Ankle prosthesis
First Claim
Patent Images
1. An ankle prosthesis comprising:
- a talus implant for implanting in or on a talus and a top element having a tibia implant for implanting in or on the base of a tibia, said top element and said talus implant being mounted to move relative to each other by friction on a contact interface to allow movement, wherein said contact interface presents a friction surface having a shape which is a fraction of a substantially frustoconical surface, said friction surface being oriented so that its larger radius portion is directed substantially towards the outside of an ankle when the prosthesis is in place, wherein said top element further includes an intermediate implant, having two opposite faces, which is interposed between said tibia implant and said talus implant, said intermediate implant being in free contact by relative friction with said talus implant and said tibia implant via said two opposite faces, and wherein said intermediate implant is in sliding contact with said tibia implant via a plane top face, and in sliding contact with said fraction of a substantially frustoconical surface via a bottom face having a shape which is complementary to said fraction of a substantially frustoconical surface.
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Abstract
The invention provides an ankle prosthesis for use in the field of orthopedic prostheses comprising a talus implant for implanting in or on the talus and a top element including a tibia implant for implanting in or on the base of the tibia. The top element and the talus implant being mounted to move relative to each other by friction on a contact interface so as to allow the ankle to move. The contact interface presents a friction surface that can be considered as being a fraction of a substantially frustoconical surface. When implanted, the substantially frustoconical surface is oriented so that its larger radius portion is directed substantially towards the outside of the ankle.
169 Citations
19 Claims
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1. An ankle prosthesis comprising:
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a talus implant for implanting in or on a talus and a top element having a tibia implant for implanting in or on the base of a tibia, said top element and said talus implant being mounted to move relative to each other by friction on a contact interface to allow movement, wherein said contact interface presents a friction surface having a shape which is a fraction of a substantially frustoconical surface, said friction surface being oriented so that its larger radius portion is directed substantially towards the outside of an ankle when the prosthesis is in place, wherein said top element further includes an intermediate implant, having two opposite faces, which is interposed between said tibia implant and said talus implant, said intermediate implant being in free contact by relative friction with said talus implant and said tibia implant via said two opposite faces, and wherein said intermediate implant is in sliding contact with said tibia implant via a plane top face, and in sliding contact with said fraction of a substantially frustoconical surface via a bottom face having a shape which is complementary to said fraction of a substantially frustoconical surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An ankle prosthesis comprising:
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a talus implant having means for implanting, means for attaching the talus implant in or on the base of a talus, or having both means for implanting and means for attaching the talus implant; and
a tibia implant having a top planar surface and means for implanting the tibia implant in or on the base of a tibia means for attaching the tibia implant in or on the base of a tibia or means for both implanting and attaching the tibia implant in or on the base of a tibia;
wherein said talus implant and said tibia implant are movable relative to each other by friction at a contact interface, said contact interface having a friction surface which is in the shape of a fraction of a substantially frustoconical surface, and an intermediate implant having a top planar face in frictional contact with said tibia implant, and wherein said intermediate implant and said talus implant contact one another at said contact interface. - View Dependent Claims (17)
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18. An ankle prosthesis comprising:
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a talus implant for implanting in or on a talus and a top element having a tibia implant for implanting in or on the base of a tibia, said top element and said talus implant being mounted to move relative to each other by friction on a contact interface to allow movement, wherein said contact interface presents a friction surface having a shape which is a fraction of a substantially frustoconical surface, said friction surface being oriented so that its larger radius portion is directed substantially towards the outside of an ankle when the prosthesis is in place, wherein said top element further includes an intermediate implant, having two opposite faces, which is interposed between said tibia implant and said talus implant, said intermediate implant being in free contact by relative friction with said talus implant and said tibia implant via said two opposite faces, and wherein said fraction of a substantially frustoconical surface has an axis of symmetry and includes guide means on its surface for guiding the displacement of said intermediate implant, said guide means extending in a direction that is substantially normal to the axis of symmetry of said fraction of a substantially frustoconical surface.
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19. An ankle prosthesis comprising:
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a talus implant for implanting in or on a talus and a top element having a tibia implant for implanting in or on the base of a tibia, said top element and said talus implant being mounted to move relative to each other by friction on a contact interface to allow movement. wherein said contact interface presents a friction surface having a shape which is a fraction of a substantially frustoconical surface, said friction surface being oriented so that its large radius portion is directed substantially towards the outside of an ankle when the prosthesis is in place, and wherein said tibia implant is provided with an anterior tibia shield.
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Specification