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Safety penetrating instrument with triggered penetrating member retraction and single or multiple safety member protrusion

  • US 5,645,556 A
  • Filed: 07/22/1994
  • Issued: 07/08/1997
  • Est. Priority Date: 12/18/1990
  • Status: Expired due to Fees
First Claim
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1. A safety penetrating instrument for establishing a portal in a wall of an anatomical cavity comprisinga housing;

  • a cannula mounted by said housing and having a distal end for positioning within the anatomical cavity, a proximal end for positioning externally of the anatomical cavity wall and a lumen extending between said distal and proximal ends of said cannula;

    a penetrating member disposed in said cannula and having a distal end for penetrating the anatomical cavity wall;

    a safety member movable relative to said housing between a safety member retracted position exposing said distal end of said penetrating member and a safety member extended position placing said distal end of said penetrating member in a protected, non-exposed state;

    retracting means for moving said penetrating member proximally relative to said housing from a penetrating member extended position to a penetrating member retracted position;

    extending means for moving at least one of said cannula and said safety member distally relative to said housing from a retracted position to an extended position;

    locking means for locking said penetrating member in said penetrating member extended position and at least one of said cannula and said safety member in said retracted position to prevent distal movement thereof relative to said housing beyond said retracted position; and

    releasing means responsive to entry of said safety penetrating instrument into the anatomical cavity for triggering release of said locking means to permit said retracting means to move said penetrating member proximally relative to said housing from said penetrating member extended position to said penetrating member retracted position and to permit said extending means to move at least one of said cannula and said safety member distally relative to said housing from said retracted position to said extended position to protect said distal end of said penetrating member.

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