A surgical implant, typically a cervical plate assembly, comprises a plate having at least two apertures and two screw threaded fastening devices for securing the plate to bone. Each aperture in the plate has an annular groove intermediate opposite ends of the aperture and each fastening device comprises...http://www.google.fr/patents/US6613053?utm_source=gb-gplus-shareBrevet US6613053 - Surgical implant
