A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
128/111
A61B 17/00 (2006.01) A61B 17/32 (2006.01) B06B 1/02 (2006.01) B06B 3/00 (2006.01) A61B 18/00 (2006.01) A61B 18/12 (2006.01) A61F 9/007 (2006.01) A61M 3/02 (2006.01)
Patent
CA 2000581
ABSTRACT OF THE DISCLOSURE 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 amplify- ing 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 resonant frequency irrespective of the load status of the vibration transmitter at the start-up.
Idemoto Morito
Inoue Naohiko
Noguchi Yasuo
Fetherstonhaugh & Co.
Sumitomo Bakelite Company Limited
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