The invention relates to an anchoring element comprising a screw (12) having a shank (13) with a bone thread portion and a head (14; 140), and comprising a receiving part (1) for connecting the screw to a rod-shaped element (40), the screw and the receiving part being connected to one another in a polyaxial...http://www.google.fr/patents/US20050055026?utm_source=gb-gplus-shareBrevet US20050055026 - Bone anchoring element
