Vertebral articular facet prostheses

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/44 (2006.01) A61B 17/70 (2006.01)

Patent

CA 2193697

A device for replacing all or part of the posterior vertebral articular processes (3, 13), engaging a support (7) and members for anchoring same to the vertebra, wherein each complete (5, 15) or partial (1, 11), upper (1, 5) and/or lower (11, 15) prosthesis mimics the anatomical shape of the posterior vertebral articular process and comprises artificial sliding surfaces (2, 12) facing one another between at least two adjacent vertebrae while adapting to the physiological orientation thereof, and the anchoring members comprise a support (7) with a convex surface matching and engaging at least one portion of the concave surface of the posterior arch of the vertebra on at least one side of the spinous process (9), and rigidly connect at least one separate portion of the support (7) to a corresponding separate portion of the vertebra.

L'invention concerne un dispositif de remplacement de tout ou partie des apophyses articulaires vertébrales postérieures (3 et 13), s'appuyant sur un support (7) et ses moyens d'ancrage par rapport à la vertèbre, caractérisé en ce que chaque prothèse totale (5 et 15) ou partielle (1 et 11), supérieure (1 et 5) et/ou inférieure (11 et 15), reprenant la forme anatomique de l'apophyse articulaire vertébrale postérieure, comporte des surfaces artificielles de glissement (2 et 12) qui s'opposent entre au moins deux vertèbres adjacentes en respectant leur orientation physiologique et en ce que les moyens d'ancrage comportent un support (7) dont une face convexe épouse et vient en appui au contact d'une portion au moins de la surface concave de l'arc postérieur de la vertèbre d'un côté au moins de l'apophyse épineuse (9) et en ce que ces mêmes moyens d'ancrage associent rigidement au moins une portion distincte du support (7) à une partie distincte correspondante de la vertèbre.

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