Intervertebral disc prosthesis
First Claim
1. Intervertebral disc prosthesis comprising an upper plate, a lower plate, and a core, a curved upper surface of the core being in contact with at least part of a curved lower surface of the upper plate and a lower surface of the core being in contact with at least part of an upper surface of the lower plate with an angle between respective planes of the upper and lower plates being obtained by the core having an acute angle in a front-rear direction, and the upper plate being moveable at least with respect to the core and the core being movable in translation and rotation with respect to the lower plate, and in which there are cooperation means not located in the middle of the core between the lower plate and the core, so as to limit translation movements of the core with respect to the lower plate around an axis substantially parallel to the lower plate when the intervertebral disc prosthesis is assembled, and to limit or eliminate rotation movements of the core with respect to the lower plate around an axis substantially perpendicular to the lower plate when the intervertebral disc prosthesis is assembled, in which the lower plate comprises male means cooperating with female means of the core and the male means of the lower plate are two pins curved towards the inside of the prosthesis and located opposite each other on two edges of the prosthesis, and in that the female means of the core are two recesses.
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0 Petitions
Accused Products
Abstract
The present invention relates to an intervertebral disk prosthesis comprising at least three parts including a first plate, referred to as the upper plate (1), a second plate, referred to as the lower plate (2), and a core (3), the upper surface of the core (3) being in contact with at least part (10) of the lower surface of the upper plate (1) and the lower surface of the core (3) being in contact with at least part of the upper surface of the lower plate (2), and the lower plate (1) being movable at least with respect to the core (3), characterised in that there are cooperation means between the lower to plate (2) and the core (3), so as to limit or eliminate translation movements of the core (3) with respect to the lower plate (2) along an axis substantially parallel to the lower plate (2), and to limit or eliminate rotation movements of the core (3) with respect to the lower plate (2), around an axis substantially perpendicular to the lower plate (2), the planes passing through the upper (1) is and lower (2) plates forming a substantially constant angle.
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Citations
31 Claims
- 1. Intervertebral disc prosthesis comprising an upper plate, a lower plate, and a core, a curved upper surface of the core being in contact with at least part of a curved lower surface of the upper plate and a lower surface of the core being in contact with at least part of an upper surface of the lower plate with an angle between respective planes of the upper and lower plates being obtained by the core having an acute angle in a front-rear direction, and the upper plate being moveable at least with respect to the core and the core being movable in translation and rotation with respect to the lower plate, and in which there are cooperation means not located in the middle of the core between the lower plate and the core, so as to limit translation movements of the core with respect to the lower plate around an axis substantially parallel to the lower plate when the intervertebral disc prosthesis is assembled, and to limit or eliminate rotation movements of the core with respect to the lower plate around an axis substantially perpendicular to the lower plate when the intervertebral disc prosthesis is assembled, in which the lower plate comprises male means cooperating with female means of the core and the male means of the lower plate are two pins curved towards the inside of the prosthesis and located opposite each other on two edges of the prosthesis, and in that the female means of the core are two recesses.
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14. An intervertebral disc prosthesis for substitution of a fibrocartilaginous disc between adjacent vertebra in a spinal column comprising:
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an upper plate having a curved lower surface; a lower plate having an upper surface; a core having an upper surface and a lower surface, the upper surface of the core being curved and configured for contact with at least part of the curved lower surface of the upper plate and the lower surface of the core being configured for contact with at least part of the upper surface of the lower plate, said contact of the lower surface of the core with at least part of the upper surface of the lower plate being configured for translation movements of the core with respect to the lower plate along an axis substantially parallel to the upper surface of the lower plate and for rotation movements of the core with respect to the lower plate around an axis substantially perpendicular to the upper surface of the lower plate when the intervertebral disc prosthesis is assembled; and a stop comprising a male portion disposed on the lower plate and a female portion disposed on the core, the male portion and the female portion each located along an edge of the prosthesis, and the male portion and the female portion each configured to limit translation movements of the core with respect to lower plate and rotation movements of the core with respect to the lower plate, in which the male portion is a tag fixed by a dowel. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. An intervertebral disc prosthesis for substitution of a fibrocartilaginous disc between adjacent vertebra in a spinal column comprising:
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an upper plate having a curved lower surface; a lower plate having an upper surface; a core having an upper surface and a lower surface, the upper surface of the core being curved and configured for contact with at least part of the curved lower surface of the upper plate and the lower surface of the core being configured for contact with at least part of the upper surface of the lower plate, said contact of the lower surface of the cote with at least part of the upper surface of the lower plate being configured for translation movements of the core with respect to the lower plate along an axis substantially parallel to the upper surface of the lower plate and for rotation movements of the core with respect to the lower plate around an axis substantially perpendicular to the upper surface of the lower plate when the intervertebral disc prosthesis is assembled; and a stop comprising a male portion disposed on the lower plate and a female portion disposed on the core, the male portion and the female portion each located along an edge of the prosthesis, and the male portion and the female portion each configured to limit translation movements of the core with respect to lower plate and rotation movements of the core with respect to the lower plate, in which the male portion is an inwardly curved pin. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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Specification