Amrex MS322 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
MS322*
Low Volt AC Muscle Stimulator
Amrex
®
electrotherapy equipment
a division of Amrex-Zetron, Inc.

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
MS322 User's Guide
Low Volt AC Muscle 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®
SynchroSonic®
Flextrode®

i
Thank you. . .
for selecting the Amrex MS322 Low Volt AC Muscle Stimulator. We believe that
you will find this instrument to be versatile, dependable and user friendly. The
MS322 is designed for the application of low volt ac muscle stimulation. TheAmrex
MS322 Low Volt AC Muscle Stimulator is a single channel, two pad, low voltage
electrical muscle stimulator that produces pulsation, tetanize and surge output.
The electrical muscle stimulation may be applied separately or may be combined
with ultrasound simultaneously through the ultrasound transducer using an
external Amrex SynchroSonic U/50.
Your MS322 has been manufactured by a group of dedicated, highly trained
employees who exemplify the sixty year Amrex tradition of manufacturing
therapeutic equipment of the highest quality while supporting you with prompt,
courteous customer service.
Upon receipt of your MS322, verify your accessories against the enclosed check
list. Promptly return the postage paid Registration Card toAmrex. Save the original
shipping carton and all packing materials.
Please carefully review this User’s Guide prior to operating the Amrex MS322
Low Volt AC Muscle Stimulator. Should you have questions regarding your new
purchase, or need assistance, telephoneAmrex 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
due to misuse, alteration or abnormal condition of operation, including evidence that
nonauthorized 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
Amrex Technical Services has a representative to assist you should your equipment require 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, resulting from repairs made outside the factory, is not covered under the warranty.
To maintain original design specifications, your Amrex muscle stimulator must be calibrated
and safety tested 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 return Amrex equipment to
the factory for service; repair; annual calibration, electrical and mechanical safety check. All
accessories, including the ac line cord,must beincludedwiththereturnedinstrument.The customer
is responsible for all freight charges. The Manufacturer shall assume NO responsibility for 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
"hospital grade" plug should be connected to a GROUNDEDAC wall receptacle. It is the personal
responsibility and obligation of the user to insure that this instrument is properly connected to
the AC POWER source before use.
Important
AMREX Intensity Reset Circuit: The Amrex Low Volt AC Muscle Stimulator incorporates a
unique safety reset function as part of the intensity control. This is to prevent any sudden or
inadvertent stimulation output to the patient in the event that:
The Low Volt AC Intensity control is not set to the 0/Reset position enabling the audible
"click" at power on, provided the power has been off for more than ten seconds.
The ac power is interrupted for more than ten seconds before power is restored.
The treatment period has ended and more than ten seconds has elapsed before power on.
The Low Volt AC Intensity control must be returned to the 0/Reset position enabling the audible
"click" before stimulation output can be activated.
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,orperformanceofprocedures,other thanthose specified
herein, may result in hazardous exposure to electrical energy.

iv
Electrical Muscle Stimulation—Contraindications
Contraindicated for patients with cardiac demand pacemakers.
Should not be used on cancer patients.
Electrical Muscle Stimulation—Warnings
Long term effects of chronic electrical stimulation are unknown.
Safety has not been established for the use of electrical muscle stimulation during
pregnancy.
Adequateprecautionsshould betaken inthe case of persons with suspected heart problems.
Adequate precautions should be taken in the case of persons with suspected or diagnosed
epilepsy.
Do not stimulate over the carotid sinus nerves, especially in patients with a known
sensitivity to the carotid sinus reflex.
Severe spasm of the laryngeal and pharyngeal muscles may occur when the electrodes
are positioned over the neck or mouth. The contractions may be strong enough to close
the airway or cause difficulty 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.
Electrical Muscle Stimulation—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.
Skinirritationandburnsbeneaththeelectrodeshave beenreportedwiththeuseof electrical
muscle stimulators.

v
Table of Contents
Part 1
Overview................................................................................................................................. 1
Part 2
Power Section ........................................................................................................................ 5
Part 3
Low Volt AC Stimulator Modality .................................................................................... 9
Part 4
MS322 General Operation and Application Procedures ............................................... 13
General Operation ...................................................................................................................... 13
Application of Electrical Muscle Stimulation......................................................................... 15
Adverse Effects - Shortwave Diathermy Indications............................................................ 16
Electrical Muscle Stimulation—Indications............................................................................ 17
Electrical Muscle Stimulation—Contraindications................................................................ 17
Electrical Muscle Stimulation—Warnings .............................................................................. 17
Electrical Muscle Stimulation—Precautions........................................................................... 18
Appendix A
Specifications ....................................................................................................................... 19
Appendix B
References.............................................................................................................................. 21

vi

The layout of the MS322 panel consists of controls, indicator lights, and output
jacks.
Overview
MS322 User's Guide 1
OUTPUT
RESET
INTENSITY
OUTPUT
RATE
OFF
0
15
5
10
25
20
TIME IN MINUTES
MAX
0 / RESET
FAST
SLOW
TETANIZE
PULSATION SURGE
ON
PULSE / SURGE RATE INTENSITY
Part 1
AMREX

2MS322 User's Guide
Part 1
In the illustration below, dashed lines surround each of the MS322's sections.
A brief description of each section follows the illustration, and Parts 2 and 3
of this manual contain detailed descriptions.
Power/
Timer
Low Voltage Stimulator
OUTPUT
RESET
INTENSITY
OUTPUT
RATE
OFF
0
15
5
10
25
20
TIME IN MINUTES
MAX
0 / RESET
FAST
SLOW
TETANIZE
PULSATION SURGE
ON
PULSE / SURGE RATE INTENSITY

MS322 User's Guide 3
Overview
Power Section
Use the Power/Timer to activate the main ac power and set the treatment duration.
When the treatment is complete the power will shut off and a bell will sound.
Low Volt AC Stimulator Modality Section
Set the intensity and monitor the output of low volt ac stimulation with the controls
and connectors in this section of the panel. Select either pulsation, tetanize, or
surge output using the Output Mode control. Regulate the frequency of the pulses,
or adjust the duration of the surge, with the Pulse/Surge Rate control.

