18 OMNISOUND
®
3000C PRO USER MANUAL
COPYRIGHT © 2001 - 2017, ACCELERATED CARE PLUS CORP., ALL RIGHTS RESERVED
MODES OF OPERATION
History
The use of ultrasound in physical medicine dates back to the late 1930's (Pohlman, et al, 1939). After the Second
World War, great interest was shown in this technique and many technical papers were presented. By 1955, the
council on Physical Medicine and Rehabilitation of the American Medical Association recommended the technique
as an adjunctive therapy for the treatment of pain, soft tissue injury and joint dysfunction, including osteoarthritis,
periarthritis, bursitis, tenosynovitis and a variety of musculoskeletal syndromes. Ultrasound therapy is currently
used on a very frequent basis in physical medicine. The Omnisound
®
3000C Pro ultrasonic therapy system provides
the clinician with an accurately calibrated ultrasound source capable of operating in pulsed or continuous modes at
1.0 MHz or 3.0 MHz for therapeutic applications.
Theory of Operation
Ultrasonic therapy devices generally consist of a generator and a transducer. The generator produces the electrical
drive output to the transducer and provides measurement of its ultrasonic output. The transducer converts the
electrical energy from the generator into mechanical vibrations, known as ultrasonic vibrations. These vibrations are
then coupled to the patient's tissue via a coupling medium such as ultrasonic gel, water or mineral oil. When
electrostimulation is used simultaneously with ultrasound through the transducer the coupling medium must also be
conductive.
SCHEMATIC REPRESENTATION OF A TYPICAL ULTRASOUND GENERATOR
Typically therapeutic ultrasound generators operate in the 500 kHz to 3.5 MHz range. The frequency of the
ultrasonic wave will determine the absorption by the tissue and thus the penetration of the beam in the tissue.
Output intensities of 0.1 - 3 watts/cm
2
are typically applied for therapeutic purposes in pulsed or continuous wave
modes.
