Intervertebral disc prosthesis

Details Intervertebral disc prosthesis Intervertebral disc prosthesis

A - Human Necessities

61

F

A61F 2/44 (2006.01) A61F 2/46 (2006.01)

Patent

CA 2554923

The present invention relates to an intervertebral disc prosthesis comprising at least three pieces including an upper plate (1), a lower plate (2) and a mobile core (3) at least relative to the lower plate, the upper surface of the core being in contact with at least a part of the lower surface of the upper plate, cooperation means (22, 31) limiting or preventing the movements of the core relative to the lower plate, in translation and in rotation, respectively, along an axis substantially parallel to the lower plate and about an axis substantially perpendicular to the lower plate , characterised in that at least the lower surface of the core has at least one hole (41) facilitating sliding of the core relative to the upper surface of the lower plate with which it is in contact.

L'invention concerne une prothèse de disque intervertébral composée d'au moins trois pièces comprenant une plaque supérieure (1), une plaque inférieure (2) et un élément central mobile (3) au moins par rapport à la plaque inférieure, la surface supérieure de cet élément central étant en contact avec au moins une partie de la surface inférieure de la plaque supérieure, des moyens de coopération (22, 31) limitant ou empêchant les déplacements de l'élément central par rapport à la plaque inférieure, en translation et en rotation, respectivement, le long d'un axe pratiquement parallèle à la plaque inférieure et autour d'un axe pratiquement perpendiculaire à la plaque inférieure, la surface inférieure au moins de l'élément central possédant, de façon caractéristique, au moins un orifice aveugle (41) facilitant le glissement de l'élément central par rapport à la surface supérieure de la plaque inférieure avec laquelle il est en contact.

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