special, incidental or consequential damages,
whether in contract, tort or otherwise.
Service and Shipping Information
AmrexTechnicalServices hasa representativeto assistyou shouldyourequipmentrequire service
or repair. It is necessary to obtain a Return Merchandise Authorization (RMA) number before
returning equipment to the factory for warranty repair. Call our representative toll free (800) 221-
9069.Damage, resultingfromrepairsmade outside the factory, is not coveredunderthe warranty.
Tomaintainoriginaldesignspecifications,yourAmrexIF250mustbecalibratedandsafetytested
on an annual basis. Amrex strongly recommends that servicing be referred to the factory. Call
toll free [phone].
Save the original shipping carton and all packing materials to safely returnAmrex equipment to
the factory for service; repair; annual calibration, electrical and mechanical safety check. All
accessories,including theaclinecord,mustbeincludedwiththereturnedinstrument.The customer
isresponsibleforallfreightcharges.TheManufacturershallassumeNOresponsibilityfor damage
in transit.

iii
Contraindications—Warnings—Precautions
THIS INSTRUMENT OPERATES ON 120 VOLTS AC 60 Hz. (unless otherwise indicated on the
unit) AND MUST BE PROPERLY GROUNDED FOR SAFETY. The three wire power cord with
"hospitalgrade" plug should be connectedto a GROUNDEDAC wall receptacle.It is thepersonal
responsibility and obligation of the user to insure that this instrument is properly connected to
the AC POWER source before use.
Warning–Risk of burns and fire. DO NOT use near conductive
material such as metal bed parts or innerspring mattresses. Renew
electrode cables upon evidence of deterioration. Use of controls,
adjustment,orperformance ofprocedures,other thanthose specified
herein, may result in hazardous exposure to electrical energy.
Important
AMREX Intensity Reset Circuit: The Amrex IF250 incorporates a unique safety reset function
as part of the Intensity controls. This is to prevent any sudden or inadvertent stimulation output
to the patient in the event that:
• at power on, the Intensity controls are not set to the 0/Reset position enabling
the audible "clicks"
• the treatment period has ended
• the Patient Treatment Stop Switch is activated
• the Reset Functions control is pressed
• the ac power is interrupted
• theQuad-Polar mode Channel1 Intensity setting variesmore than ±20% from
the Channel 2 Intensity setting for longer than 30 seconds
When the Amrex IF250 safety reset functionis initiated, stimulator output will be discontinued
immediately, the Reset Intensities indicator light will flash and an audible signal will be emitted
from the generator. The Intensity controls must be returned to the 0/Reset position, enabling
the audible "clicks", a treatment time selected, and the Start Timer control pressed before
stimulator output can be activated.
Note: The generator will default to factory settings unless the treatment period has ended
without interruption or the Patient Treatment Stop Switch has been activated.
Patient Treatment Stop Switch: When the Patient TreatmentStop Switchis activated, stimulator
output will be discontinued immediately. The Reset Intensities indicator light will flash and an
audible signal will be emitted from the generator. Stimulator output cannot be resumed until
the Channel 1 Intensity and Channel 2 Intensity controls are returned to the 0/Reset position
enabling the audible "clicks", a treatment time selected and the Start Timer control pressed.
NOW the stimulator output can be activated.
Note: All generator settings are maintained except the treatment time which reverts to the
factory default setting of fifteen minutes.

iv
ElectricalMuscleStimulation—Contraindications
•Contraindicatedfor patientswith cardiacdemand pacemakers
•Should not be used on cancer patients
ElectricalMuscleStimulation—Warnings
•Long term effects of chronic electrical stimulation are unknown
•Safetyhasnotbeenestablishedfortheuseofelectricalmusclestimulationduring pregnancy
•Adequateprecautionsshouldbetakeninthe caseofpersonswith suspectedheart problems
•Adequate precautions should be taken in the case of persons with suspected or diagnosed
epilepsy
•Donotstimulateoverthecarotidsinusnerves,especiallyinpatientswithaknownsensitivity
to the carotid sinus reflex
•Severespasmof thelaryngeal andpharyngealmuscles mayoccur whentheelectrodes are
positioned over the neck or mouth. The contractions may be strong enough to close the
airwayor causedifficulty in breathing
•Electrical muscle stimulators should not be applied transcerebrally
•Electrical muscle stimulators should not be used over swollen, infected or inflamed areas
or skin eruptions
•Caution should be used in the transthoracic application of electrical muscle stimulators in
that the introduction of electrical current into the heart may cause arrhythmias
•Electrical muscle stimulators should be kept out of the reach of children
ElectricalMuscleStimulation—Precautions
Precautions should be observed:
•When there is a tendency to hemorrhage following acute trauma or fracture
•Following recent surgical procedures when muscle contraction may disrupt the healing
process
•Over the menstruating uterus
•Where sensory nerve damage is present by a loss of normal skin sensation
Some patients may experience skin irritation or hypersensitivity due to the electrical
stimulation or the conductive medium. The irritation can usually be reduced by use of
an alternate conductive medium or alternate electrode placement.
Skin irritation and burns beneath the electrodes have been reported with the use of
electrical muscle stimulators.

