Surgery – Instruments – Cutting – puncturing or piercing
Patent
1994-07-22
1997-07-08
Tucker, Guy V.
Surgery
Instruments
Cutting, puncturing or piercing
604165, 604170, A61M 500
Patent
active
056455577
ABSTRACT:
A safety penetrating instrument includes a penetrating member having a sharp distal end, a safety member movable relative to the penetrating member to protect the sharp distal end of the penetrating member, a safety member extending mechanism, a penetrating member retracting mechanism, a locking mechanism, a biasing mechanism and a releasing mechanism. The extending mechanism moves the safety member distally to a safety member extended position where the safety member distal end is disposed distally of the penetrating member distal end while permitting the safety member to move proximally to a safety member retracted position. The retracting mechanism moves the penetrating member proximally to a retracted position where the penetrating member distal end is disposed proximally of the safety member distal end while permitting the penetrating member to move distally to a penetrating member extended position. The locking mechanism locks the safety member in the safety member retracted position to prevent movement of the safety member to the safety member extended position and locks the penetrating member in the penetrating member extended position. The bias mechanism biases one or both of the safety member and penetrating member distally upon introduction in the anatomical cavity while permitting proximal movement of the members during penetration of the anatomical cavity wall. The releasing mechanism is responsive to distal movement of one or both of the safety member and penetrating member for triggering release of the locking mechanism.
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