Ankle prosthesis
AssigneeTornier SAS
InventorStephane Fournol
Life of this patent
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Abstract
An ankle prosthesis comprising a tibial plate interacting with an intermediary element in order to constitute the articular surface of said prosthesis, while the intermediary element interacts with an astragalar plate secured to the astragalus, characterized by the fact that it comprises an articular surface (5) that is constituted on the intermediary element (3) by a cylindrical section (35) whose generant (36) is concave on the frontal plane and on the tibial plate (4), having a radius (r) whose center is located at the tibia, following a shape complementing that of the intermediary element (3) in order to achieve a precise interaction.
Claims20
An ankle prosthesis adapted to be implanted between a tibia and an astragalus, the prosthesis comprising:
- an astragalus plate having upper and lower surfaces,
- a tibial plate having upper and lower surfaces,
- an intermediate element having a lower surface adapted to cooperatively engage said upper surface of said astragalus plate and an upper surface adapted to cooperatively engage said lower surface of said tibial plate so as to permit articular movement therebetween, said upper surface of said intermediate element having a configuration which is generally concave relative to a frontal plane of the prosthesis and generally convex relative to a sagittal plane of the prosthesis taken generally perpendicularly to the frontal plane, and said lower surface of said tibial plate being complimentary in configuration to said upper surface of the intermediate element so as to permit relative movement therebetween.
Dependencies are inferred from the claim text.