v
Table of Contents
Part 1
Overview................................................................................................................................. 1
Part 2
Power/Timer Section .............................................................................................................5
Part 3
Quad-Polar Interferential Modality .................................................................................. 9
Part 4
Bi-Polar Interferential Modality ...................................................................................... 19
Part 5
Russian (2500 Hz) Modality.............................................................................................. 29
Part 6
IF250 General Operation and Application Procedures ................................................. 37
General Operation of Quad-Polar Interferential Modality .................................................. 37
Interferential Burns .................................................................................................................... 40
Application of Electrical Muscle Stimulation Quad-Polar ................................................... 41
General Operation of Bi-Polar Interferential Modality......................................................... 42
Application of Electrical Muscle Stimulation Bi-Polar.......................................................... 45
General Operation of Russian (2500 Hz) Modality............................................................... 46
Application of Electrical Muscle Stimulation Russian.......................................................... 50
Adverse Effects - Shortwave Diathermy Interference .......................................................... 51
Electrical Muscle Stimulation—Indications............................................................................ 52
Electrical Muscle Stimulation—Contraindications................................................................ 52
Electrical Muscle Stimulation—Warnings .............................................................................. 52
Electrical Muscle Stimulation—Precautions........................................................................... 53
Appendix A
Specifications ....................................................................................................................... 55
Appendix B
References.............................................................................................................................. 57

vi

Thelayout of theIF250 panel consists of controls,indicator lights, digital displays
and output jacks.
IF250 User's Guide 1
Overview
Part 1
AMREX

2IF250 User's Guide
Part 1
Intheillustrationbelow,dashedlinessurround eachoftheIF250'ssections. Abrief
descriptionofeachsectionfollowstheillustration.Parts2through5ofthismanual
containdetaileddescriptions.

IF250 User's Guide 3
Overview
Power / Timer Section
Use Power / Timer Section to activate the main ac power, select the treatment
modality, set the treatment duration and activate the timer. When the treatment
is complete the generator will emit an audible signal and the Reset Intensities
indicator light will flash.
Quad-Polar Interferential Modality Section
Selectthebeatfrequency,settheintensitiesandmonitortheoutputofthe Standard
orDynamicQuad-PolarInterferential modewiththecontrolsanddigital displays.
Bi-Polar Interferential Modality Section
Selecttheamplitude modulationfrequency, settheintensityandmonitor the output
of the Bi-Polar Interferential mode (single or dual channel) with the controls and
digitaldisplays.
Russian (2500 Hz) Modality Section
Set the intensity and monitor the output of the Continuous, Exercise or Rehab
Russian (2500 Hz) mode (single or dual channel) with the controls and digital
displays.

4IF250 User's Guide
Part 1

Power / Timer Section
IF250 User's Guide 5
Inthe illustrationbelow,dashedlines surroundtheIF250's Power /Timersection.
Part 2
AMREX

6IF250 User's Guide
Part 2
The Power / Timer section of the IF250 panel is depicted below. Items referenced
with circled numbers (1 – 9) are explained on the following page.

