Surgery – Instruments – Cutting – puncturing or piercing
Patent
1994-09-30
1997-03-04
Tucker, Guy V.
Surgery
Instruments
Cutting, puncturing or piercing
604165, 604170, A61M 500
Patent
active
056074395
ABSTRACT:
A safety penetrating instrument for penetrating an anatomical cavity wall to gain access to an anatomical cavity includes a cannula, a penetrating member having a distal end for penetrating an anatomical cavity wall to gain access to an anatomical cavity, and a safety member in the form of a safety shield or probe. The penetrating member is mounted on a bias member for biasing the penetrating member distally toward a rest position while allowing proximal movement of the penetrating member away from the rest position. Both the safety member and the cannula have distal ends movable between respective extended positions disposed distally of the penetrating member distal end to protect the penetrating member distal end and respective retracted positions disposed proximally of the penetrating member distal end to expose the penetrating member distal end. Extending mechanisms move the safety member and cannula distally to their respective extended positions and permit the safety member and cannula to move proximally to their respective retracted positions. The safety member and cannula are locked in the retracted positions to prevent movement to the extended positions during penetration of the anatomical cavity wall and are released responsive to movement of the penetrating member distally toward the rest position upon penetration into the anatomical cavity.
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