Patent ID: 7955359
Filing Date: 2011-06-07
Classification: A61B

Abstract:
1. A bone anchoring device comprising: an anchoring element comprising a shank to be anchored in a bone or a vertebra and a head; a receiving portion comprising a first end, 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 open towards the first end and which forms two free legs for receiving a rod; a pressure element configured to lock said head in the receiving portion; a first closure element cooperating with said legs to secure the rod in said recess, the first closure element acting upon the rod and the rod exerting pressure on the pressure element to fix the head and the rod simultaneously; and a second closure element cooperating with said legs to secure the rod in said recess, the second closure element acting on the pressure element and on the rod to fix the head and the rod independently; wherein the first closure element and the second closure element are interchangeable.