Amrex SynchroSonic US/50 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
SynchroSonic
US/50*
Amrex
®
electrotherapy equipment
a division of Amrex-Zetron, Inc.

AMREX®electrotherapy equipment
a division of Amrex-Zetron, Inc.
641 East Walnut Street
Carson, California 90746
[phone]
Toll Free Customer Service [phone]
Fax [phone]
E-Mail: [e-mail]
Web Site: http://www.amrex-zetron.com
SynchroSonic US/50 User's Guide
Revised August 1998
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®
QuickConnect™
Flextrode®

i
Thank you. . .
for selecting the Amrex SynchroSonic US/50. We believe that you will find this
instrument to be versatile, dependable and user friendly. The SynchroSonic
US/50 provides two widely used therapeutic modalities: Low VoltAC Stimulation
and Ultrasound. Each modality may be applied separately or the Ultrasound may
be combined with Low Volt AC Stimulation simultaneously through the ultrasound
transducer.
Your SynchroSonic US/50 has been manufactured by a group of dedicated, highly
trained employees who exemplify the sixty yearAmrex tradition of manufacturing
therapeutic equipment of the highest quality while supporting you with prompt,
courteous customer service.
Upon receipt of your SynchroSonic US/50, verify your accessories against the
enclosed check list. Promptly return the postage paid Registration Card to Amrex.
Save the original shipping carton and all packing materials.
Please carefully review this User’s Guide prior to operating the SynchroSonic
US/50. Should you have questions regarding 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.
There is a one (1) year warranty on the ultrasound transducer and cable.
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
dueto misuse,alteration orabnormal conditionof operation,including evidencethat 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 compliance with FDA, 21 CFR 1050.10 Performance Standards, your Amrex
ultrasound 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 theac linecord,mustbe includedwith thereturnedinstrument.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 Stimulator modality 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.
Patient"TreatmentStop"Switch: When thepatient "TreatmentStop" switchis activated, stimulator
output will be discontinued immediately. The Stimulator Reset Intensity indicator light will
illuminate. Stimulatoroutput cannot beresumeduntil theLow VoltACIntensity controlis returned
to the 0/Reset position enabling the audible "click" which will turn off the Stimulator Reset Intensity
indicator light. NOW the stimulator 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,or performanceofprocedures,other thanthose specified
herein, may result in hazardous exposure to ultrasonic and/or
electrical energy.

iv
Ultrasound—Contraindications
Ultrasoundshould notbeused inthe followingareas: transcerebrally;nearthe heartor reproductive
organs; over viscera, eyes, ears, the spinal column, malignancies, the joint capsule in arthritic
conditions either acute or subacute, or over total joint replacements. Ultrasound should not be
used in cases of: cardiac pacemakers, pregnancy, implants, malignant or benign tumors, multiple
sclerosis,arteriosclerosisor weakenedblood vessels, hemophilia,thrombosis andthrombophlebitis
either acute or subacute. Neither should ultrasound be used over bone in growing children,
where the skin suffers from any sensory impairment, nor in the area of the carotid sinus nerves,
visceral plexus or large autonomous ganglion.
Ultrasound—Precautions
Excessive doses of ultrasound can cause damage to tissue. Periosteal pain is an indication of
excess intensity. Should this occur, reduce the power and/or move the transducer more quickly
over the area being treated.
Anybleeding tendencyisincreased byheating becauseofthe increase inbloodflow and vascularity
of the heated tissues. Care should be used in treating patients who have bleeding disorders.

v
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.
Adequateprecautions shouldbe takenin thecaseof personswithsuspected 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.
Skinirritation andburnsbeneath theelectrodeshave beenreportedwith theuse of electrical
muscle stimulators.