IF250 User's Guide 7
Power/Timer Section
1. QUAD-POLAR INTERFERENTIAL MODALITY INDICATOR LIGHT
2. MODE CONTROL: Selects the Quad-Polar, Bi-Polar or Russian modality.
The selected modality indicator light will illuminate. The Russian modality
indicatorlightwillflash.
Note: The Mode control is inoperable after the Start Timer control is pressed.
3. BI-POLAR INTERFERENTIAL MODALITY INDICATOR LIGHT
4. RUSSIAN (2500 Hz) MODALITY INDICATOR LIGHT
5. START TIMER CONTROL: Activates treatment timer when pressed. A
flashingdecimalpointonthePower/Timerdisplay indicatestimercountdown.
Note: After the Start Timer control is pressed, the Mode control is inoperable.
6. POWER / TIMER DISPLAY: Digital display of treatment duration. Ranges
from 1 to 99 minutes. Aflashing decimal point indicates timer countdown in 1
minuteincrements.
7. TIME CONTROL(INCREASE- upward arrow): Rangesfrom1minuteto99
minutes as indicated on the Power / Timer display. The default setting is 15
minutes. Toadjust thetreatmentdurationinoneminute increments,pressand
release. For rapid adjustment, press and hold until the desired treatment
duration setting is reached. The treatment duration setting may be increased
during the treatment period.
8. TIME CONTROL(DECREASE-downward arrow): Ranges from99 minutes
to 1 minute as indicated on the Power / Timer display. The default setting is 15
minutes. To adjust the treatment duration in one minute increments, press
and release. For rapid adjustment, press and hold until the desired treatment
duration setting is reached. The treatment duration setting may be reduced
during the treatment period.
9. POWER CONTROL: Controlsthe mainacpower. Whenthepoweristurned
on,the generator will self-test. All indicators willilluminate, an audible signal
willbeemittedandthe generatorwill defaultto factorysettings. If the intensity
controls are not set to the 0/Reset position, the generator will emit a series of
audible signals and the Reset Intensities indicator light will flash. The Channel
1 Intensity and Channel 2 Intensity controls must be returned to the 0/Reset
position, enabling the audible "clicks", which will turn off the Reset Intensities
indicator light and the audible signal. The generator will default to factory
settings.

8IF250 User's Guide
Part 2

IF250 User's Guide 9
Intheillustrationbelow,dashedlinessurroundtheIF250'sQuad-PolarInterferential
section.
Quad-Polar Interferential Modality
Part 3
AMREX

10 IF250 User's Guide
Part 3
The Quad-Polar Interferential section of the IF250 panel is depicted below. Items
referenced with circled numbers (10 – 14) are explained on the following page.

IF250 User's Guide 11
Quad-Polar Interferential Modality
10. CONSTANT MODE AND SWEEP MODE INDICATOR LIGHTS
11. CONSTANT / SWEEP FREQUENCY MODE CONTROL: Selects a
Constant or Sweep mode. The Constant mode provides is a preset beat
frequency and the Sweep mode provides a preset beat frequency range. The
indicator light for the selected mode will illuminate. The Constant or Sweep
mode can be changed during the treatment period except when the Dynamic
mode is activated.
Note: Before changing the Constant or Sweep mode during the
treatment period, reduce the Channel 1 Intensity and Channel 2
Intensity controls to the 0/Reset position, enabling the audible
"clicks".
12. CONSTANT / SWEEP FREQUENCY INDICATOR LIGHT ARRAY:
Indicates the selected Constant mode beat frequency or the Sweep mode beat
frequencyrange.
13. FREQUENCY CONTROL: Selects a Constant beat frequency or a Sweep
beat frequency range. The indicator light for the selected beat frequency will
illuminate.TheChannel2Outputfrequencyis4000HzlesstheselectedConstant
mode beat frequency or Sweep mode beat frequency range. The Channel 1
Output frequency is 4000 Hz.
• Constant Mode – Selects a preset beat frequency of : 1,10,30,
80, 130 or 150 Hz
• Sweep Mode – Selects a preset beat frequency range of:
(80-150 Hz) Pain, (1-10 Hz) Edema, (1-150 Hz) Rehab,
30-80 Hz, 10-100 Hz, or 80-100 Hz
TheConstantmodebeatfrequencyselectionortheSweepmodebeatfrequency
range selection can be changed during the treatment period except when the
Dynamic mode is activated.
Note: Before changing the Constant mode beat frequency or the
Sweep mode beat frequency range during the treatment period,
reduce the Channel 1 Intensity and Channel 2 Intensity controls to
the 0/Reset position, enabling the audible "clicks".
14. FREQUENCY DISPLAY: Digitaldisplayof theselected Constantmode beat
frequency or Sweep mode beat frequency range. The digital display ranges
from a minimum of 1 Hertz to a maximum of 150 Hertz. During the Sweep
mode,the beatfrequency isdisplayed as italternates betweenthe minimumto
maximum value of the selected beat frequency range.

12 IF250 User's Guide
Part 3
The Quad-Polar Interferential section of the IF250 panel is depicted below. Items
referenced with circled numbers (15 – 18) are explained on the following page.