Artificial intervertebral disc having a captured ball and...

Details Artificial intervertebral disc having a captured ball and... Artificial intervertebral disc having a captured ball and...

A - Human Necessities

61

F

A61F 2/44 (2006.01) A61F 2/30 (2006.01)

Patent

CA 2497668

An artificial disc having a pair of baseplates (10, 30), for sealing against opposing vertebral bone surfaces, separated by a ball and socket joint that includes a ball (22) attached to baseplate (10). The ball is captured within a curvate socket (37) formed in a peak of a housing (31) attached to the other baseplate (30). The socket is formed by opposing curvate surfaces, one on the convex structure and one on the baseplate. The ball rotates and angulates in the socket. The ball and socket joint therefore permits the baseplates to rotate and angulate relative to one another. Rotation of the ball can be limited. The device can be axially compressive and can include wire mesh (14, 34) on the outer surfaces of the baseplates.

L'invention concerne un disque artificiel présentant une paire de plaques (10, 30) se plaquant contre les surfaces opposées de l'os vertébral et séparées par une bille et une articulation comprenant une bille (22) fixée à la plaque (10). La bille est capturée au sein d'une emboîture courbe (37) formée sur la crête d'un boîtier (31) fixé à l'autre plaque (30). L'emboîture est formée par les surfaces courbes opposées, l'une sur la structure convexe et l'autre sur la plaque. La bille tourne dans emboîture. La bille et l'articulation permettent, de ce fait, de faire tourner les plaques l'une par rapport à l'autre. La rotation de la bille peut être limitée. Le dispositif peut être comprimé de manière axiale et présenter un maillage (14, 34) sur les surfaces externes des plaques.

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