Implantable joint prosthesis and associated instrumentation
First Claim
Patent Images
1. An implantable prosthesis, comprising:
- upper and lower rigid, opposed, biocompatible concavo-convex shells, each shell comprising;
an outer, rough convex surface, comprising a porous coating of biocompatible material;
an inner concave surface, comprising;
a smooth contact area; and
an axial post extending toward the opposing shell;
an edge between the surfaces, comprising;
a circumferential groove;
a stop circumscribing the contact area of the inner concave surface and extending toward the opposing shell;
an insertion tab extending axially away from the opposing shell; and
a closable passage between the outer surface and the inner surface of the shell;
a deformable, resilient central body disposed between the inner, smooth concave surfaces of the upper and lower shells, comprising;
smooth convex upper and lower surfaces complementary and adjacent to the smooth contact area of the inner surfaces of the respective upper and lower shells;
a shoulder circumscribing each of the smooth convex upper and lower surfaces and adapted to contact the stop of the adjacent shell and limit relative motion of the central body with respect to the shell;
a laterally extending equatorial ridge disposed between the stop of the upper shell and the stop of the lower shell; and
an opening in the upper and lower convex contact surfaces adapted to receive the axial post of the inner surface of each shell to limit relative motion of the central body with respect to the shell;
an elastic sheath disposed between the upper and lower shells and surrounding the central body, comprising;
an inner surface;
an outer surface;
an upper edge secured to the upper shell, and a lower edge secured to the lower shell, wherein the inner surface of the sheath and the inner surfaces of the shells define an enclosing cavity.
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Abstract
An implantable prosthesis is described having a pair of opposed shells and a central body disposed between the opposed shells wherein the central body and the shells cooperate to limit the motion of the central body with respect to the shells. An assembly for preparing a disc space for the implantation of a prosthesis is further described having a plurality of instruments cooperating to guide a tool associated with the assembly.
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Citations
22 Claims
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1. An implantable prosthesis, comprising:
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upper and lower rigid, opposed, biocompatible concavo-convex shells, each shell comprising; an outer, rough convex surface, comprising a porous coating of biocompatible material; an inner concave surface, comprising; a smooth contact area; and an axial post extending toward the opposing shell; an edge between the surfaces, comprising; a circumferential groove; a stop circumscribing the contact area of the inner concave surface and extending toward the opposing shell; an insertion tab extending axially away from the opposing shell; and a closable passage between the outer surface and the inner surface of the shell; a deformable, resilient central body disposed between the inner, smooth concave surfaces of the upper and lower shells, comprising; smooth convex upper and lower surfaces complementary and adjacent to the smooth contact area of the inner surfaces of the respective upper and lower shells; a shoulder circumscribing each of the smooth convex upper and lower surfaces and adapted to contact the stop of the adjacent shell and limit relative motion of the central body with respect to the shell; a laterally extending equatorial ridge disposed between the stop of the upper shell and the stop of the lower shell; and an opening in the upper and lower convex contact surfaces adapted to receive the axial post of the inner surface of each shell to limit relative motion of the central body with respect to the shell; an elastic sheath disposed between the upper and lower shells and surrounding the central body, comprising; an inner surface; an outer surface; an upper edge secured to the upper shell, and a lower edge secured to the lower shell, wherein the inner surface of the sheath and the inner surfaces of the shells define an enclosing cavity. - View Dependent Claims (2, 3)
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4. An implantable prosthesis, comprising:
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upper and lower, opposed, biocompatible shells, at least one shell comprising a curved outer surface, at least one stabilizing flat extending from the outer surface, and an axial post extending towards the opposing shell; a central body disposed between the upper and lower shells, the central body having an opening formed therein for receiving the axial posts extending from the shells; and a centering post adapted for insertion into at least one of the shells, wherein the centering post comprises a threaded rod. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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13. An implantable prosthesis, comprising:
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upper and lower, opposed, biocompatible shells, at least one shell comprising a curved outer surface, at least one stabilizing flat extending from the outer surface, and an axial post extending towards the opposing shell; and a central body disposed between the upper and lower shells, the central body having an opening formed therein for receiving the axial posts extending from the shells, wherein the shells have a posterior portion and an anterior portion wherein the anterior portion is thicker than the posterior portion. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification