Alignable Tools for Preparing an Intervertebral Site for Implanting a Prosthetic Intervertebral Disc and a Method for Using Those Tools
We describe various alignable tools, in particular, trials and chisels, that may be used in preparing an intervertebral site in a spine, the site being suitable for placement of a prosthetic intervertebral disc as a replacement for a natural disc in that spine. We also describe methods of using those tools.
1 . A spinal tool, alignable in a spine under fluoroscopy, comprising:
a tool head having opposing faces for engaging vertebral surfaces in an intervertebral space, a proximal handle end, a distal end opposite the proximal handle end, opposing side surfaces joining the opposing faces, an axis extending from the proximal handle end to the distal end, and at least one alignment port extending between the opposing side surfaces, and
a handle joinable to the tool head at proximal handle end.
2 . The tool of claim 1 where the at least one alignment port extending between the opposing side surfaces is perpendicular to the axis.
3 . The tool of claim 1 where the at least one alignment port has a cross-section selected from the group consisting of a circle, cross, rectangle, and combinations thereof.
4 . The tool of claim 1 further comprising at least one front-to-back alignment port extending from the handle end to the distal end of the tool head.
5 . The tool of claim 4 comprising a trial and wherein the handle is removable.
6 . The tool of claim 1 wherein the opposing faces for engaging vertebral surfaces in an intervertebral space are substantially flat and substantially parallel.
7 . The tool of claim 1 wherein the opposing faces for engaging vertebral surfaces in an intervertebral space are substantially flat, angled with respect to each other, and taper towards each from handle end to distal end.
8 . The tool of claim 1 comprising a chisel and wherein at least one of the tool head opposing faces further comprises at least one cutting surface for cutting a groove in the vertebral surface in the intervertebral space.
9 . The tool of claim 8 comprising a chisel and wherein each of the tool head opposing faces further comprises at least one cutting surface for cutting a groove in the vertebral surface in the intervertebral space.
10 . The tool of claim 1 comprising a chisel and wherein at least one of the tool head opposing faces further comprises at least one opening for extending a cutting surface for cutting a groove in the vertebral surface in the intervertebral space through that at least one opening and the extendable cutting surface.
11 . The tool of claim 10 comprising a chisel and wherein each of the tool head opposing faces further comprises at least one opening for extending a cutting surface for cutting a groove in the vertebral surface in the intervertebral space through that at least one opening and the extendable cutting surface.
12 . The tool of claim 10 further comprising a cam movable to extend the at least one extendable cutting surface.
13 . The tool of claim 10 further comprising approachable cones movable to extend the at least one extendable cutting surface.
14 . A spinal tool comprising:
a tool head having opposing faces for engaging vertebral surfaces in an intervertebral space, wherein at least one of the opposing faces further comprises at least one opening for extending a cutting surface for cutting a groove in the vertebral surface in the intervertebral space, the at least one extendable cutting surface, a proximal handle end, a distal end opposite the proximal handle end, opposing side surfaces joining the opposing faces, and an axis extending from the proximal handle end to the distal end, and
a handle joinable to the tool head at proximal handle end.
15 . The tool of claim 14 further comprising a cam movable to extend the at least one extendable cutting surface.
16 . The tool of claim 14 further comprising a approachable cones movable to extend the at least one extendable cutting surface.
17 . The tool of claim 14 wherein the handle is fixed to the tool head.
18 . The tool of claim 17 further including a slide hammer configured to remove the tool head with extended cutting surfaces from an intervertebral opening while cutting grooves in vertebral surfaces.