Bone anchoring element for anchoring in a bone or vertebra, and stabilization device with such a bone anchoring element

A bone anchoring device comprising:

• a screw with a shaft and a first head directly fixed to the shaft;
• a receiving member having a recess;
• a second head in the recess of the receiving member and pivotably arranged relative to the receiving member, the second head having a bore, the first head being positioned in the bore such that the first head abuts an inner surface of the bore, the first head configured to be pivotable in the second head;
• a second pressure element configured to fix the second head from pivoting in the recess of the receiving member;
• and
• a first pressure element being elastically deformable and configured to pivotally couple the first head and the second head between a first position and a plurality of second positions angularly offset from the first position;
• wherein the first pressure element biases the first head from the plurality of second positions to the first position;
• wherein the first pressure element is made from a material being more elastic than a material of the first head.

A method of using a bone anchoring device, the method comprising:

• inserting a first head of an anchoring element in a bore of a second head, the anchoring element comprising a shaft, the first head being directly fixed to the shaft;
• inserting the second head in a recess of a receiving member, the second head being pivotally arranged relative to the receiving member, the first head being located in the second head;
• attaching the shaft of the anchoring element to a bone;
• fixing the second head from pivoting in the recess of the receiving member with a first securing element;
• wherein an elastic pressure element is configured to pivotally couple the anchoring element, including the first head and the shaft, and the second head between a first position and a plurality of second positions angularly offset from the first position;
• and
• wherein when the second head is fixed from pivoting in the recess of the receiver member, the first head and the shaft are together pivotable relative to the second head between the first position and the plurality of second positions with the elastic pressure element biasing the first head and the shaft from the plurality of second positions wherein the elastic pressure element is compressed on one side more than an opposite side to the first position wherein the compressive forces exerted on the the elastic pressure element are balanced to provide a resting position of the first head and the shaft in the first position.

A bone anchoring device, comprising:

• an anchoring element having a shank with a first head directly fixed to the shank;
• a receiving member having a recess;
• and
• a second head in the recess of the receiving member and pivotably arranged relative to the receiving member, the first head located in the second head;
• at least one securing element, wherein the securing element is moveable from a first securing element position wherein the second head is pivotable in the recess of the receiving member to a second securing element position wherein the second head is rigidly fixed from pivoting in the recess of the receiving member;
• an elastic pressure element elastically fixing the first head in a first position to the receiving member when the second head is rigidly fixed from pivoting in the recess of the receiving member in the second securing element position;
• wherein the elastic pressure element biases the first head toward the first position from a plurality of second positions angularly offset from the first position;
• and
• wherein the pressure element is less compressed in the first position than in the second position.