Artificial joint bioprosthesis for mitigation of wear
AssigneeSaint-Gobain Industrial Ceramics, Inc.
InventorEdward Lilley
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Abstract
This invention relates to an acetabular cup having a substantially hemispherical ceramic concave surface comprising at least one debris reservoir thereon having a width of between 0.010 mm and 2 mm, and also to a ceramic hip joint prosthesis head whose outer surface comprises a similar debris reservoir.
Claims20
A ceramic hip joint prosthesis head comprising:
- a) a substantially spherical outer surface having a diameter of between 15 mm and 50 mm, and
- b) a tapered recess extendng inward from the outer surface, the recess having an outer diameter of at least 4 mm and a depth of at least 6 mm
- wherein the outer surface comprises at least on debris reservoir thereon having a width of between 0.010 mm and 2 mm.
An acetabular cup having a substantially hemispherical ceramic concave surface having a maximum diameter of between 15 mm and 50 mm, and further comprising at least one debris reservoir on the concave surface having a width of between 0.010 mm and 2 mm.
A femoral prosthesis comprising:
- a) a substantially spherical hip joint prosthesis head having an outer surface, and
- b) an acetabular cup having a concave surface, the concave surface having a shape substantially corresponding to the outer surface of the head,
- wherein the head outer surface and the concave surface of the cup are positioned to substantially contact and articulate with each other to define an articulation surface, and
- wherein at least one of the outer surface of the head and the concave surface of the cup comprises at least one debris reservoir thereon,
- wherein the at least one debris reservoir is provided on the head outer surface, wherein the head tapered recess defines a frustoconical surface, wherein the head further comprises a channel in fluid connection with the at least one debris reservoir, wherein the prosthesis further comprises:
- c) a trunnion having a tapered stem adapted for friction fitting with the tapered recess of the head, the tapered stem being substantially friction fitted into the tapered recess of the head, to form a reserve defined by the friction fit of the frustoconical surface of the head and the stem,
- and wherein the channel provides fluid connection between the at least one debris reservoir and the reserve.
Dependencies are inferred from the claim text.