Patent ID: 8277494
Filing Date: 2012-10-02
Classification: A61B

Abstract:
1. A bone anchoring device comprising: an anchoring element having a shank to be anchored in a bone or a vertebra; a rod for connecting at least two anchoring elements, the rod having a longitudinal axis and being made of an elastic material; a receiving part being connected to the shank for receiving the rod; a seat for the rod being provided in the receiving part, the seat having a rod contacting surface; a locking device cooperating with the receiving part for fixation of the rod in the seat, the locking device comprising a rod contacting surface; wherein at least one of the rod contacting surface of the seat and the rod contacting surface of the locking device comprises an engagement structure extending transverse to the longitudinal axis when the rod is locked in the seat in the receiving part by the locking device; and wherein a cross section of the engagement structure in a plane containing the longitudinal axis of the seated rod comprises a first flank and a second flank opposite the first flank, wherein the first flank has a different inclination than the second flank with respect to a normal to the longitudinal axis to form an asymmetric cross section for the engagement structure.