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Safety penetrating instrument

  • US 5,549,564 A
  • Filed: 06/07/1993
  • Issued: 08/27/1996
  • Est. Priority Date: 12/18/1990
  • Status: Expired due to Fees
First Claim
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1. A safety penetrating instrument comprisingan elongate penetrating member having a distal end defining a sharp tip for penetrating tissue;

  • a safety member movably disposed relative to said penetrating member having a distal end and being movable between an extended position with said safety member distal end protruding distally from said penetrating member sharp tip and a retracted position with said safety member distal end disposed proximally of said penetrating member sharp tip to expose said penetrating member sharp tip;

    an elongate, tubular portal sleeve receiving said penetrating member and having a distal end disposed adjacent said penetrating member distal end;

    bias means for biasing said safety member toward said extended position and for permitting said safety member to move to said retracted position and returning said safety member to said extended position; and

    releasable locking means for automatically locking said safety member in said extended position after said safety member is returned to said extended position, said releasable locking means including means extending from said safety member for permitting said safety member to be pulled back from said extended position against the force from said bias means to expose said penetrating member sharp tip without requiring a force applied in a proximal direction to said safety member distal end.

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