Therapy
In 1994, SRA Developments developed the first therapeutic ultrasound machine in the 44-48 kHz range – the Phys-Assist. It quickly became a well-established device, used as a safe and highly effective alternative to the more traditional megahertz machines.
Utilizing low frequency, long wavelength energy, the Phys-Assist is able to simultaneously treat both the superficial and deep tissues with minimal energy output. Rather than all the ultrasonic energy being absorbed within the first 10mm of the skin’s surface, the longwave energy is able to penetrate much more deeply.
The DuoSon was introduced in 1997 to supersede the Phys-Assist and was the first machine to combine low and high frequency in one device. It has a unique handset designed to give combinations of output frequencies and energies.
Both the DuoSon and Phys-Assist are used to complement the treatment of both acute and chronic soft tissue injuries. Typical injuries that can be treated include:
Torticollis, Cervical Spondylosis, Low Back Pain, Sacro-illac Strain, Tennis Elbow, Golfer's Elbow, Frozen Shoulder, Teno Synovitis, Groin Strain, Ankle Sprain, Muscle Haematoma, Traumatic Contusions, Muscle Spasm, Tendonitis
Clinical papers:
To read about the efficacy of longwave ultrasound on a typical indication:
Bradnock, Law, Roscor. A quantitive comparative assessment of the immediate response to high frequency ultrasound and low frequency ultrasound (longwave therapy) in the treatment of acute ankle sprains. Physiotherapy 1996; 82; 78-84
For a more fundamental look at the action of ultrasound on cell regeneration, read:
Reher, Doan, Bradnock, Meghji, Harris. Effect of Ultrasound on the production of IL-8, Basic FGF and VEGF. 1999 Academic Press 1043-4666/99/060416+08
As with OSCAR, SRA Developments is the manufacturer of both the DuoSon and Phys-Assist machines. The intellectual property, manufacturing and exclusive marketing rights are owned by Orthosonics Ltd (part of the Orthofix group). For more detailed information on these products, visit the Orthosonics website.