A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
A61F 2/44 (2006.01)
Patent
CA 2564987
The present invention relates to an intervertebral disc prosthesis preferably comprising at least three pieces including an upper plate (1), a lower plate (2) and a mobile core (3) at least in relation to the lower plate (2), co- operation means (23, 33) allowing to limit or eliminate the movements of the core (3) in relation to the lower plate (2), in translation and in rotation, respectively, about an axis substantially parallel to the lower plate (2) and about an axis substantially perpendicular to the lower plate (2), at least one part of the surface of at least one plate being curved and complementary with a curved surface (30) of the core (3), with which it is in contact, wherein the top (31) of the curved surface (30) of the core (3) is off centre, in at least one direction, in relation to the centre (32) of this curved surface (30).
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 (2), de moyens de coopération (23, 33) limitant ou empêchant les déplacements de l'élément central (3) par rapport à la plaque inférieure (2), respectivement en translation et en rotation, le long d'un axe pratiquement parallèle à la plaque inférieure (2) et autour d'un axe pratiquement perpendiculaire à la plaque inférieure (2), au moins une partie de la surface d'au moins une plaque étant incurvée et complémentaire d'une surface incurvée (30) de l'élément central (3) avec lequel elle est en contact, la partie supérieure (31) de la surface incurvée (30) de l'élément contral (3) étant décalée dans au moins un sens par rapport au centre (32) de cette surface incurvée (30).
Gowling Lafleur Henderson Llp
Ldr Medical
LandOfFree
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