Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1994-06-15
1995-06-13
Hirsch, Paul J.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604158, 604170, A61M 500
Patent
active
054237602
ABSTRACT:
A retractable safety penetrating instrument includes a cannula, a penetrating member disposed within the cannula and a hub mounting proximal ends of the penetrating member and the cannula. The penetrating member is movable to an operative state to penetrate tissue wherein a sharp tip of the penetrating member extends beyond a distal end of the cannula, and is arranged to be moved to a retracted position with the sharp tip of the penetrating member disposed within the cannula in a safe, protected position upon penetrating through the tissue. The penetrating member is selectively movable to various extended positions following retraction such that the sharp tip of the penetrating member can be positioned in an anatomical cavity to perform various medical procedures. The cannula can include various distensible, expandable or shape changing devices automatically positioned in response to retraction of the penetrating member to stabilize or hold the instrument within an anatomical cavity. A method of performing surgical procedures includes the steps of automatically retracting a sharp tip of the penetrating member within a cannula, moving the penetrating member distally to cause the sharp tip to protrude beyond a distal end of the cannula and performing a procedural step with the penetrating member.
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