Polypectomy snare instrument
First Claim
1. A surgical snare instrument, comprising:
- a) an elongate flexible tubular sheath having proximal and distal ends, said distal end defining a longitudinal axis;
b) a flexible shaft having proximal and distal ends, said flexible shaft extending through and axially movable relative to said sheath;
c) a snare loop provided at said distal end of said flexible shaft, wherein when said snare loop extends beyond said distal end of said tubular sheath in a first position said snare loop has a proximal portion which extends non-axially relative to said longitudinal axis and a distally-directed distal portion which is angled relative to said proximal portion and extends substantially parallel to said longitudinal axis; and
d) a handle assembly coupled to said shaft and said sheath, said handle assembly configured to move at least one of said shaft and said sheath axially relative to the other.
1 Assignment
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Accused Products
Abstract
A surgical snare instrument includes a tubular sheath having proximal and distal ends, a flexible shaft having proximal and distal ends extending through and axially movable relative to the sheath, a snare loop at the distal end of the shaft, and a handle assembly coupled to the proximal ends of the sheath and shaft for moving the shaft axially relative to the sheath. The handle assembly is provided with cautery capability to provide a cautery current to the snare loop. The snare loop is trained to have a proximal portion which extends along an angle or curve relative to the tubular member and a distal portion which is substantially parallel to the tubular member. As such, when the snare loop is axially moved beyond the distal end of the sheath, the distal portion of the snare loop; i.e., that portion which is adapted to engage a polyp, is oriented substantially parallel, yet non-axial, with the tubular member. According to one embodiment of the invention, the shaft is torqueable, preferably made from a multifilament twisted and drawn or swaged cable. The handle is preferably additionally adapted to axially rotate the sheath relative to the shaft and the snare loop to facilitate maneuvering the snare loop. According to another embodiment of the invention, the snare loop is provided with a net element adapted to capture a polyp severed by the snare loop.
225 Citations
23 Claims
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1. A surgical snare instrument, comprising:
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a) an elongate flexible tubular sheath having proximal and distal ends, said distal end defining a longitudinal axis; b) a flexible shaft having proximal and distal ends, said flexible shaft extending through and axially movable relative to said sheath; c) a snare loop provided at said distal end of said flexible shaft, wherein when said snare loop extends beyond said distal end of said tubular sheath in a first position said snare loop has a proximal portion which extends non-axially relative to said longitudinal axis and a distally-directed distal portion which is angled relative to said proximal portion and extends substantially parallel to said longitudinal axis; and d) a handle assembly coupled to said shaft and said sheath, said handle assembly configured to move at least one of said shaft and said sheath axially relative to the other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A surgical snare instrument, comprising:
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a) an elongate flexible tubular sheath having proximal and distal ends, said distal end having a longitudinal axis; b) a flexible shaft having proximal and distal ends, said flexible shaft extending through and axially movable relative to said sheath; c) a snare loop provided at said distal end of said flexible shaft, said snare loop having a proximal portion biased to extend non-axially relative to said longitudinal axis and a distally-directed distal portion biased to extend substantially parallel to said longitudinal axis; and d) a handle assembly coupled to said sheath and said flexible shaft and configured to move at least one of said shaft and said sheath axially relative to the other. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification
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- Resources
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Current AssigneeGeneral Science Technology Corporation
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Original AssigneeGeneral Science Technology Corporation
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InventorsAvellanet, Francisco J.
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Primary Examiner(s)Mancene, Gene
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Assistant Examiner(s)Priddy, Michael B.
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Application NumberUS09/264,772Time in Patent Office315 DaysField of Search606/113, 606/114, 606/110, 606/131, 606/47, 606/37, 606/108, 604/22US Class Current606/113CPC Class CodesA61B 18/14 Probes or electrodes thereforA61B 2017/00867 shape memory effect for pro...A61B 2018/1407 LoopC08L 2201/12 Shape memory
