POLYAXIAL BONE ANCHORING DEVICE WITH ENLARGED PIVOT ANGLE

摘要

A polyaxial bone anchoring device includes an anchoring element having a shank and a head, a receiving part having a first end and a second end, a central axis, and an accommodation space for accommodating the head, the accommodation space having an opening at the second end, a sleeve-like insert piece configured to be arranged around a portion of the head and to be arranged in and to pivot in the accommodation space, and a pressure member including a portion configured to exert pressure onto the head, wherein the anchoring element and insert piece are pivotable with respect to the receiving part such that respective angles formed by a central axis of the insert piece with the central axis of the receiving part and a central axis of the anchoring element are adjustable, and can be locked by exerting pressure with the pressure member onto the head.

主权项

1. A polyaxial bone anchoring device comprising:
an anchoring element having a shank for anchoring in a bone and a head having a spherically-shaped outer surface portion; a receiving part having a first end and a second end, a central axis extending through the first end and the second end, a transverse channel at the first end for receiving a rod, and an accommodation space for accommodating the head, the accommodation space having an opening at the second end; and a sleeve-like insert piece configured to be arranged around a portion of the head and to be arranged in and to pivot in the accommodation space of the receiving part; wherein when the insert piece is arranged around the head, the insert piece is insertable into the accommodation space through the opening of the receiving part; and wherein when the head and the insert piece are arranged in the receiving part, the anchoring element and insert piece are pivotable with respect to the receiving part, and can be locked by exerting pressure onto the head.