Surgical cutting instrument
First Claim
1. A surgical cutting instrument for cutting anatomical tissue comprisingan elongate outer tubular member having a proximal end, a distal end and a longitudinal axis;
- cutting port means at said distal end for receiving anatomical tissue;
an elongate inner tubular member having a proximal end and a distal end;
tissue cutting means on said inner member distal end including a plurality of straight-sided triangular cutting teeth linearly aligned parallel with said axis; and
mounting means for securing said inner member coaxially within said outer member to permit selective rotation of said inner member relative to said outer member, wherein the distal end of said inner member is in engagement with the distal end of said outer member, and wherein said cutting means is positioned to cut anatomical tissue received through said cutting port means when said inner member is rotated in said outer member.
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Accused Products
Abstract
The cutting strength of a rotary surgical cutting instrument is increased by an on-axis bearing contact between the distal end of its rotatable inner member and the interior surface of its outer member. The outer member is provided with a distal cutting aperture angularly oriented to the rotation axis and circumscribed by an oval outer cutting edge. The inner member has two symmetrical rows of straight-sided triangular cutting teeth positioned to cooperate with the outer cutting edge to shear tissue, including bone, disposed in the cutting aperture. A clearance gap between the inner and outer members narrows in width in the region between the teeth and the aperture to prevent severed tissue from lodging between the inner and outer members. The height of the cutting teeth is at least 50% of their width, and 15% to 22% of the outer diameter of the inner member. The straight sides of the teeth converge to crests disposed in a first common longitudinal plane. The teeth are separated by roots disposed in a second plane parallel to the first plane but disposed closer than the first plane to the rotation axis.
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Citations
28 Claims
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1. A surgical cutting instrument for cutting anatomical tissue comprising
an elongate outer tubular member having a proximal end, a distal end and a longitudinal axis; -
cutting port means at said distal end for receiving anatomical tissue; an elongate inner tubular member having a proximal end and a distal end; tissue cutting means on said inner member distal end including a plurality of straight-sided triangular cutting teeth linearly aligned parallel with said axis; and mounting means for securing said inner member coaxially within said outer member to permit selective rotation of said inner member relative to said outer member, wherein the distal end of said inner member is in engagement with the distal end of said outer member, and wherein said cutting means is positioned to cut anatomical tissue received through said cutting port means when said inner member is rotated in said outer member. - View Dependent Claims (2)
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3. A surgical cutting instrument for cutting tissue comprising
an elongate outer tubular member having a proximal end, a distal end and an outer cutting edge at said distal end; -
an elongate inner tubular member having a central longitudinal axis, a proximal end, a distal end and an inner cutting edge at said distal end, said inner cutting edge defining a plurality of triangular cutting teeth each having straight linear sides converging to a crest, said inner member being coaxially and rotatably received in said outer member to position said inner cutting edge adjacent said outer cutting edge and to permit said inner cutting edge to move past said outer cutting edge to cut tissue; and a clearance gap disposed between said inner and outer members, said gap having a predetermined width tapering to a relatively narrow width between said outer cutting edge and said inner cutting edge. - View Dependent Claims (4, 5, 6)
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7. A surgical cutting instrument for cutting anatomical tissue comprising
an elongate outer tubular member having a proximal end, a distal end, an inner surface and a longitudinal axis; -
an opening at said distal end circumscribed by a planar edge disposed angularly with said axis and intersecting said inner surface; an elongate inner tubular member rotatably received in said outer member and having a proximal end, a distal end and a longitudinal axis; and tissue cutting means at said inner member distal end including an arcuate leading cutting edge segment angularly disposed with respect to said inner member longitudinal axis, and first and second toothed cutting edge segments joined to respective opposite ends of said leading cutting edge segment, said toothed cutting edge segments being symmetrically disposed about said longitudinal axis and including a plurality of cutting teeth each having straight sides converting to a crest, wherein said inner member at corresponding crests of said first and second toothed cutting edge segments is circumferentially continuous over an arc in excess of 180°
, said cutting means being positionable adjacent said opening to cut anatomical tissue through said opening when said inner member is rotated in said outer member. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A surgical cutting instrument for cutting anatomical tissue comprising
an elongate outer tubular member having a proximal end, a distal end and a longitudinal axis, said distal end including an end wall having an outer surface and an arcuate inner surface; -
cutting port means at said distal end for receiving anatomical tissue; an elongate inner tubular member having a proximal end and a distal end, said inner member distal end being an end wall having an arcuate outer surface; tissue cutting means on said inner member distal end including a plurality of straight-sided triangular cutting teeth linearly aligned parallel with said axis; and mounting means for securing said inner member coaxially within said outer member to permit selective rotation of said inner member relative to said outer member, wherein said inner member distal end is in engagement with said outer member distal end, said engagement comprising a bearing contact, on said longitudinal axis, between said arcuate inner surface and said arcuate outer surface, said bearing contact being the only contact between said inner and outer members distally of said proximal end of said outer member, and wherein said cutting means is positioned to cut anatomical tissue received through said cutting port means when said inner member is rotated in said outer member.
