Method and apparatus for providing a shell component incorporating a porous ingrowth material and liner
AssigneeBiomet, Inc.
InventorDavid Wayne Schroeder
Life of this patent
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Abstract
An acetabular prosthesis including a ceramic shell having multiple layers and a polymer liner formed integrally with the shell. The acetabular prosthesis shell is formed of a ceramic wherein several layers with varying porosities and thicknesses are sintered together to form a unitary structure. A polymer inner liner forms a bearing within the shell to receive the ball of a femur or femur prosthesis. The polymer liner is formed in the ceramic shell and includes a plurality of portions which interdigitate into the pores of the inner porous layer of the ceramic shell.
Claims38
An orthopedic prosthesis for implantation into a bone of a patient, said orthopedic prosthesis comprising:
- a ceramic shell having at least an inner porous ceramic layer, an intermediate substantially non-porous ceramic layer, and an outer porous ceramic layer;
- and
- a bearing liner having a first side and a second side;
- wherein said first side is affixed to said inner porous ceramic layer;
- wherein said second side is an articulation surface;
- wherein said ceramic shell is adapted to be affixed within the bone and said outer porous ceramic layer is adapted to receive bone ingrowth after the implantation.
An acetabular prosthesis for implantation in an acetabulum and surrounding pelvis, said acetabular prosthesis comprising:
- an integrally formed shell having a first porous layer and a substantially non-porous second layer adjacent said first layer;
- a bearing liner integrally formed with said porous layer such that said liner is interdigitated into said porous layer;
- said bearing liner including a first side and a second side;
- said first side substantially affixed to said first porous layer;
- said second side forming an articulation surface;
- said shell adapted to be affixed within said acetabulum;
- and
- wherein each of said layers is formed of a ceramic.
An orthopedic prosthesis to replace a hip joint comprising:
- an acetabular prosthesis having a shell formed of a plurality of integrated ceramic layers;
- a bearing liner having a first side and a second side, said first side interdigitated into a first of said plurality of ceramic layers of said shell;
- and
- a femoral head prosthesis which articulates within said bearing liner and is affixed into the intramedullary region of a femur;
- wherein said second side of said bearing liner is a surface that articulates with said femoral head.
An orthopedic implant for implantation into a body, wherein said orthopedic implant comprises:
- a substantially ceramic shell comprising a first porous layer and a non-porous layer;
- a liner, formed substantially of a polymer affixed to said first porous layer, to provide a substantially friction-free articulation surface;
- a second porous layer extending from said non-porous layer;
- and
- said shell adapted to be received within the body.
Dependencies are inferred from the claim text.