vi

vii
Part 1
Overview................................................................................................................................. 1
Part 2
Power Section ........................................................................................................................ 5
Part 3
Low Volt AC Stimulator Modality .................................................................................... 9
Part 4
Ultrasound Modality.......................................................................................................... 15
Part 5
US/50 General Operation and Application Procedures ................................................ 21
General Operation Ultrasound Modality ............................................................................... 21
Application of Ultrasound ........................................................................................................ 23
Adverse Effects - Shortwave Diathermy Interference .......................................................... 24
Ultrasound—Indications ........................................................................................................... 25
Ultrasound—Contraindications ............................................................................................... 26
Ultrasound—Precautions ..........................................................................................................26
The Ultrasound Transducer ...................................................................................................... 27
Transducer Cable Fault Alarm System.................................................................................... 27
QuickConnect Transducer Cable System (Optional Feature).............................................. 28
Dual Transducers (Optional Feature) ...................................................................................... 29
General Operation Low Volt AC Stimulator Modality ......................................................... 30
Application of Electrical Muscle Stimulation......................................................................... 32
Adverse Effects - Shortwave Diathermy Interference .......................................................... 33
Electrical Muscle Stimulation—Indications............................................................................ 34
Electrical Muscle Stimulation—Contraindications................................................................ 34
Electrical Muscle Stimulation—Warnings .............................................................................. 34
Electrical Muscle Stimulation—Precautions........................................................................... 35
US/50 Combination Mode........................................................................................................ 36
Ultrasound Modality Combined With Low Volt AC Stimulator Modality ....................... 36
Control Settings and General Operation......................................................................... 36
Appendix A
Specifications ....................................................................................................................... 39
Appendix B
References.............................................................................................................................. 43
Table of Contents

viii

Overview
US/50 User's Guide 1
Part 1
AMREX
The layout of the US/50 panel is logically arranged into three major sections.
These sections are, from left to right: Power, Low Volt AC Stimulator and
Ultrasound.

2US/50 User's Guide
Part 1
In the illustration below, dashed lines surround each of the US/50's sections.
Abrief description of each section follows the illustration, and Parts 2 through 4 of
this manual contain detailed descriptions.

US/50 User's Guide 3
Overview
Power Section
Use the Power Section to select the treatment modality, 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.
Ultrasound Modality Section
Set the intensity and monitor the output of ultrasonic energy with the controls,
connectors and meter dial in this section of the panel. Select either non-interrupted
output or a specific interrupted rate using the Interrupted Output slide control.
Combine ultrasound output with low volt ac stimulation using the Combination
switch.

4US/50 User's Guide
Part 1

Power Section
US/50 User's Guide 5
In the illustration below, dashed lines surround the US/50's power section.
Part 2
AMREX

6US/50 User's Guide
Part 2
The power section of the US/50 panel is depicted below. Items referenced with
circled numbers (1 – 2) are explained on the following page.

US/50 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 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. INTERNAL POWER: (Modality Selections): Controls the secondary ac power
for each of the two modality sections:
Ultrasound
Stimulator
Combination (Ultrasound and Stimulator modalities)
The Ultrasound On indicator light (located above the upper left corner of the
ultrasound meter),and the Stimulator On indicator light (located in the upper
leftcorner of theLow VoltAC Stimulator section),will independently illuminate
when each modality is activated.
Combination provides for ultrasound and low volt ac stimulation output to
be applied simultaneously through the ultrasound transducer. When the
Combination switch is not activated, only ultrasonic energy is obtained through
the transducer even though the stimulator may still be active.
The Combination indicator light (located above the upper middle of the
ultrasound meter) will illuminate if Ultrasound, Stimulator, and Combination
are all activated.

8US/50 User's Guide
Part 2

Low Volt AC Stimulator Modality
US/50 User's Guide 9
In the illustration below, dashed lines surround the US/50's low volt ac stimulator
section.
Part 3
AMREX

10 US/50 User's Guide
Part 3
The low volt ac stimulator section of the US/50 panel is depicted below. Items
referenced with circled numbers (3 – 6) are explained on the following page.