Patent ID: 8308772

Claim:
Vertebral osteosynthesis equipment, including: a bone anchoring member comprising a proximal threaded stud and a base portion configured to anchor to a vertebra; at least one linking rod; a connector having a connector bore configured to engage the proximal threaded stud and the connector further configured to engage the linking rod to thereby connect the linking rod to the bone anchoring member; a nut having a threaded nut bore configured to engage the proximal threaded stud to secure the connector to the linking rod and to the proximal threaded stud of the bone anchoring member; a retaining member comprising an unthreaded rod extending proximally from the threaded stud; an extension member configured to be positioned over the retaining member, the extension member including an unthreaded bore narrowing from an opened distal end toward a proximal end and including flexible, inwardly-bent tabs extending longitudinally in a wall of the extension member, the flexible tabs being configured for elastic outward deformation when the extension member is positioned over the retaining member to generate a holding friction between the flexible tabs and the unthreaded proximal rod of the retaining member, an external dimension of the extension member being sized and configured to be smaller than the connector bore and the nut bore such that the connector and the nut are configured to slide down the extension member toward the proximal threaded stud of the bone anchoring member when the extension member is engaged with the retaining member.