Ultrasonic therapy instrument model CSL-1 uses electronic tube to generate ultrasonic vibration and power output which are converted to the ultrasonic mechanical energy with the same frequency by means of the ultrasonic energy converter, or probe. The mechanical effect of ltrasound on the human tissues is a combined process, which includes the direct effect on human tissues during the conversion of vibration energy to mechanical and heat energy, as well as the indirect response of human tissues to this action