Patent ID: RE42626

Claim:
Spinal osteosynthesis device comprising at least two bone-anchoring elements ( 1 ; 31 ) for anchoring in respective bodies (S, L 5 ) of the bone structure of the spine, at least one member ( 2 ; 16 ) for longitudinally connecting the bone-anchoring elements, and shackles ( 3 ) for connecting the bone-anchoring elements together, each bone-anchoring element comprising a head ( 5 ; 33 ) for grasping with a screwing tool ( 6 ), a threaded shank ( 7 ) extending the head for grasping, and a tightening element ( 8 ) which can be fitted onto this shank to immobilize the assembly comprising the connector shackle, the longitudinal connecting member and the corresponding bone-anchoring element, characterized in that the threaded shank ( 7 ) has a ball end ( 11 ) for articulation in a housing ( 12 ) of a spherical cup ( 57 ) of the head ( 5 ) for grasping, allowing the shank ( 7 ) to be oriented in many directions, and allowing the connecting shackle ( 3 ) to be positioned to suit the configuration of the vertebral segment (S, L 5 , . . . L 2 ) receiving the bone-anchoring element, and in that the ball ( 11 ) and the cup ( 57 ) an exterior surface of the head have respective centres of rotation (R 1 , R 2 ) which are separated by a distance (S), giving the device, when tightened using the tightening element ( 8 ), by bearing against the spherical cup ( 57 ) exterior surface of the head ( 5 ) for grasping, a function of returning the bone-anchoring element by transverse force, the connector shackle for this purpose having a spherical bearing surface ( 55 ) articulated to a portion of the spherical surface of the cup ( 57 ) of the head ( 5 ) of the bone-anchoring element.