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21. A surgical cutting instrument for cutting anatomical tissue comprising
an elongate outer tubular member having a proximal end, a distal end and a longitudinal axis, said distal end including an end wall having an outer surface and an arcuate inner surface; -
cutting port means at said distal end for receiving anatomical tissue; an elongate inner tubular member having a proximal end and a distal end, said inner member distal end being an end wall having an arcuate outer surface; tissue cutting means on said inner member distal end including a plurality of straight-sided triangular cutting teeth linearly aligned parallel with said axis; mounting means for securing said inner member coaxially within said outer member to permit selective rotation of said inner member relative to said outer member, wherein said inner member distal end is in engagement with said outer member distal end, said engagement comprising a bearing contact, on said longitudinal axis, between said arcuate inner surface and said arcuate outer surface, and wherein said cutting means is positioned to cut anatomical tissue received through said cutting port means when said inner member is rotated in said outer member; and a clearance gap between said inner and outer members totally surrounding said bearing contact. - View Dependent Claims (22, 23, 24)
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25. A surgical cutting instrument for cutting tissue comprising
an elongate outer tubular member having a proximal end, a distal end and an outer cutting edge at said distal end, said outer cutting edge extending longitudinally on said outer member; -
an elongate inner tubular member having a central longitudinal axis, a proximal end, a distal end and an inner cutting edge at said distal end, said inner cutting edge extending longitudinally on said inner member, said inner cutting edge defining a plurality of triangular cutting teeth each having straight linear sides converging to a crest, said inner member being coaxially and rotatably received in said outer member to position said inner cutting edge adjacent said outer cutting edge and to permit said inner cutting edge to move past said outer cutting edge to cut tissue; and a clearance gap disposed between said inner and outer members, said gap extending longitudinally between said inner and outer members from said distal ends to said proximal ends and having a predetermined width tapering to a relatively narrow width between said outer cutting edge and said inner cutting edge, said narrow width being approximately one-half said predetermined width. - View Dependent Claims (26)
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27. A surgical cutting instrument for cutting tissue comprising
an elongate outer tubular member having a proximal end, a distal end and an outer cutting edge at said distal end, said outer cutting edge extending longitudinally on said outer member; -
an elongate inner tubular member having a central longitudinal axis, a proximal end, a distal end, a predetermined outer diameter and an inner cutting edge at said distal end, said inner cutting edge extending longitudinally on said inner member, said inner cutting edge defining a plurality of triangular cutting teeth each having straight linear sides converging to a crest, said crests being disposed in a first common plane extending longitudinally of said inner member, said teeth being separated by a series of roots disposed in a second common plane oriented parallel to said first plane and closer than said first plane to said longitudinal axis, said teeth having a height measured between said first and second planes that is at least 15% of said outer diameter, said inner member being coaxially and rotatably received in said outer member to position said inner cutting edge adjacent said outer cutting edge and to permit said inner cutting edge to move past said outer cutting edge to cut tissue; and a clearance gap disposed between said inner and outer members, said gap extending longitudinally between said inner member and said outer member from said distal ends to said proximal ends and having a predetermined width tapering to a relatively narrow width between said outer cutting edge and said inner cutting edge.
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28. A surgical cutting instrument for cutting tissue comprising
an elongate outer tubular member having a proximal end, a distal end and an outer cutting edge at said distal end, said outer cutting edge extending longitudinally on said outer member; -
an elongate inner tubular member having a central longitudinal axis, a proximal end, a distal end and an inner cutting edge at said distal end, said inner cutting edge extending longitudinally on said inner member, said inner cutting edge defining a plurality of triangular cutting teeth each having straight linear sides converting to a crest, said crests being disposed in a first common plane extending longitudinally of said inner member, said teeth being separated by a series of roots disposed in a second common plane oriented parallel to said first plane and closer than said first plane to said longitudinal axis, said teeth having a height measured between said first and second planes and a width measured between said roots, said height being in the range of 60% to 70% of said width, said inner member being coaxially and rotatably received in said outer member to position said inner cutting edge adjacent said outer cutting edge and to permit said inner cutting edge to move past said outer cutting edge to cut tissue; and a clearance gap disposed between said inner and outer members, said gap extending longitudinally between said inner member and said outer member from said distal ends to said proximal ends and having a predetermined width tapering to a relatively narrow width between said outer cutting edge and said inner cutting edge.
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Specification