Patent ID: 7559943
Filing Date: 2009-07-14
Classification: A61B

Abstract:
1. A bone screw arrangement for use with a connecting rod, the arrangement comprising: a) a retainer including a first receiving region configured to receive a connecting rod, and a second receiving region having internal drive structure comprising a plurality of internal flat surfaces; and b) an anchor including a head and a shank extending from the head, the head of the anchor positioned within the second receiving region of the retainer, the head of the anchor including external drive structure comprising a plurality of external flat surfaces that interface with the internal flat surfaces of the internal drive structure of the retainer such that torque can be transferred between the internal drive structure of the retainer and the external drive structure of the anchor; wherein the retainer is selectively pivotable relative to the anchor between a plurality of angular orientations; and wherein internal flat surfaces of the internal drive structure contact external flat surfaces of the external drive structure to transfer torque applied to the retainer to the anchor.