Ultrasonic surgical device
First Claim
1. An ultrasonic surgical device having an ultrasonic oscillation circuit and an ultrasonic transducer with an electrostriction type vibrator, said oscillation circuit comprising:
- power supply means including a rectifier circuit means for converting AC current from an AC power source into DC current,means for connecting said AC power source and said rectifier circuit means to reduce rush current from said AC power source to said rectifier circuit means;
a smoothing circuit means connected to said rectifier circuit means for reducing ripples of the DC current;
a power amplifier circuit means connected to said smoothing circuit means to produce an amplified electric signal,means connected to said amplifier circuits means for suppressing spike wave of the amplified electric signal,matching-circuit means connected to said spike-suppressing means for supplying an electric signal of a reduced loss to said ultrasonic transducer in response to load increase thereof,means connected to said matching-circuit means for setting an amplitude level of the supplied electric signal to stably operate said transducer with a low loss,means for connecting said amplitude-level setting means and said transducer to drive said transducer and produce a feedback signal,means for feeding back the feedback signal to said power amplifier circuit means, said feedback means including quality-factor adjusting means and feedback signal filtering means for filtering out spurious frequency signals,means connected to said power amplifier circuit means to adjust the amplitude of said amplified electric signal, andstarting-impulse reducing means connected between said smoothing circuit means and said power amplifier circuit means to reduce the impulse of the DC current to the latter at start of oscillation.
1 Assignment
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Accused Products
Abstract
An ultrasonic oscillation device adapted for use in surgical operations includes, for the purpose of producing ultrasonic vibrations of an amplitude and power capable of exhibiting a satisfactory tissue shattering capacity in a wide field of living tissues, an ultrasonic oscillation section having a power amplifier circuit for adjusting the amplitude of its output without any difference in phase between the output and a feedback signal, and a starting impulse reducing circuit for reducing the impulse due to a transient current upon the starting of oscillation. Also, an ultrasonic transducer includes an electrostriction type transducer and a horn, and the horn forming a scalpel portion is provided with a suction opening adapted for irrigating an affected part operated on and its surrounding, floating shattered cellular pieces and sucking and removing the floating cellular pieces.
161 Citations
9 Claims
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1. An ultrasonic surgical device having an ultrasonic oscillation circuit and an ultrasonic transducer with an electrostriction type vibrator, said oscillation circuit comprising:
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power supply means including a rectifier circuit means for converting AC current from an AC power source into DC current, means for connecting said AC power source and said rectifier circuit means to reduce rush current from said AC power source to said rectifier circuit means; a smoothing circuit means connected to said rectifier circuit means for reducing ripples of the DC current; a power amplifier circuit means connected to said smoothing circuit means to produce an amplified electric signal, means connected to said amplifier circuits means for suppressing spike wave of the amplified electric signal, matching-circuit means connected to said spike-suppressing means for supplying an electric signal of a reduced loss to said ultrasonic transducer in response to load increase thereof, means connected to said matching-circuit means for setting an amplitude level of the supplied electric signal to stably operate said transducer with a low loss, means for connecting said amplitude-level setting means and said transducer to drive said transducer and produce a feedback signal, means for feeding back the feedback signal to said power amplifier circuit means, said feedback means including quality-factor adjusting means and feedback signal filtering means for filtering out spurious frequency signals, means connected to said power amplifier circuit means to adjust the amplitude of said amplified electric signal, and starting-impulse reducing means connected between said smoothing circuit means and said power amplifier circuit means to reduce the impulse of the DC current to the latter at start of oscillation. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9)
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6. An ultrasonic surgical device as set forth in claim 6, wherein a material of said horn comprises a titanium alloy.
Specification