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Safety needle instrument with movable cannula and needle

  • US 5,665,072 A
  • Filed: 01/11/1995
  • Issued: 09/09/1997
  • Est. Priority Date: 11/27/1991
  • Status: Expired due to Fees
First Claim
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1. A safety needle instrument for establishing a portal in the wall of an anatomical cavity comprisinga housing;

  • an elongate cannula having a proximal end mounted by said housing and a distal end for introduction in the anatomical cavity, said cannula being movable relative to said housing during penetration between an extended rest position and a retracted position;

    cannula bias means for biasing said cannula distally relative to said housing toward said rest position;

    a needle disposed within said cannula and having a distal end for penetrating the anatomical cavity wall, said needle being movable relative to said housing between an extended position and a retracted position where said needle distal end is proximally spaced from said cannula distal end;

    retracting means for moving said needle from said needle extended position to said needle retracted position;

    means for manually moving said needle from said needle retracted position to said needle extended position;

    locking means for locking said needle in said needle extended position while permitting a predetermined amount of proximal movement of said needle relative to said housing during penetration of the anatomical cavity wall;

    needle bias means for biasing said needle distally relative to said housing in said needle extended position while permitting proximal movement of said needle during penetration of the anatomical cavity wall; and

    releasing means responsive to penetration of said safety needle instrument into the anatomical cavity for triggering release of said locking means to permit said retracting means to move said needle proximally to said needle retracted position.

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