Patent ID: 8696712
Filing Date: 2014-04-15
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 having a shank axis, and a head; a receiving portion comprising a first end and a second end opposite to the first end, a longitudinal axis passing through the two ends, and a first region adjacent to the second end for receiving a section of said head; and an element moveable between an unlocked position wherein the receiving portion and the shank are rotatable relative to each other and a locked position wherein the element exerts pressure on said head to lock said shank to the receiving portion to prevent rotation of the shank relative to the receiving portion, wherein when in the locked position, an end of the shank is positioned in the receiving portion, and at least a portion of the element is positioned along the longitudinal axis between an end face of the first end of the receiving portion that is farthest away from the second end of the receiving portion and an end face at the end of the shank in the receiving portion; wherein the receiving portion and the anchoring element are configured to form a monoaxial connection, the monoaxial connection comprising a fixed angle between the longitudinal axis of the receiving portion and the shank axis in both the unlocked and locked positions; and wherein the shank comprises an outer cylindrical or conical surface configured to contact and mate a matching inner surface of the head, and the receiving portion comprises an inner cylindrical or conical surface configured to contact and mate a matching outer surface of the head.