Polyaxial adjustment of facet joint prostheses

Details Polyaxial adjustment of facet joint prostheses Polyaxial adjustment of facet joint prostheses

A - Human Necessities

61

F

A61F 2/30 (2006.01) A61B 17/70 (2006.01) A61F 2/44 (2006.01)

Patent

CA 2548545

Prostheses, systems, and methods are provided for replacement of natural facet joints between adjacent vertebrae using polyaxial attachment mechanisms for securing the prostheses to the vertebrae. A cephalad prosthesis attached to a superior adjacent vertebra replaces the inferior half of a natural facet joint. A caudal prosthesis attached to an inferior adjacent vertebra replaces the superior half of a natural facet joint. Both the cephalad and caudal prostheses are configured with artificial facet joint structures that include articulating surfaces that cooperate and form an artificial articular configuration. The polyaxial attachment mechanism permits adjustment of the position of the artificial facet joint structure along more than one axis at or after the time the cephalad or caudal prosthesis is attached to a vertebra.

L'invention concerne des prothèses, des systèmes et des méthodes permettant de remplacer des facettes articulaires naturelles au voisinage de vertèbres au moyen de mécanismes de fixation polyaxiale permettant de fixer les prothèses aux vertèbres. Une prothèse céphalique fixée à une vertèbre adjacente supérieure remplace la moitié inférieure d'une facette articulaire naturelle. Une prothèse caudale fixée à une vertèbre adjacente inférieure remplace la moitié supérieure d'une facette articulaire naturelle. Lesdites prothèses céphalique et caudale sont conçues avec des structures de facette articulaire artificielles comprenant des surfaces d'articulation solidaires formant une structure articulaire artificielle. Le mécanisme d'ajustement polyaxial permet l'ajustement de la position de la structure de facette articulaire artificielle le long d'au moins deux axes pendant ou après la fixation de la prothèse céphalique ou caudale à une vertèbre.

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