Method and apparatus for retaining screws in a plate

Details Method and apparatus for retaining screws in a plate Method and apparatus for retaining screws in a plate

A - Human Necessities

61

B

A61B 17/80 (2006.01) A61B 17/70 (2006.01)

Patent

CA 2572800

A retention system for maintaining a screw to a vertebral plate. One or more screws extend through apertures within the vertebral plate. A cavity is positioned adjacent to and overlaps into the aperture. A ring is positioned within the cavity and held in position by a cap. The cap attaches to the plate to prevent removal of the ring. The ring is deflectable between a first shape to allow the screw to be inserted and removed from the aperture, and a second shape to prevent screw back-out from the aperture. A method of using the system is also included and comprises positioning the ring within a cavity in the plate, maintaining the position of the ring to the plate by attaching a cap, inserting a screw through the aperture and attaching the plate to a vertebral member, and positioning the ring over the screw head and preventing the screw from backing-out.

L~invention concerne un système de retenue pour maintenir une vis dans une plaque vertébrale. Une ou plusieurs vis s~étendent à travers des ouvertures dans la plaque vertébrale. Une cavité est positionnée à côté et chevauche l~ouverture. Une bague est positionnée dans la cavité et maintenue en position par un couvercle. Le couvercle fixe la plaque pour empêcher le retrait de la bague. La bague est orientable entre une première forme pour permettre à la vis d~être insérée et enlevée de l~ouverture, et une deuxième forme pour empêcher la vis de sortir de l~ouverture. Un procédé d~utilisation du système est également inclus et comprend le positionnement de la bague dans une cavité de la plaque, le maintien en position de la bague sur la plaque par fixation d~un couvercle, l~insertion d~une vis à travers l~ouverture et la fixation de la plaque à un membre vertébral, et le positionnement de la bague sur la tête de vis et la prévention de la sortie de la vis.

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