The equipment used for ultrasound therapy consists of a generator of high frequency current and an applicator, usually referred to as a “transducer”. The generator produces an electrical current of desired frequency which causes a crystal in the transducer to vibrate rapidly, producing sound waves. The ultrasonic energy is transmitted to human tissue by contact with the transducer. However, ultrasonic energy cannot be transmitted through the air, so a coupling medium must be used between the transducer and the skin. Different media are water, oil, and transmission gel.
Continuous ultrasound means that the ultrasonic waves are constantly emitted from the transducer. This form of ultrasound is used over thick tissue and requires constant movement of the transducer over the area being treated. Pulsed ultrasound means that the ultrasonic waves are emitted intermittently. This method is used in areas where underlying bone is covered by a relatively thin layer of tissue. The transducer is kept stationary throughout the treatment.
PHYSIOLOGICAL EFFECTS
- Increase blood
- Raise tissue
- Increase calcium
- Increases pain threshold, therefore· decreasing
INDICATIONS
- Acute and chronic
- Sprains and strains
- Bursitis, tendonitis,
- Adhesive capsulitis (frozen shoulder)