Patent ID: 9597120
Date: 2017-03-21
CPC Classifications: A61B,Y10T

Claim:
1. A bone anchoring device comprising: a bone anchoring element having a head and a shaft configured to be anchored in a bone or a vertebra; a receiving part for coupling the bone anchoring element to a stabilization element, the receiving part having a first end, a second end, a bore extending from the first end to the second end and having a bore axis, and a recess extending from the first end towards the second end for receiving the stabilization element, the recess being in communication with the bore; a seat member configured to be inserted into the bore from the first end of the receiving part and to be arranged in the bore at the second end of the receiving part, and to be rotatable around the bore axis, the seat member having a first end with an opening for inserting the head and a seat for polyaxially holding the head, the seat member being configured to allow a first pivot angle of the bone anchoring element in a first direction relative to the bore axis that is greater than other pivot angles in other directions relative to the bore axis when the bone anchoring element and the seat member are in the receiving part; and a pressure member configured to be connected to the first end of the seat member; wherein when the head is held in the seat and central axes of the bone anchoring element and the seat member are coaxial, the first end of the seat member extends farther away from the shaft than the head extends from the shaft; and wherein when the pressure member and the seat member are in the receiving part and connected to one another and the head is held in the seat member, the pressure member is configured to contact the head to exert pressure onto the head, and is axially movable but rotationally fixed relative to the seat member, such that the pressure member is rotatable together with the seat member around the bore axis in the receiving part, so as to allow for adjustment of an orientation of the first direction relative to the bore axis.