Patent ID: 7422597
Filing Date: 2008-09-09
Classification: A61B

Abstract:
1. Implant for osteosynthesis device particularly of the backbone, comprising a bone anchoring device topped by a fixing head comprising two lateral branches forming an open U and configured to receive a linking rod, and a threaded nut adapted to screw on corresponding threaded parts produced on partially cylindrical outer walls of the lateral branches of the fixing head, wherein the nut comprises a plate mounted completely within a diameter of an open cylindrical inner part of the nut, the plate being in free rotation in and extending diametrically across the open cylindrical inner part, the plate having a width such that two lateral clearances are defined on either side of said plate in order to allow passage of the branches of the fixing head inside the nut whereby the plate is allowed to slide between the branches; wherein said two lateral clearances are configured and dimensioned to receive, when the lateral branches of the fixing head are engaged in said lateral clearances, two pins of an auxiliary tool for gripping the nut in order to facilitate assembly of the nut on the fixing head.