Patent ID: 6267765
Filing Date: 2001-07-31
Classification: A61B

Abstract:
Spinal osteosynthesis device comprising at least two bone-anchoring elements (1; 31) for anchoring in respective bodies (S, L5) 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, L5, . . . L2) receiving the bone-anchoring element, and in that the ball (11) and the cup (57) have respective centres of rotation (R1, R2) which are separated by a distance (S), giving the device, when tightened using the tightening element (8), by bearing against the spherical cup (57) 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.