Patent ID: 7892266

Claim:
A bone anchoring device comprising: a bone anchoring element provided with a head having a first end face and defining a longitudinal axis; a threaded shaft having a second end face at an end thereof facing the first end face of the bone anchoring element; a clamping means screwed to the head of the bone anchoring element for holding the threaded shaft in a longitudinal relation to the bone anchoring element; a spherical articulation provided between the bone anchoring element and the threaded shaft in order to allow multiple orientation of the threaded shaft, wherein contact between the first and second end faces delimit the extent of movement of the spherical articulation; and rotational linkage means situated on the longitudinal axis and between the bone anchoring element and the threaded shaft permitting spherical articulation between the bone anchoring element and the threaded shaft, and rotational force exerted along an axis of the bone anchoring element or of the threaded shaft leads to rotational locking between the bone anchoring element and the threaded shaft, regardless of the multiple orientation of the threaded shaft relative to the bone anchoring element, wherein the rotational linkage means comprises a female geometrical form cooperating with a complimentary male geometrical form, delimiting therebetween a clearance in order to allow multiple orientation between the threaded shaft and the bone anchoring element, the female and male geometrical forms having non-circular transverse cross-sections.