Patent ID: 8870927
Filing Date: 2014-10-28
Classification: A61B

Abstract:
1. A bone anchoring device comprising: an anchoring element comprising a shank to be anchored to a bone or a vertebra and a head; a rod; a receiving portion comprising a first end and a second end opposite to the first end, a longitudinal axis passing through the two ends, a bore coaxial with the longitudinal axis, a first region adjacent to the second end for receiving said head and a recess which is opened towards the first end and which forms two free legs for receiving the rod; a pressure element to exert a pressure on said head to lock said head in the receiving portion, wherein said pressure element has a first end and a second end opposite to the first end and a U-shaped recess which is open towards the first end to receive the rod, the depth of the U-shaped recess being larger than the diameter of the rod; a one-piece closure element configured to engage with said legs to simultaneously fix the rod in said recess of the pressure element and fix said receiving portion to the head; and wherein an inner thread is provided at said legs and said closure element is an inner screw and wherein, when the bone anchoring device is assembled, the closure element is screwed-in between said legs and exerts a pressure directly on said rod, but not directly on said pressure element, to simultaneously fix the rod in said recess of the pressure element and fix said receiving portion to the head.