Operation device

Details Operation device Operation device

1991-12-23

1993-01-19

Cohen, Lee S.

Distillation: apparatus

Apparatus

Systems

128 24AA, 606 39, 606 45, 606170, 606171, 310316, 310325, A61B 1732, H01L 4108

Patent

active

051803631

ABSTRACT:
A surgical operation device comprising an ultrasonic piezoelectric transducer for generating ultrasonic vibrations, an oscillation feedback type oscillator for supplying high-frequency power to the ultrasonic transducer, a vibration transmitter connected to the ultrasonic transducer for transmitting and amplifying mechanical vibrations at an ultrasonic frequency, a suction unit and an irrigator. The ultrasonic transducer includes a bolted Langevin type transducer. The feedback circuit of the oscillation feedback type oscillator includes an oscillation voltage detector, a phase comparator, a low pass filter, a differential amplifier, and a voltage controlled oscillator. Thus, the mechanical resonant frequency can be traced in a wide range of fluctuations of a load on the vibration transmitter during vibration and vibrations can start an appropriate mechanical resonate frequency irrespective of the load status of the vibration transmitter at the start-up.

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patent: 4965532 (1990-10-01), Sakurai

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