Intervertebral disc replacement

A - Human Necessities – 61 – F

Patent

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A61F 2/44 (2006.01)

Patent

CA 2641942

An intervertebral disc replacement has two members attached to vertebral body endplates of two adjacent vertebrae. The two members are formed with respective articulation surfaces which form at least part of an articulation arrangement. When loaded with compressive axial force, the articulation arrangement supports the vertebral contact surfaces against the compressive force to ensure a predefined minimum intervertebral spacing, and allows a range of turning motion in all directions. The articulation arrangement is formed to provide an increase in the intervertebral spacing as a smooth function of angular displacement from a neutral position over at least part of the range of motion in each direction for each direction of motion, thereby providing motion attenuation and restoring forces.

Le remplacement de disque intervertébral, selon l'invention, comprend deux éléments attachés à des plaques de bout de corps vertébral de deux vertèbres adjacentes. Les deux éléments sont formés avec des surfaces d'articulation respectives qui font au moins partie d'un agencement d'articulation. Lorsqu'il est chargé avec une force axiale de compression, l'agencement d'articulation supporte les surfaces de contact des vertèbres à l'encontre de la force de compression pour assurer un espacement intervertébral minimum prédéfini, et permet une plage de mouvements de rotation dans toutes les directions. L'agencement d'articulation est formé de manière à procurer une augmentation de l'espacement intervertébral sous forme de fonction régulière de l'écart angulaire depuis une position neutre sur au moins une partie de la plage de mouvement dans chaque direction pour chaque direction de mouvement, en assurant ainsi une atténuation du mouvement et des forces de rétablissement.

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