Patent ID: 7270646

Claim:
An ultrasonic operation system comprising: an ultrasonic transducer for generating ultrasonic oscillations to treat a living tissue; a handpiece having a probe connected to said ultrasonic transducer for transmitting the ultrasonic oscillations generated by said ultrasonic transducer; a driving signal oscillator including a frequency data input unit that inputs digital frequency data, and producing a driving signal, based on which said ultrasonic transducer is driven, according to said digital frequency data; an amplification circuit for amplifying said driving signal and outputting the resultant driving signal to said ultrasonic transducer; a detection circuit for detecting the phase of a voltage applied based on the driving signal to said ultrasonic transducer and the phase of a current induced with the voltage; a phase comparison circuit for comparing a signal of the phase of the voltage with a signal of the phase of the current detected by said detection circuit to output a phase difference signal; a data transfer circuit for transferring digital frequency initial data which is substantially the resonance frequency of said handpiece; and an arithmetic circuit for varying the digital frequency initial data transferred from said data transfer circuit according to the phase difference signal from said phase comparison circuit, wherein said arithmetic circuit counts the digital data according to the phase difference signal, calculates the digital data counted and the digital frequency initial data, and outputs the result of calculation to said frequency data input unit.