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Automatic retractable safety penetrating instrument

  • US 5,360,405 A
  • Filed: 08/14/1992
  • Issued: 11/01/1994
  • Est. Priority Date: 11/27/1991
  • Status: Expired due to Fees
First Claim
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1. An automatic retractable safety penetrating instrument for introducing a sleeve into a cavity in the body comprisingsleeve means for providing a passage through a cavity wall and having a distal end for positioning in the body cavity, a proximal end for positioning externally of the body cavity and a lumen extending between said distal and proximal sleeve means ends;

  • a penetrating member disposed in said lumen of said sleeve means and having a longitudinal axis and a sharp distal end for penetrating the cavity wall;

    retracting means for moving said sharp distal end of said penetrating member proximally relative to said sleeve means from an extended position where said sharp distal end protrudes beyond said sleeve means distal end to a retracted position to prevent contact of said sharp distal end with tissue; and

    locking and releasing means mounted for axial rotation relative to said penetrating member and about said longitudinal axis for automatically actuating said retracting means to move said sharp distal end of said penetrating member to the retracted position in response to axial rotation of said locking and releasing means automatically upon said sleeve means distal end entering the body cavity.

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