Prosthesis for intervertebral discs and instruments for implanting it
First Claim
1. An intervertebral disc prosthesis for placement in a lateral direction between vertebrae, each vertebra having a pair of mortises cut into the vertebra in the lateral direction, said prosthesis comprising:
- a cap having a convex bearing surface and an opposite mounting surface;
a first plate having a vertebra-contacting surface and an opposite cap-retaining surface including a cavity receiving said cap mounting surface in a fixed orientation with respect to said first plate; and
a second plate having a vertebra-contacting surface and an opposite concave bearing surface, said bearing surfaces cooperating to provide a pivoting joint between said plates, said vertebra-contacting surfaces each having a pair of anchoring flaps extending from said vertebra-contacting surface toward respective vertebra, said flaps being sized to engage said mortises when said prosthesis is inserted between said vertebrae in said lateral direction.
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Accused Products
Abstract
The invention concerns a prosthesis for intervertebral discs designed to be substituted for fibrocartilaginous discs ensuring connection between the vertebrae of the spinal column and its instruments for implantation.
The prosthesis is composed mainly of two plates (110, 120) each equipped with anchoring flaps (1110, 1210) separated by a joint (20) composed of a spherical cap (21) with a cylindrical base (22), of the same diameter, made in the upper side of the lower plate (120). Each of the plates (110, 120) includes, on the back, threaded holes (115, 116, 125, 126) located parallel to the anchoring flaps (1110, 1210).
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Citations
13 Claims
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1. An intervertebral disc prosthesis for placement in a lateral direction between vertebrae, each vertebra having a pair of mortises cut into the vertebra in the lateral direction, said prosthesis comprising:
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a cap having a convex bearing surface and an opposite mounting surface; a first plate having a vertebra-contacting surface and an opposite cap-retaining surface including a cavity receiving said cap mounting surface in a fixed orientation with respect to said first plate; and a second plate having a vertebra-contacting surface and an opposite concave bearing surface, said bearing surfaces cooperating to provide a pivoting joint between said plates, said vertebra-contacting surfaces each having a pair of anchoring flaps extending from said vertebra-contacting surface toward respective vertebra, said flaps being sized to engage said mortises when said prosthesis is inserted between said vertebrae in said lateral direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification