Patent ID: 8080044

Claim:
A bone anchoring device comprising: a head portion; and a shaft for anchoring in a bone and having a longitudinal axis, the shaft comprising: a first section comprising a first end, a second end, an outer wall extending from the first end to the second end, and a plurality of barb elements extending outwardly from the outer wall, the barb elements being elastically deformable relative to the outer wall, arranged on at least one helical line around the shaft forming at least one full turn of the helix, and configured to cause the first section to screw into or out of the bone when the first portion is turned in a clockwise or counterclockwise direction in the bone; a second section comprising a bone thread for engagement with the bone, the second section extending along the longitudinal axis from the first section, the bone thread and the at least one helical line generated by the barb elements having the shape of at least a single helix; wherein the largest diameter of the bone thread is larger than the diameter of the outer wall; and wherein the shaft has an end opposite to the head portion and the first section is provided between the second section and the end opposite the head portion.