Fastener for the osteosynthesis of the spinal column
AssigneeSoprane S.A.
InventorsJacques Fournet-Fayard, Olivier Galland, Christophe Garin, Alain Lucet
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Abstract
A fastener for relieving stress on a disc adjacent at least two vertebrae which are mechanically connected during osteosynthesis of the spinal column which fastener includes a fastening rod having a first portion which is secured to the at least two vertebrae by tightening elements provided on pedicle screws and a second portion, whose diameter is smaller than that of the first portion, which slides in a guidance element which is anchored in of the vertebra located adjacent the at least two vertebrae which are mechanically locked relative one another.
Claims15
A fastener for implanting to spaced vertebrate for relieving stress on a vertebral disc of a vertebral stage of patient's spinal column which is adjacent at least two vertebral stages which are mechanically united to one another and wherein each of the vertebral stages includes a vertebra having pedicles, the fastener comprising, a fastener rod having first and second portions, said second portion having a diameter which is less than the diameter of said first portion, at least two pedicle screw means, each pedicle screw means having a portion which is adapted to be anchorable into adjacent pedicles of the vertebrae of the at least two vertebral stages, each of said pedicle screw means including tightening means for securing said first portion of said rod to said at least two pedicle screw means so as to be in fixed relationship to the at least two vertebral stages when said fastener is in use, a guidance means having a screw portion which is adapted to be anchored into a pedicle of the vertebra of the next adjacent vertebral stage and a head portion, said head portion having an open passageway, said second portion of said fastener rod being continuously slidably engaged within said open passageway when said fastener is implanted in the vertebrae and said first portion of said rod is secured to said at least two pedicle screw means which are fixed to the at least two vertebral stages and said guidance means is secured to the next adjacent vertebral stage, whereby said fastener relieves stress on the disc adjacent the at least two vertebral stages when in use.
A fastener assembly for implanting to spaced vertebrae for relieving stress on a vertebral disc of a vertebral stage of patient's spinal column which is adjacent at least two vertebral stages which are mechanically united to one another and wherein each of the vertebral stages includes a vertebra having pedicles, the fastener assembly comprising, two essentially parallel fastener units, each of the units including a fastener rod and at least two pedicle screw means, each pedicle screw means having a portion which is adapted to be anchorable into adjacent pedicles of the vertebrae of the at least two vertebral stages, and each of the pedicle screw means including tightening means for securing said fastener rod to said at least two pedicle screw means so as to be in fixed relationship to the at least two vertebral stages, a pair of guidance means each having a screw portion which is anchorable into a pedicle of the vertebra of the next adjacent vertebral stage and a head portion, each head portion having an open passageway, each of said fastener rods being continuously slidably engaged with a separate one of said open passageways of said air of guidance means when said fastener assembly is implanted in the vertebrae and said first portion of said rods is secured to said at least two pedicle screw means of each of said fastener units which are fixed to the at least two vertebral stages and said pair of guidance means are secured to the next adjacent stage, whereby said fastener assembly relieves stress on the disc adjacent the at least two vertebral stages.
Dependencies are inferred from the claim text.