Ultrasound power generating system with sampled-data frequency control

摘要

A system is provided for applying ultrasound power to treat human tissue comprising a transducer driven by an oscillating signal from a power amplifier. The transducer and power amplifier have a power- conversion-efficiency characteristic which is a function of the frequency of the oscillating signal and the acoustic load on the transducer. Data sampling and frequency adjustment means are provided which continually monitor the current supplied to the crystal and adjust the frequency of the oscillating signal to maximize the power-conversion-efficiency of the transducer and power amplifier.