Multi-axial bone anchor system

Details Multi-axial bone anchor system Multi-axial bone anchor system

A - Human Necessities

61

B

A61B 17/68 (2006.01) A61B 17/70 (2006.01)

Patent

CA 2370056

A spinal implant system (22, 99) is disclosed for the fixation of bone segments in the spine. The system includes an elongated member (22), one or more bone anchor assemblies (24), and stabilizer members (26) which are fitted within the elongated member. A bone anchor is attached to a bone, and the elongated member and stabilizer are fitted over the bone anchor. A rounded washer (42) and nut (44) having a corresponding rounded underside surface are fitted on to the bone anchor over the elongated member, and tightened. The configuration of the bone anchor assembly, including an intermediate portion of the bone anchor, the arcuate washer, and the nut, along with the configuration of the sliding support, allows multi-axial positioning of the bone anchor with respect to the elongated member at a plurality of locations along a slotted member.

L'invention porte sur un système d'implant rachidien utilisé dans la fixation de segments osseux de la colonne vertébrale. Ce système comprend un élément allongé, un ou plusieurs ensembles d'ancrage et des éléments stabilisants qui sont fixés à l'élément allongé. Une ancre est fixée à un os, et l'élément allongé et l'élément stabilisant sont fixés sur l'ancre de l'os. Une rondelle et un écrou, ayant une surface sous-jacente arrondie correspondante, sont fixés sur l'ancre au-dessus de l'élément allongé et serrés. La configuration de l'ensemble ancre comprenant une partie intermédiaire de l'ancre, la rondelle courbe et l'écrou, ainsi que la configuration du support coulissant, permettent un positionnement pluriaxial de l'ancre par rapport à l'élément allongé au niveau d'une pluralité d'emplacements le long d'un élément fendu.

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