Patent ID: 9339302
Filing Date: 2016-05-17
CPC Classification: A61B

Claim Text:
1. A polyaxial bone anchoring device comprising: a bone anchoring element having a shank to be anchored to a bone and a head; a receiving part configured to be coupled to the shank and to pivotably receive the head, and having a channel for receiving a rod and a central axis; a pressure member configured to be received in the receiving part and to exert pressure onto the head to lock the head in the receiving part; a locking assembly that is insertable into the channel, the locking assembly comprising a first locking member having a first end, a second end configured to face the pressure member, and a bore passing through the first locking member from the first end to the second end, the bore having a bore axis; a second locking member configured to be provided in the bore of the first locking member, the second locking member having a first end, a second end and an engagement portion for a tool, wherein the first end of the second locking member is insertable into the second end of the first locking member such that the first end of the second locking member is directed towards the first end of the first locking member when the locking members are assembled; and wherein in a first configuration in which the locking members are assembled in the channel, the first locking member and the second locking member are rotationally fixed relative to each other such that by application of a first torque to the second locking member via the engagement portion in a first direction, the first locking member is rotatable together with the second locking member in the first direction and configured to be advanced in an axial direction to contact the pressure member with at least a surface portion of its second end and in a second configuration in which the locking members are assembled in the channel, the second locking member is rotatable within the first locking member such that by rotating the second locking member via the engagement portion in the first direction, the second locking member is configured to be advanced in the axial direction to contact the rod with at least a surface portion of its second end, wherein in the first configuration, the first end of the second locking member abuts against an abutment of the first locking member.