A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 17/86 (2006.01) A61B 17/70 (2006.01)
Patent
CA 2674392
A polyaxial bone screw assembly includes a threaded shank body having an upper portion with a laterally extending lug and a retainer having an inner cam track for receiving the lug and thus attaching the shank upper portion to the retainer within a receiver. The retainer may be a closed or open ring. The receiver has a cavity and a U-shaped cradle defining a channel for receiving a longitudinal connecting member such as a spinal fixation rod. The retainer has an external surface that mates with an internal surface of the receiver, providing a ball joint.
Un ensemble vis osseuse polyaxiale comprend une tige filetée, présentant une partie supérieure pourvue d'une saillie s'étendant latéralement, ainsi qu'un élément de retenue pourvu d'une rampe de guidage interne destinée à recevoir la saillie, fixant ainsi la partie supérieure de la tige à l'élément de retenue dans un logement. L'élément de retenue peut être une bague ouverte ou fermée. Le logement présente une cavité et un support en U définissant un canal destiné à recevoir un élément d'assemblage longitudinal, tel qu'une tige de fixation vertébrale. L'élément de retenue présente une surface extérieure correspondant à la surface intérieure du logement, formant un joint à rotule.
Fetherstonhaugh & Co.
Jackson Roger P.
LandOfFree
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