System and method for dynamic vertebral stabilization

Details System and method for dynamic vertebral stabilization System and method for dynamic vertebral stabilization

A - Human Necessities

61

F

A61F 2/30 (2006.01)

Patent

CA 2625305

An intervertebral stabilization device (12, 170) and method is disclosed. The device (12, 170) preferably includes a planar spring (20, 180) enclosed within a housing (22, 172) . The housing (122, 172) is joined to an articulation component (24, 25, 174, 175) at either end, and the articulation components (24, 25, 174, 175) have couplings (28, 178) connectable to anchoring components (19) which are securable to adjacent vertebrae. The planar spring (20, 180) can flex and retract providing relative motion between the adjacent vertebrae. The articulation components (24, 25, 174, 175) are ball and socket joints which allow the entire assembly to flexibly follow the curvature of the spine. A fusion rod (162) with articulation components and couplings (164) at either end may be substituted for the spring device. The couplings enable interchangeability between a fusion rod (162) assembly and spring assembly (12, 170) , so that dynamic stabilization can occur at one vertebral level and fusion at the adjacent vertebral level. An overhung spring assembly (250) with a sideways displaced housing (254) which allows for a shorter pedicle to pedicle displacement is also disclosed.

Dispositif (12, 170) et procédé de stabilisation intervertébrale, le dispositif (12, 170) comprenant de préférence un ressort (20, 180) planaire enfermé dans un boîtier (22, 172). Le boîtier (122, 172) est joint à un composant (24, 25, 174, 175) d'articulation à chaque extrémité et les composants (24, 25, 174, 175) d'articulation sont munis d'accouplements (28, 178) susceptibles d'être reliés à des composants (19) d'ancrage pouvant être fixés à des vertèbres adjacentes. Le ressort (20, 180) planaire peut fléchir et se rétracter, donnant un mouvement relatif entre les vertèbres adjacentes. Les composants (24, 25, 174, 175) d'articulation sont des liaisons à rotule qui permettent à tout l'ensemble de suivre de façon souple la courbure de la colonne vertébrale. Une tige (162) de fusion munie de composants d'articulation et d'accouplements (164) à chaque extrémité peut être substituée au dispositif à ressort. Les accouplements permettent une interchangeabilité entre un ensemble tige (162) de fusion et un ensemble ressort (12, 170), de sorte que la stabilisation dynamique peut avoir lieu à un niveau vertébral et la fusion au niveau vertébral voisin. L'invention concerne également un ensemble ressort (250) en porte-à-faux muni d'un boîtier (254) décalé sur le côté permettant un déplacement raccourci d'un pédicule à l'autre.

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