IMPLANT DE DISQUE INTERVERTÉBRAL ET PROCÉDÉ POUR RESTAURER UNE FONCTION SUR UNE UNITÉ VERTÉBRALE FONCTIONNELLE ENDOMMAGÉE AU MOYEN DE CET IMPLANT DE DISQUE INTERVERTÉBRAL
Presented are intervertebral disc implants (20) for the total replacement of an intervertebral disc (3) within the cervical spine, comprising two articulating members (21, 25), where the inferior member (21) on its upper surface is adapted for engaging an upper vertebral body (1) and its lower surface has an convex projection (23), and the inferior member (25) on its lower surface is adapted for engaging a lower vertebral body (4) and its upper surface has an saddle shaped projection (27), which is convex in its longitudinal anterior-posterior profile and which is concave in its transversal lateral profile with the general same diameter as the convex projection (23) of the superior member (21), therefore allowing flexion-extension-motion over a variable center of rotation, and in addition allowing rotation and lateral bending through a second independent center of rotation which is located above the intervertebral disc implant (20) at a distance which is defined by the diameter of the convex projection (23) of the superior member (21), therefore allowing coupled motion for rotation and lateral bending independently from flexion/extension, and therefore more closely replicating the natural kinematics of a cervical disc.L'invention concerne des implants de disques intervertébraux (20) pour le remplacement total d'un disque intervertébral (3) à l'intérieur de la colonne cervicale, comprenant deux éléments d'articulation (21, 25), la surface supérieure de l'élément inférieur (21) supérieure étant conçue pour s'appliquer sur un corps vertébral supérieur (1) et sa surface inférieure comprenant une projection convexe (23), et la surface inférieure de l'élément inférieur (25) étant conçue pour s'appliquer sur un corps vertébral inférieur (4) et sa surface supérieure comprenant une projection en forme de selle (27), qui est convexe dans son profil antéro-postérieur longitudinal et qui est concave dans son profil latéral transversal avec le même diamètre général que la projec
