Vertebral osteosynthesis material

Vertebral osteosynthesis material, comprising a graft or an intervertebral piece or cage designed to be inserted between two vertebrae, and an implant in the form of a staple, having two lateral branches designed to be inserted into the plates of the respective vertebrae to be immobilized and a central branch connecting these two lateral branches to each other by forming a single piece with them;

• each lateral branch has a longitudinal central axis;
• the central branch can be shortened after implantation so as to allow said lateral branches to come closer to each other and to thus achieve tight application of the vertebrae on the graft or on the intervertebral piece or cage;
• wherein:
• at least one lateral branch comprises at least one mobile portion, movable between an introduction position, in which this mobile portion is located close to said longitudinal central axis of the lateral branch and in a remainder of the lateral branch, and an anchoring position, in which this mobile portion is moved away from said longitudinal central axis of the lateral branch and protrudes laterally in relation to the remainder of the lateral branch, the lateral branch thus having, in this anchoring position, at said mobile portion, a transverse section greater than that of a hole having allowed introduction of this branch into the vertebral body of the vertebra receiving said lateral branch;
• each of the at least one mobile portion is provided with protruding reliefs able to be inserted into the bone of a vertebra, and
• the implant comprises movement means, allowing the movement of said mobile portion between said introduction and anchoring positions.