Surgery – Instruments – Cutting – puncturing or piercing
Patent
1995-01-18
1996-12-17
Tucker, Guy V.
Surgery
Instruments
Cutting, puncturing or piercing
604165, 604170, A61M 570
Patent
active
055848494
ABSTRACT:
A safety penetrating instrument for establishing a portal in the wall of an anatomical cavity includes a housing, a portal sleeve either fixed or distally-biased relative to the housing, a penetrating member disposed within the portal sleeve, a distally-biased safety shield disposed between the portal sleeve and the penetrating member, a retracting mechanism for moving the penetrating member proximally from a penetrating member extended position to a penetrating member retracted position, a locking mechanism for locking the penetrating member in the penetrating member extended position, and a releasing mechanism responsive to penetration of the safety penetrating instrument into the anatomical cavity for triggering release of the locking mechanism to permit the retracting mechanism to move the penetrating member proximally to the penetrating member retracted position. The locking mechanism can either prevent proximal movement of the penetrating member during penetration or permit a predetermined amount of proximal movement of the penetrating member during penetration of the anatomical cavity wall, in which case a penetrating member bias mechanism can be provided for biasing the penetrating member distally in the locked penetrating member extended position.
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