Pedicle screw with a closure device

Details Pedicle screw with a closure device Pedicle screw with a closure device

A - Human Necessities

61

B

A61B 17/70 (2006.01) A61B 17/86 (2006.01)

Patent

CA 2650321

A pedicle screw with a closure device (16) for securing a rod (10) for stabiliza-tion of the vertebral column comprises a screw-in part (2), a head part (3) pro- vided on the screw-in part (2), and a U-shaped recess (4) disposed in the head part (3), which recess is formed by the inner surfaces (5, 6) of two arms (7, 8) and a bottom surface (9) connecting the two inner surfaces. The rod (10) is insertable into this recess, and is held by the closure device (16). The rod (10) is provided with ridges (12) and grooves (13) running transversely with respect to the rod axis (11). Likewise provided with corresponding ridges (14) and grooves (15) is the bottom surface (9). The closure device (16) comprises a support element (17), which is insertable between the two arms (7, 8). Dis- posed in a displaceable way on the support element (17) are two sliding parts (20, 21), which, via a movement mechanism, are able to be brought from a po-sition of being pushed against each other into a position of being pushed apart, in which pushed-apart position the two end regions (29), remote from one another, of the two sliding parts (20, 21) each project into a recess (23, 24) of the two arms (7, 8) in the state of the support element (17) being inserted in the screw. The closure device (16) is thereby locked with the pedicle screw; the rod (10) is firmly held in the pedicle screw.

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