Spinal bone chisels
First Claim
1. A chisel for preparing adjacent vertebrae for insertion of a spinal implant into the disc space defined by the vertebrae comprising:
- a shank having a longitudinal axis extending in a first direction and distal and proximal ends;
a cutting head coupled to the distal end of the shank having a first wall terminating at a first cutting edge for cutting a channel in one of the vertebrae; and
a guide member extending from the head distal to the cutting edge for insertion into the disc space and having a first leg portion extending in the first direction and a second leg portion extending from the first portion in a direction transverse to the first direction and shaped for scooping cut material from between the vertebrae.
1 Assignment
0 Petitions
Accused Products
Abstract
A chisel with distal cutting edges, used to form channels in adjacent vertebrae, includes a shank having a longitudinal axis and a cutting head coupled to the distal end of the shank. The cutting head includes distal cutting edges, which may be linear, arcuate, or V-shaped, and a guide member, which may be hollow or formed as two spaced members, to guide the chisel into the disc space to uniformly chisel both adjacent vertebrae simultaneously to partially form a channel in the vertebrae. The guide member and cutting head may have openings for distributing cut debris to the top and bottom surfaces of the head. The guide member may also include distal transverse, longitudinal side and/or vertical cutting edges, some of which may be in stepped relationship, for further cutting the endplates and removing disc material from between adjacent vertebrae, and for scraping of endplates. Other embodiments are disclosed.
118 Citations
85 Claims
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1. A chisel for preparing adjacent vertebrae for insertion of a spinal implant into the disc space defined by the vertebrae comprising:
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a shank having a longitudinal axis extending in a first direction and distal and proximal ends;
a cutting head coupled to the distal end of the shank having a first wall terminating at a first cutting edge for cutting a channel in one of the vertebrae; and
a guide member extending from the head distal to the cutting edge for insertion into the disc space and having a first leg portion extending in the first direction and a second leg portion extending from the first portion in a direction transverse to the first direction and shaped for scooping cut material from between the vertebrae. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A chisel for preparing adjacent vertebrae for insertion of a spinal implant into the disc space defined by the vertebrae comprising:
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a shank having a longitudinal axis extending in a first direction and distal and proximal ends; and
a cutting head coupled to the distal end of the shank, the cutting head including a body having at least one cantilevered first member extending in a direction substantially parallel to the first direction cantilevered a first distance from the longitudinal axis, the first cantilevered member distally terminating in a first cutting edge extending transverse to the first direction, the first cantilevered member and body defining an open region for providing visual access to a distal end of the cutting head from the head proximal end, the first cutting edge of the first cantilevered member for cutting one of the vertebra, the cutting head further including a guide member extending from the head distal the first cutting edge and positioned for bearing against adjacent vertebrae. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A chisel for preparing adjacent vertebrae for insertion of a spinal implant into the disc space defined by the vertebrae, the chisel comprising:
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a shank having a longitudinal axis extending in a first direction and distal and proximal ends; and
a cutting head coupled to the distal end of the shank, the cutting head including at least one first wall extending generally parallel to the longitudinal axis and being a first distance from the longitudinal axis, the first wall distally terminating with a first cutting edge lying in a plane for cutting a channel in one of the vertebra;
a guide member having at least one side wall and coupled distally to the head, the at least one side wall of the guide member extending substantially along a plane generally in the first direction, the guide member having a distal end wall transverse to the longitudinal axis, the guide member at least one side wall and distal end wall defining a substantially central opening therebetween. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A chisel for preparing adjacent vertebrae for insertion of a spinal implant into the disc space defined by the vertebrae comprising:
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a shank having a longitudinal axis extending in a first direction and distal and proximal ends;
a cutting head having proximal and distal ends with the proximal end coupled to the distal end of the shank, the cutting head including a first cutting portion comprising at least one first wall extending along a plane in the first direction and spaced a first distance to the longitudinal axis, the first wall terminating at a first cutting edge at the head distal end spaced from the axis and lying in a plane; and
a guide member extending from the head distal end in the first direction and having an end wall traversing the longitudinal axis, the guide member including a second cutting portion comprising a longitudinally extending second cutting edge extending distally beyond the first cutting edge, a second distance between the second cutting edge and the longitudinal axis being less than the first distance. - View Dependent Claims (27, 28, 29, 30, 31)
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32. A chisel for preparing adjacent vertebrae for insertion of a spinal implant into the disc space defined by the vertebrae, the chisel comprising:
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a shank having a longitudinal axis defining a longitudinal direction and distal and proximal ends; and
a cutting head coupled to the distal end of the shank, the cutting head having a body including a first cutting portion comprising two side walls extending in spaced relation to each other in the longitudinal direction and a top wall connecting the two side walls such that a first through opening is defined between the top wall and the side walls of the cutting head passing through the top and side walls in a longitudinal direction parallel to the longitudinal axis, the side walls and top wall terminating in first cutting edges distal to the shank for forming a channel in at least one of the vertebrae;
