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Safety penetrating instrument with safety member and cannula moving during penetration and triggered cannula and/or safety member protrusion

  • US 5,573,545 A
  • Filed: 09/30/1994
  • Issued: 11/12/1996
  • Est. Priority Date: 06/24/1993
  • Status: Expired due to Fees
First Claim
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1. A safety penetrating instrument for establishing a portal in the wall of an anatomical cavity comprisinga housing;

  • an elongate cannula mounted by said housing and having a distal end for introduction in the anatomical cavity and a proximal end for positioning externally of the anatomical cavity;

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

    a safety member disposed within said cannula and having a distal end, said safety member being movable relative to said housing between an extended rest position and a safety member retracted position relative to said penetrating member distal end;

    cannula extending means for moving said cannula distally relative to said housing from a retracted position where said cannula distal end is disposed proximally of said penetrating member distal end to an extended position where said cannula distal end protrudes distally from said penetrating member distal;

    means for manually moving said cannula proximally relative to said housing from said cannula extended position to said cannula retracted position;

    cannula locking means for locking said cannula in said cannula retracted position to prevent distal movement of said cannula relative to said housing beyond said cannula retracted position while permitting proximal movement of said cannula relative to said housing during penetration of the anatomical cavity wall;

    cannula bias means for biasing said cannula distally relative to said housing in said cannula retracted position to permit said cannula to move proximally relative to said housing from said cannula retracted position during penetration of the anatomical cavity wall and distally relative to said housing toward said cannula retracted position upon introduction into the anatomically cavity;

    safety member bias means for biasing said safety member distally relative to said housing toward said safety member rest position and for permitting proximal movement of said safety member relative to said housing during penetration of the anatomical cavity; and

    releasing means responsive to penetration of said safety penetrating instrument into the anatomical cavity for triggering release of said cannula locking means to permit said cannula extending means to move said cannula distally relative to said housing from said cannula retracted position to said cannula extended position.

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