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Trocar having movable blade

  • US 5,690,664 A
  • Filed: 09/18/1996
  • Issued: 11/25/1997
  • Est. Priority Date: 09/13/1993
  • Status: Expired due to Term
First Claim
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1. A surgical apparatus comprising:

  • a cannula;

    an obturator configured for insertion into the cannula, the obturator having a proximal portion and a distal portion;

    a tissue cutting member mounted to the distal portion of the obturator and movable between deployed and non-deployed positions; and

    an actuating mechanism operatively associated with the tissue cutting member, the actuating mechanism being selectively controllable for moving the tissue cutting member between the deployed and non-deployed positions independent of the position of the obturator;

    wherein movement of the actuating mechanism to a cutting member deployment position causes the cutting member to move to the deployed position, the actuating mechanism at the cutting member deployment position also automatically retracts the cutting member to the non-deployed position, wherein the actuating mechanism cannot maintain the cutting member in the deployed position as each deployment of the cutting member causes automatic retraction of the cutting member.

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