A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
A61F 2/44 (2006.01)
Patent
CA 2594454
Disclosed is a cervical intervertebral prosthesis comprising two connecting plates (1, 5) that are to be attached to one of the adjacent vertebral bodies, respectively, and a joint core (20). Said joint core (20) forms a joint along with one connecting plate (1), said joint being provided with a concave joint surface (11) on the joint core (20) and a complementary convex joint surface on the connecting plate (1). The joint core (20) rests on the other connecting plate (5) via a sliding surface (17) which extends substantially parallel to the direction of the connecting plate (5), makes a relative movement in said direction possible, and is surrounded by an edge (15) that limits said relative movement. The concave joint surface (11) encompasses the convex joint surface at a solid angle (28) of at least 90~. The section of the concave joint surface (11) which lies inside said solid angle lies within the recess (16) that is enclosed by the edge (15), thus increasing the stability of the prosthesis relative to laterally applied forces.
Prothèses intervertébrales cervicales qui comportent deux plaques de raccordement (1, 5) pour le raccordement à chacun des corps vertébraux voisins et une partie centrale d'articulation (20). Cette dernière forme avec la plaque de raccordement (1) une articulation pourvue d'une surface d'articulation concave (11) sur la partie centrale d'articulation (20) et d'une surface d'articulation convexe supplémentaire sur la plaque de raccordement (1). La partie centrale d'articulation (20) repose sur l'autre plaque de raccordement (5) via une surface de glissement (17) qui s'étend essentiellement parallèlement à la direction de la plaque de raccordement (5), qui permet un mouvement relatif dans cette direction et qui est entourée par un bord (15) limitant ledit mouvement relatif. La surface d'articulation concave (11) englobe la surface d'articulation convexe à un angle solide (28) d'au moins 90°. La partie de la surface d'articulation concave se trouvant dans cet angle solide se trouve à l'intérieur de l'évidement (16) entouré par le bord (15), ce qui augmente la stabilité de la prothèse par rapport à des forces latérales.
Cervitech Inc.
Marks & Clerk
LandOfFree
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