US 5,092,895 AGranted

Knee-joint prosthesis

OwnerBjorn Albrektsson, Stig Wennberginventors

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Abstract

A knee joint prosthesis for permanent anchoring in the bone tissue of a knee joint including a femur and a tibia is disclosed including a femur portion having an articulation element with a convex surface, a fixation rail for anchoring the articulation element to the femur, and an anchoring element for anchoring the fixation rail to the femur, and the tibia portion including a movable tibia plateau having a concave surface for cooperation with the convex surface of the femur articulation element, a fixed tibia plateau for anchoring the movable tibia plateau to the tibia, and an anchoring element for anchoring the movable tibia plateau to the tibia, the anchoring element including a pair of cylindrical rods imbedded in the tibia transversely to the longitudinal direction of the tibia and including at least one recess, with the fixed tibia plateau including a locking base which can be received by the recess in the cylindrical rods to anchor the movable tibia plateau to the anchoring element.

Claims14

Dependent claims

A knee joint prosthesis for permanent anchoring in the bone tissue of a knee joint in the human body including a femur portion and a tibia portion, said femur portion including a femur articulation member having a convex surface, an elongated intermediate femur member for anchoring said femur articulation member to said femur, said elongated intermediate femur member having a first surface and a second surface, said first surface of said elongated intermediate femur member intended to bear against the surface of said femur, and said second surface of said elongated intermediate femur member intended to bear against said femur articulation member so as to lock said femur articulation member to said femur, and femur anchoring means for anchoring said elongated intermediate femur member to said femur, and said tibia portion comprising a tibia articulation member having a concave surface for cooperation with said convex surface of said femur articulation member, an intermediate tibia member for anchoring said tibia articulation member to said tibia, said intermediate tibia member having a first surface and a second surface, said first surface of said intermediate tibia member intended to bear against the surface of said tibia and said second surface of said intermediate tibia member intended to bear against said tibia articulation member so as to lock said tibia articulation member to said tibia, and tibia anchoring means for anchoring said tibia articulation member to said tibia, said tibia anchoring means comprising cylindrical rod means intended to be imbedded in said tibia in a direction substantially transverse to the longitudinal direction of said tibia, said cylindrical rod means including at least one recess and a central channel, said cylindrical rod means including locking means adjustably mounted into said central channel on opposite sides of said at least one recess, and said intermediate tibia member including locking base means extending from said first surface thereof, whereby said at least one recess in said cylindrical rod means is adapted to receive said locking base means of said intermediate tibia member and said locking base means can be locked into said at least one recess by means of said locking means to thereby anchor said intermediate tibia member to said tibia anchoring means.

A knee joint prosthesis for permanent anchoring in the bone tissue of a knee joint in the human body including a femur portion and a tibia portion, said femur portion including a femur articulation member having a convex surface, an elongated intermediate femur member for anchoring said femur articulation member to said femur, said elongated intermediate femur member having a first surface and a second surface, said first surface of said elongated intermediate femur member intended to bear against the surface of said femur, and said second surface of said elongated intermediate femur member intended to bear against said femur articulation member so as to lock said femur articulation member to said femur, and femur anchoring means for anchoring said elongated intermediate femur member to said femur, and said tibia portion comprising a tibia articulation member having a concave surface for cooperation with said convex surface of said femur articulation member, an intermediate tibia member for anchoring said tibia articulation member to said tibia, said intermediate tibia member having a first surface and a second surface, said first surface of said intermediate tibia member intended to bear against the surface of said tibia and said second surface of said intermediate tibia member intended to bear against said tibia articulation member so as to lock said tibia articulation member to said tibia, and tibia anchoring means for anchoring said tibia articulation member to said tibia, said tibia anchoring means comprising cylindrical rod means intended to be imbedded in said tibia in a direction substantially transverse to the longitudinal direction of said tibia, said cylindrical rod means including at least one recess and a central threaded channel, and said intermediate tibia member including locking base means extending from said first surface thereof, said cylindrical rod means including a pair of complimentary threaded locking screws adjustably threaded into said central threaded channel on opposite sides of said at least one recess, whereby said at least one recess in said cylindrical rod means is adapted to receive said locking base means of said intermediate tibia member and said locking base means can be locked into said at least one recess by means of said pair of threaded locking screws to thereby anchor said intermediate tibia member to said tibia anchoring means.

Dependencies are inferred from the claim text.