×

Penetrating instrument having an expandable anchoring portion for triggering protrusion of a safety member and/or retraction of a penetrating member

  • US 5,882,340 A
  • Filed: 07/02/1997
  • Issued: 03/16/1999
  • Est. Priority Date: 04/15/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A penetrating instrument for penetrating an anatomical cavity wall to gain access to an anatomical cavity comprisinga cannula having a distal end for being disposed in the anatomical cavity, a proximal end for being disposed externally of the anatomical cavity and a longitudinal axis;

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

    an expandable portion disposed along said cannula a predetermined distance from said cannula distal end, said expandable portion being biased outwardly in a lateral direction transverse to said longitudinal axis to an expanded position and being movable inwardly in said lateral direction from said expanded position to a contracted position against said bias automatically in response to a force from tissue contact during penetration of the anatomical cavity wall to facilitate introduction of said cannula distal end in the anatomical cavity, said expandable portion further being biased to move outwardly in said lateral direction from said contracted position to said expanded position automatically in response to a reduction in force from tissue contact upon introduction of said expandable portion in the anatomical cavity to anchor said cannula to protrude into the anatomical cavity a distance corresponding to said predetermined distance.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×