Patent ID: 6881215

Claim:
A spinal osteosynthesis system for anterior fixation, comprising: an elongate connection element; a first vertebral screw having a threaded shank and a head having a threaded portion; a connector including a first and second branch, said first branch having a bone contacting surface with a first opening surrounded by a concave recess which can be fitted on the screw and an opening between said first and second branches for securing the connection element between them, said first branch having a second opening for receiving a second vertebral screw; and a threaded clamping member which can cooperate with the threaded head in order to clamp the branches onto the connection element, the clamping member comprising a threaded element which can engage the threads of the first vertebral screw head, wherein the clamping member comprises a head having a spherical and convex lower face, a second of said branches of the connector having a concave recess around an opening in the upper face which can be in contact with the convex lower face of the clamping member at one of a plurality of different angular orientations upon clamping of the branches.