Patent ID: 6761690
Filing Date: 2004-07-13
Classification: A61B,B06B

Abstract:
An ultrasonic operation system comprising:a handpiece including an ultrasonic transducer, which treats a living tissue using ultrasonic oscillations generated by the ultrasonic transducer; a driving signal oscillator for producing a driving signal for driving the ultrasonic transducer and supplying the driving signal to the handpiece; a sweep circuit for sweeping a frequency of the driving signal; a data transfer circuit for transferring start frequency data to the sweep circuit to start sweeping the frequency of the driving signal; a detection circuit for detecting a resonance frequency of the handpiece based on the driving signal of which the frequency has been swept by the sweep circuit; and a phase lock loop (PLL) circuit for locking the frequency of an output current onto the resonance frequency; and a switch for switching between the PLL circuit and the sweep circuit according to a detection result from the detection circuit.