Single blade cutter for arthroscopic surgery
First Claim
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1. A surgical instrument for cutting tissue comprising:
- a cylindrical tube having an open distal end and a side window formed in its distal end through which tissue may enter said tube for cutting;
a tissue cutter head rotatable within said tube relative to said open end and said window, said cutter head including;
(i) a cylindrical base portion having a radial surface closely conforming to the inside surface of said tube;
(ii) a sole blade located along one circumferential side of and extending distally from said base portion and bearing a first and a second cutting edge, said first cutting edge disposed on said blade for traveling in a cylindrical locus closely adjacent to the inside surface of said tube relative to said window for passing across one edge of said window during at least a portion of the rotation of said cutter head for cutting tissue protruding laterally through said window, and said second cutting edge for cutting tissue protruding axially through said distal end, said first and second cutting edges meeting in a sole point, said sole point being the most distal point of said cutter head, and(iii) a sole debris channel formed by a cavity in said cutter head and passing through said base portion for receiving tissue severed by said first and second cutting edges.
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Abstract
A surgical instrument having a tube and a rotating cutter head. The cutter head has a sole blade bearing two cutting edges extending from a cylindrical base and meeting in a point. An helical debris channel follows from the blade point through the cylindrical base so that large pieces of tissue may be cut and carried away by suction within the tube.
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Citations
8 Claims
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1. A surgical instrument for cutting tissue comprising:
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a cylindrical tube having an open distal end and a side window formed in its distal end through which tissue may enter said tube for cutting; a tissue cutter head rotatable within said tube relative to said open end and said window, said cutter head including; (i) a cylindrical base portion having a radial surface closely conforming to the inside surface of said tube; (ii) a sole blade located along one circumferential side of and extending distally from said base portion and bearing a first and a second cutting edge, said first cutting edge disposed on said blade for traveling in a cylindrical locus closely adjacent to the inside surface of said tube relative to said window for passing across one edge of said window during at least a portion of the rotation of said cutter head for cutting tissue protruding laterally through said window, and said second cutting edge for cutting tissue protruding axially through said distal end, said first and second cutting edges meeting in a sole point, said sole point being the most distal point of said cutter head, and (iii) a sole debris channel formed by a cavity in said cutter head and passing through said base portion for receiving tissue severed by said first and second cutting edges.
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2. A surgical instrument for cutting tissue comprising:
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a cylindrical tube having a central axis, an open end defined by a distal tube edge generally lying in a plane perpendicular to the tube axis, and a side window extending generally axially from the distal tube edge; said side window being defined by first and second generally straight window side edges extending from corners formed with said distal tube edge and terminating at a proximal boundary of said side window; a tissue cutter head rotatable within the tube and positioned within the tube generally adjacent to the side window having; a radial surface closely conforming to the tube; a debris channel defining a generally helical path along the radial surface and extending proximally beyond the proximal boundary of said side window of the tube and opening within the tube; said debris channel defining a proximal channel edge and a distal channel edge in the radial surface; a generally spiral distal surface bounded by an intersection with the debris channel to form a distal debris channel boundary and an intersection with the radial surface that forms a helical distal radial surface boundary from a farthest distal extent adjacent to the distal tube edge at an intersection with the distal channel edge to a proximal extent at an intersection of the proximal channel edge at a location lying in the plane of the proximal side window boundary; the debris channel and the distal surface having converging helical profiles to intersect at the farthest distal extent of the cutter at the radial surface to form a piercing point at the intersection of the distal radial surface boundary and the proximal channel edge; the distal surface and debris channel intersecting at the distal debris channel boundary to form a distal cutting edge;
whereby, rotation of the single blade cutter within the tube causes the cutting point to approach a corner defined by the distal tube edge and a side edge, further rotation of the single flute cutter causes the cutting point to rotate past the corner and the distal channel edge to continuously pass the side edge and a location of the passing of the distal channel edge and side edge becomes farther proximal from the distal tube edge with rotation of the single blade cutter causing a shearing action between the distal channel edge and the side edge and rotation of the cutter rotates the distal cutting edge and cutting of tissue entering the open distal end of the tube. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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Specification