4MS322 User's Guide
Part 1

Power Section
MS322 User's Guide 5
In the illustration below, dashed lines surround the MS322's power section.
OUTPUT
RESET
INTENSITY
OUTPUT
RATE
OFF
0
15
5
10
25
20
TIME IN MINUTES
MAX
0 / RESET
FAST
SLOW
TETANIZE
PULSATION SURGE
ON
PULSE / SURGE RATE INTENSITY
Power/
Timer
Part 2
AMREX

6MS322 User's Guide
Part 2
The power section of the MS322 panel is depicted below. Items referenced with
circled numbers (1 – 2) are explained on the following page.
INTENSITY
0 / RESET
MAX
SLOW
FAST
PULSATION
TETANIZE
SURGE
OFF
0
15
5
10
20
TIME IN MINUTES
OUTPUT
RESET
INTENSITY
OUTPUT
RATE
ON
PULSE / SURGE RATE
25

MS322 User's Guide 7
Power Section
1. POWER/TIMER: Controls the main ac power as well as the timer for treatment.
Turn the Power/Timer knob clockwise past the 10 minute mark and then set it
to the desired treatment time. The On indicator light (located to the right of the
Power/Timer) will illuminate. The ac power will shut off and a bell will sound
when treatment is completed. To initiate early shut off, turn the Power/Timer
knob counterclockwise to the Off position. The ac power will shut off and a
bell will sound.
2. ON INDICATOR LIGHT: Will illuminate when the Power/Timer is activated.

8MS322 User's Guide
Part 2

MS322 User's Guide 9
In the illustration below, dashed lines surround the MS322's low volt ac stimulator
section.
Low Volt AC Stimulator Modality
OUTPUT
RESET
INTENSITY
OUTPUT
RATE
OFF
0
15
5
10
25
20
TIME IN MINUTES
MAX
0 / RESET
FAST
SLOW
TETANIZE
PULSATION SURGE
ON
PULSE / SURGE RATE INTENSITY
Low Voltage Stimulator
Part 3
AMREX

10 MS322 User's Guide
Part 3
The low volt ac stimulator section of the MS322 panel is depicted below. Items
referenced with circled numbers (3 – 8) are explained on the following page.
OUTPUT RESET
INTENSITY
OUTPUT
RATE
OFF
0
15
5
10
25
20
TIME IN MINUTES
MAX
0 / RESET
FAST
SLOW
TETANIZE
PULSATION SURGE
ON
PULSE / SURGE RATE INTENSITY

MS322 User's Guide 11
LowVoltACStimulator Modality
3. LOW VOLT AC OUTPUT MODE CONTROL: (SELECTIONS):
Pulsation – Pulsed output (variable from 1 to 80 pulses per second)
Tetanize – Continuous output (set at 80 pulses per second)
Surge – Surged output (set at 80 pulses per second, surge rate
duration variable from 3.75 seconds on, 3.75 seconds off to 0.375
second on, 0.375 second off)
4. PULSE / SURGE RATE CONTROL:
Pulsation Mode – Regulates the pulsation rate from SLOW (1 pulse
per second) to FAST (maximum of 80 pulses per second)
Surge Mode – Regulates the surge rate from SLOW (3.75 seconds
on, 3.75 seconds off) to FAST (0.375 second on, 0.375 second off)
Note: The Pulse / Surge Rate control has no effect in the Tetanize Mode.
5. OUTPUT RATE INDICATOR LIGHT: Reflects the output rate for Pulsation,
Tetanize, or Surge Mode.
6. LOW VOLT AC INTENSITY CONTROL:Regulates the stimulator output
from 0 to MAX. The Intensity control has a unique reset circuit feature
which prevents the practitioner from applying one patient's treatment
settings to another patient. The AMREX Reset Circuit also allows the
continuation or extension of the patient's treatment period if power is
restored within ten (10) seconds.
7. LOW VOLT AC RESET INTENSITY INDICATOR LIGHT: When power
is restored more than ten seconds after being interrupted or turned
off, or more than ten seconds after the treatment period has been
completed and the bell has sounded, the Low Volt AC Reset Intensity
indicator light will illuminate. The Intensity control must be returned
to the 0/Reset position enabling the audible "click" which will turn
off the Reset Intensity indicator light. NOW the stimulator output can
be activated.
When power is restored within ten (10) seconds after being interrupted or
turned off, or within ten (10) seconds after the treatment period has been
completed and the bell has sounded, theAMREX Reset Circuit will be bypassed
and the Reset Intensity indicator light will not illuminate. This will allow the
continuation or extension of the patient's treatment period.
8. LOW VOLT AC STIMULATOR OUTPUT JACKS

12 MS322 User's Guide
Part 3