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
056455569
ABSTRACT:
A safety penetrating instrument for establishing a portal in a wall of an anatomical cavity includes a cannula, a penetrating member disposed within the lumen of the cannula, a safety member movable relative to the penetrating member to place the tip of the penetrating member in a protected, non-exposed state, and various mechanisms for simultaneously retracting the penetrating member while extending one or both of the cannula and safety member from locked positions wherein the penetrating member is in an extended position and the cannula and safety member are in retracted positions. Retraction of the penetrating member and extension or protrusion of either or both of the safety member and portal sleeve is triggered individually or in combination by movement of one or more of the three members upon entering the anatomical cavity. Additionally, a probe can be carried by the safety penetrating instrument for triggering retraction and/or extension of the members in a similar manner or upon moving a predetermined proximal distance during penetration of the anatomical cavity wall.
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