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Surgical instrument

  • US 4,832,683 A
  • Filed: 05/15/1987
  • Issued: 05/23/1989
  • Est. Priority Date: 09/20/1985
  • Status: Expired due to Term
First Claim
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1. A surgical instrument for cutting and separating biological tissue by employing ultrasonic vibration comprising:

  • an ultrasonic vibration-transmitting tool adapted to perform mechanical vibration at the frequency of the ultrasonic waves;

    said ultrasonic vibration-transmitting tool including a spoon-shaped working portion adapted to be brought into contact with the biological tissue;

    said spoon shaped working portion having a peripheral wall and a bottom wall and having a mortar-like recess;

    said ultrasonic vibration-transmitting tool further including a liquid passage passing through the interior of said tool and having at its one side an opening which opens into a bottom portion of said working portion surrounded by said peripheral wall and which has an area smaller than an area of said bottom wall; and

    a blade-shaped portion provided at a top end of at least a side of said peripheral wall which forms an angle with respect to the direction of mechanical vibration at the frequency of the ultrasonic waves and a side thereof parallel with said direction of the mechanical vibration.

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