Bone anchoring device, tool and method for assembling the same and tool for use with the same

摘要

A bone anchoring device includes an anchoring element having a shaft for anchoring in the bone and a head, a receiving part formed in one piece, and a pressure element formed in one piece. The receiving part has a seat for receiving the head and an outer channel for receiving a rod to be connected to the anchoring element, which is pivotable with respect to the receiving part and can be fixed at an angle by exerting pressure via the pressure element onto the head. The pressure element is movable in the receiving part and includes an inner channel for receiving the rod and a spring element that engages a portion of the receiving part via a detent connection so that the pressure element can be held in a position that allows pivoting of the anchoring element. The spring element is formed by at least a first portion of one of two side walls forming the inner channel, the first portion being spaced apart from a second portion of the one side wall by a slot. At least a portion of the detent connection is located on the one side wall.

主权项

1. A bone anchoring device comprising:
an anchoring element comprising a shaft for anchoring to a bone and a head; a receiving part comprising a seat for receiving the head and a U-shaped recess forming two legs defining a channel for receiving a rod to be connected to the bone anchoring device, at least one of the two less having a recess extending therein; a pressure element having a recess defined by a bottom and two side walls to receive the rod therebetween and having a spring element that is monolithic with one of the side walls and is formed by a slot in the one side wall, the pressure element being movable in the receiving part to exert pressure onto the head when the head and the pressure element are in the receiving part; and wherein the anchoring element is pivotable with respect to the receiving part and is configured to be fixed at an angle by exerting pressure via the pressure element onto the head; wherein when the pressure element is at a first position relative to the receiving part, a surface of the spring element engages a wall of the receiving part defining the recess that extends into the at least one leg to restrict upward movement of the pressure element while allowing pivoting of the anchoring element, while the surface of the spring element at the engagement is inclined relative to a central axis of the pressure element such that the pressure element is movable upwards past the first position by application of an upward force on the pressure element.