the cutting head further including a guide member one piece and integral with the body and positioned distal to the first cutting portion and extending substantially along the longitudinal axis, the guide member having a wall traversing the longitudinal axis, the guide member being coextensive with and an extension of a central portion of the head forming an interior surface of the first opening. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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39. A chisel for preparing adjacent vertebrae for insertion of a spinal implant into the disc space defined by the vertebrae, the chisel comprising:
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a shank having a longitudinal axis extending in a first direction and distal and proximal ends; and
a cutting head having distal and proximal ends, the proximal end being coupled to the distal end of the shank, the cutting head including a first cutting portion comprising at least one first wall extending in the first direction and spaced a first distance from the longitudinal axis, the first wall distally terminating at a first cutting edge at the head distal end transverse to the longitudinal axis and lying in a plane; and
a guide member extending in the first direction distally from the head distal end and having a second cutting portion positioned distal to the first cutting portion, the guide member second cutting portion having a distal end terminating at a second cutting edge extending transverse to the longitudinal axis. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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57. A chisel for preparing adjacent vertebrae for insertion of a spinal implant into the disc space defined by the vertebrae, the chisel comprising:
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a shank having a longitudinal axis and distal and proximal ends;
a handle portion coupled to the proximal end of the shank;
a cutting head coupled to the distal end of the shank, the cutting head including a hollow body contiguous with an opening through the shank and an opening through the handle, the body of the cutting head comprising four sides distally terminating in cutting edges;
a scalpel comprising a knob at a proximal end and a blade edge at a distal end, the scalpel being removable positioned through the contiguous openings of the handle portion, the shank, and the hollow body of the cutting head such that the blade edge extends distal to the cutting edges of the cutting head. - View Dependent Claims (58, 59, 60)
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61. A chisel for preparing adjacent vertebrae for insertion of a spinal implant into the disc space defined by the vertebrae, the chisel comprising:
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a shank having a longitudinal axis and distal and proximal ends;
a handle coupled to the proximal end of the shank;
a cutting head coupled to the distal end of the shank, the cutting head including a hollow body comprising four sides each distally terminating in a cutting edge; and
a resilient member positioned between and for resiliently coupling a first proximal portion of the shank to a second distal portion of the shank. - View Dependent Claims (62, 63, 64, 65, 66, 67)
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68. A chisel for preparing adjacent vertebrae for insertion of a spinal implant into the disc space defined by the vertebrae, the chisel comprising:
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a shank having a longitudinal axis and distal and proximal ends; and
a cutting head coupled to the distal end of the shank, the cutting head including upper and lower spaced walls each defining a first cutting portion distally terminating with a first cutting edge, the first cutting edges being located with the longitudinal axis therebetween; and
a guide member extending distal to the first cutting portion and extending coextensive with the shank between the upper and lower spaced walls, the guide member further including top and bottom surfaces in spaced relation with each other and at a second distance from the longitudinal axis which is less than a first distance between the first cutting edges and the longitudinal axis, the cutting head further including upper and lower openings communicating with each other and extending through the cutting head, the upper and lower openings being defined by the upper and lower walls of the first cutting portions and by the top and bottom surfaces of the guide member. - View Dependent Claims (69, 70)
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71. A method for preparation of a disc space for insertion of a spinal implant into the disc space between adjacent vertebrae, comprising the steps of:
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positioning an extended guide member between adjacent vertebrae, the guide member being integral with a cutting head connected to a shank of a chisel instrument, the guide member directing first cutting edges of the cutting head into position with desired vertebrae;
removing a first portion of endplate material from at least one of two adjacent vertebrae using the first cutting edges of the cutting head; and
removing a second portion of disc material between the adjacent vertebrae using at least one second cutting edge on a distal end of the guide member. - View Dependent Claims (72, 73)
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74. A vertebral bone cutting chisel comprising:
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a bone cutting head having proximal and distal ends and opposing first and second upper and lower walls, the proximal end for coupling to an instrument shank extending in a first direction, the distal end of said walls terminating in first edges extending transverse to the first direction; and
a pair of spaced guide members extending from said head at and distally said first edges and terminating at second transverse edges, the guide members defining an open region therebetween, the first and second edges forming a stepped relation with each other. - View Dependent Claims (75, 76, 77, 78, 79, 80, 81, 82)
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83. A vertebral bone cutting chisel comprising:
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a bone cutting head having proximal and distal ends and opposing first and second upper and lower walls connected to and cantilevered from a side wall, the proximal end for coupling to an instrument shank extending in a first direction, the distal end of said walls terminating in cantilevered first and second edges extending transverse to the first direction; and
a guide member extending from said head side wall distally said first edge. - View Dependent Claims (84, 85)
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Specification