Patent ID: 8858439

Claim:
An ultrasound operation apparatus for treating a living tissue, comprising: an ultrasound transducer configured to generate ultrasound vibrations; a probe having a proximal end section that is operationally coupled with the ultrasound transducer, and a distal end section configured to emit the ultrasound vibrations, the probe being configured to transmit the ultrasound vibrations generated by the ultrasound transducer from the proximal end section to the distal end section; a resonance frequency tracking section configured to adjust a frequency of a drive signal to track a resonance frequency of the ultrasound transducer to cause the distal end section to emit ultrasound vibrations at the resonance frequency; a setting section configured to set a setting value at a cavitation level; a detection section configured to detect a signal level of a frequency component signal obtained by integration of the drive signal in a predetermined frequency band excluding the resonance frequency based on the drive signal adjusted by the resonance frequency tracking section; and a control section configured to control an output of the drive signal to suppress or eliminate a cavitation, based on the setting value in accordance with the signal level of the frequency component signal.