Polyaxial bone screw with torqueless fastening

Details Polyaxial bone screw with torqueless fastening Polyaxial bone screw with torqueless fastening

A - Human Necessities

61

B

A61B 17/70 (2006.01)

Patent

CA 2540143

An adjustable spinal fixation system (10) is composed of a collection of anchoring assemblies (12) attached, via a variety of connectors (14), to spine- stabilizing rods (16). The anchoring assemblies (12) include a linking member (22) attached in a ball-and-socket fashion to a bone-engaging member that is adapted to engage a spinal bone of a patient. The linking member (22) joins one of the included connectors (14) to an associated bone-engaging member. The connectors (14) are selectively attached to one of the stabilizing rods (16). The anchoring assemblies (12) each include a support collar (18) and a split retention ring (24) that cooperate to allow adjustment of the bone-engaging member and corresponding connector during surgery. When surgery is complete, a linear engaging fastener (100) cooperates with the support collar (18) and split retention ring (24) to maintain the relative position of the entire fixation system (10), preventing unwanted movement-between the system components.

L'invention concerne un système de fixation vertébrale réglable (10) comprenant une pluralité d'ensembles d'ancrage (12) fixés au moyen d'une pluralité de raccords (14) à des broches de stabilisation vertébrale (16). Les ensembles d'ancrage (12) comprennent un élément de liaison (22) fixé par joint à rotule à un élément de contact avec l'os conçu pour entrer en contact avec un os vertébral d'un patient. L'élément de liaison (22) permet de joindre l'un desdits raccords (14) à un élément associé de contact avec l'os. Les raccords (14) sont fixés sélectivement à l'une des broches de stabilisation (16). Les ensembles d'ancrage (12) comprennent chacun un collier de support (18) et une bague de retenue fendue (24) coopérant de sorte à permettre le réglage de l'élément de contact avec l'os et du raccord correspondant pendant une opération chirurgicale. Lorsque l'opération chirurgicale est terminée, un élément de serrage de contact linéaire (100) coopère avec le collier de support (18) et la bague de retenue fendue (24) de façon à maintenir la position relative du système de fixation (10) dans son ensemble, ce qui empêche tout mouvement indésirable entre les composants du système.

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