Intervertebral disk prosthesis

Details Intervertebral disk prosthesis Intervertebral disk prosthesis

A - Human Necessities

61

F

A61F 2/44 (2006.01) A61F 2/00 (2006.01) A61F 2/30 (2006.01)

Patent

CA 2504583

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.

L'invention concerne une prothèse de disque intervertébral qui comprend au moins trois parties, notamment une première plaque appelée plaque supérieure (1); une deuxième plaque appelée plaque inférieure (2); et une partie centrale (3). La surface supérieure de la partie centrale (3) est en contact avec au moins une partie (10) de la surface inférieure de la plaque supérieure (1); la surface inférieure de la partie centrale (3) est en contact avec au moins une partie de la surface supérieure de la plaque inférieure (2); et la plaque inférieure (1) peut se déplacer au moins par rapport à la partie centrale (3). Ladite prothèse est caractérisée en ce que des moyens de coopération se situent entre la plaque inférieure (2) et la partie centrale (3), afin de limiter ou d'éliminer des mouvements de translation de la partie centrale (3) par rapport à la plaque inférieure (2) le long d'un axe sensiblement parallèle à la plaque inférieure (2), et de limiter ou d'éliminer des mouvements de rotation de la partie centrale (3) par rapport à la plaque inférieure (2) autour d'un axe sensiblement perpendiculaire à la plaque inférieure (2), les plans passant par les plaques supérieure (1) et inférieure (2) formant un angle sensiblement constant.

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