Retractable cannula for surgical procedures
AssigneeSuremka Medical, LLC
InventorsDaniel A. Worrel, Joshua S. Redstone
Life of this patent
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Abstract
A cannula assembly having a plurality of outwardly-biased flexible fins capable of inward movement such that the fins converge upon insertion of a trocar device. The fins include a slot formed therein, with a corresponding raised feature on the trocar shaft capable of engaging the slots. Inward movement of the trocar within the cannula lumen causes the fins to converge. An additional embodiment utilizes outwardly-biased flexible fins that lock together in a closed position, with corrugated features in the fin inner surface that contact the trocar shaft such that, upon insertion of the trocar, the fins unlock and splay outward.
Claims24
A cannula assembly, the assembly comprising:
- a body member including a proximal end, a distal end, and a lumen extending therebetween, the distal end including a plurality of outwardly-biased flexible fins extending therefrom, each fin capable of inward movement such that the fins converge, each fin further including a wall formed from an inner surface and an edge surface extending from the inner surface to an outer surface, and at least one longitudinal slot formed within the fin wall and extending to a surface;
- and
- a trocar device including a proximal end and a shaft extending therefrom to form a distal end, the shaft member including at least one raised member per fin slot, each raised member being radially disposed proximate the distal end, the shaft member capable of insertion into the lumen, wherein insertion of the shaft within the lumen engages the raised members with the fin slots causing inward movement of the fins.
A cannula assembly, the assembly comprising:
- a body member including a proximal end, a distal end, and a lumen extending therebetween, the distal end including a plurality of outwardly-biased flexible fins extending therefrom, each fin capable of inward movement such that the fins converge, each fin further including a wall formed from an inner surface and an edge surface extending from the inner surface to an outer surface, and at least one longitudinal slot formed within the wall and edge surface;
- and
- a trocar device including a proximal end and a shaft extending therefrom to form a distal end, the shaft member including at least one raised member per fin slot, each raised member being radially disposed proximate the distal end, each raised member cross section approximating the shape the fin slots, the shaft member capable of insertion into the lumen, wherein insertion of the shaft within the lumen engages the raised members with the fin slots causing inward movement of the fins such that the fins converge.
A cannula assembly, the assembly comprising:
- a body member including a proximal end, a distal end, and a lumen extending therebetween, the distal end including a plurality of outwardly-biased flexible fins extending therefrom, one fin including a locking feature at its distal end, wherein the other fins may be captured beneath the locking feature closing off the lumen;
- a trocar device including a proximal end and a shaft member extending therefrom to form a distal end, the shaft member capable of insertion into the lumen;
- and
- an anti-plunging device removably attachable to the shaft member wherein the attached anti-plunging device blocks the shaft member from advancing past a first position within the lumen, and wherein removal of the anti-plunging device allows the shaft member to advance past the first position to a second position wherein the fins unlock and move outward.
Dependencies are inferred from the claim text.