Patellar implants
AssigneeSmith & Nephew, Inc.
InventorRyan Lloyd Landon
Life of this patent
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Abstract
A patellar implant is provided being of a two part construction having a strong base portion 32, 54, 72 and 92 (manufactured from a metal material or other medical grade strong material) with a molder outer material 34, 62, 80 and 100 (manufactured from a polymeric material or other softer, smoother material) at least on one side to provide a smooth friction surface to contact the femoral portion of a patient's knee.
Claims21
A patellar implant for implantation into a patient's natural patella adjacent a femoral implant component, the patellar implant comprising:
- a base portion made from a medical grade material having a sufficient rigidity to prevent bending when positioned within a patient's natural patella, the base portion comprising a porous metallic material having a porous top surface and a porous bottom surface;
- a polymeric portion made from a polymeric material positioned about a portion of the base portion and adapted to bear against a femoral component;
- and
- a membrane embedded between the base portion and the polymeric portion to provide a barrier between the porous metallic material and the polymer material;
- and
- wherein the embedded membrane is positioned in contact with both the porous top surface of the base portion and the polymer material of the polymeric portion.
A patellar implant for implantation into a patient's natural patella adjacent a femoral implant component, the patellar implant comprising:
- a base portion made from a medical grade material having a sufficient rigidity to prevent bending when positioned within a patient's natural patella, wherein said base portion comprises a base having a top surface, a side surface, and a bottom surface;
- a polymeric portion made from a polymeric material positioned about a portion of the base portion and adapted to bear against a femoral component;
- and
- a plurality of attachment pegs depending from the bottom surface of the base, the pegs being porous to allow for the boney ingrowth of a patient's natural bone, and the polymeric portion being attached to the top surface of the base;
- and
- wherein a thin impermeable membrane is applied about portions of the attachment pegs to prevent boney tissue ingrowth along sides of the attachment pegs while allowing such boney tissue ingrowth at a bottom surface of said attachment pegs to allow for easier removal of the patellar implant in a revision surgery.
A patellar implant for implantation into a patient's natural patella adjacent a femoral implant component, the patellar implant comprising:
- a base portion made entirely from a porous metallic material having a sufficient rigidity to prevent bending of the base portion when attached to a patient's natural patella, the base portion having a porous top surface and a porous bottom surface;
- a polymeric portion made from a polymeric material, the polymeric portion positioned about a portion of the base portion and adapted to bear against a femoral component;
- and
- a membrane embedded between the base portion and the polymeric portion to provide a barrier between the porous metallic material and the polymer material, and wherein the porous bottom surface of the base portion facilitates boney tissue ingrowth into the base portion;
- and
- wherein the embedded membrane is positioned in contact with both the porous top surface of the base portion and the polymer material of the polymeric portion.
Dependencies are inferred from the claim text.