Amrex SynchroSonic U/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
U/50*
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
SynchroSonic U/50 User's Guide
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®
QuickConnect™
Flextrode®

i
Thank you. . .
for selecting the Amrex SynchroSonic U/50. We believe that you will find this
instrument to be versatile, dependable and user friendly. The SynchroSonic U/50
provides the widely used therapeutic modality of ultrasound. The ultrasound may
beappliedseparatelyormaybecombinedwithelectricalstimulation simultaneously
through the ultrasound transducer using an external electrical stimulator.
Your SynchroSonic U/50 has been manufactured by a group of dedicated, highly
trainedemployees who exemplify theAmrextradition,since1935,of manufacturing
therapeutic equipment of the highest quality while supporting you with prompt,
courteous customer service.
UponreceiptofyourSynchroSonicU/50,verifyyouraccessoriesagainstthe 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
U/50. Should you have any 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 due
to misuse, alteration or abnormal condition of operation, including evidence that nonauthorized
personnelhaveattemptedto repair the device, the instrument will be repaired atcustomersexpense.
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,includingtheac line cord, must be included with the returnedinstrument.The customer
is responsible for all freight charges. The Manufacturer shall assume NO responsibility for damage
in transit.

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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
OPTIONAL FEATURE (1.0/3.3) AMREX Ultrasound Intensity Reset Circuit: The Ultrasound
modality incorporates a unique reset circuit feature as a part of the intensity control. The
ultrasound output will be disabled in the event that:
•The Ultrasound Intensity control is not set to the 0position at power on
•The ac power is interrupted
•The treatment period has been completed and the bell has sounded
•The the Ultrasound Frequency switch setting is changed during treatment
The Ultrasound Intensity control must be returned to the 0position before ultrasound output
can be activated.
Ultrasound—Contraindications
Ultrasound should not be used in the following areas: transcerebrally; near the heart or 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,
arteriosclerosisorweakenedbloodvessels,hemophilia, thrombosisandthrombophlebitiseither 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.
Any bleeding tendency is increased by heating because of the increase in blood flow and
vascularity of
the heated tissues. Care should be used in treating patients who have bleeding disorders.
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 performance of procedures,other than those specified
herein, may result in hazardous exposure to ultrasonic 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
•Safetyhasnot beenestablished for the use of electrical muscle stimulation during pregnancy
•Adequateprecautions should be takenin the case ofpersons with suspected heart problems
•Adequate precautions should be taken in the case of persons with suspected or diagnosed
epilepsy
•Donotstimulateoverthecarotidsinusnerves,especiallyinpatientswithaknownsensitivity
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.
Skin irritation and burns beneath the electrodes have been reported with the use of
electrical muscle stimulators.

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Table of Contents
Part 1
Overview ................................................................................................................................. 1
Part 2
Power Section......................................................................................................................... 5
Part 3
UltrasoundModality ............................................................................................................ 9
Part 4
U/50 General Operation and Application Procedures ................................................... 17
General Operation ..................................................................................................................... 17
Application of Ultrasound .......................................................................................................19
Adverse Effects - Shortwave Diathermy Interference ........................................................ 20
Ultrasound—Indications .......................................................................................................... 21
Ultrasound—Contraindications ............................................................................................. 22
Ultrasound—Precautions ......................................................................................................... 22
The Ultrasound Transducer..................................................................................................... 23
Transducer Cable Fault Alarm System .................................................................................. 23
QuickConnect Transducer Cable System (Optional Feature) ........................................... 24
Dual Transducers (Optional Feature) .................................................................................... 25
U/50 Combination Mode......................................................................................................... 26
Ultrasound Combined With MS322 Low Volt AC Muscle Stimulator ............................ 26
Control Settings and General Operation ....................................................................... 26
Application of Electrical Muscle Stimulation ...................................................................... 29
Adverse Effects - Shortwave Diathermy Interference ........................................................ 30
Electrical Muscle Stimulation—Indications .......................................................................... 31
Electrical Muscle Stimulation—Contraindications.............................................................. 31
Electrical Muscle Stimulation—Warnings............................................................................. 31
Electrical Muscle Stimulation—Precautions ......................................................................... 32
Appendix A
Specifications ....................................................................................................................... 33
Appendix B
References.............................................................................................................................. 35

vi

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

2U/50 User's Guide
Part 1
In the illustration below, dashed lines surround each of the U/50's sections.
A brief description of each section follows the illustration. Parts 2 and 3 of this
manual contain detailed descriptions of each section.