Coupling assembly for coupling a rod to a bone anchoring element, kit of such a coupling assembly different rod receiving elements and bone anchoring device

摘要

A coupling assembly for coupling a rod to a bone anchoring element includes a receiving part having a recess for receiving the rod and an accommodation space with an opening for inserting and accommodating a head of the bone anchoring element, a pressure element having a first end surface and a flexible portion to clamp the head, and a rod receiving element configured to be assembled to the pressure element, the rod receiving element having a first end and a second end defining an opening, and a channel for receiving the rod. The channel has a bottom near the second end of the rod receiving element, and the opening of the rod receiving element opens into the channel. The first end surface of the pressure element can extend through the opening of the rod receiving element and past the bottom of the channel to contact the rod.

主权项

1. A coupling assembly for coupling a rod to a bone anchoring element, the coupling assembly comprising:
a receiving part having a first end, a second end, and a central axis extending though the first end and the second end, wherein the receiving part defines a recess at the first end for receiving the rod, and an accommodation space for accommodating a head of the bone anchoring element, the accommodation space having an opening at the second end for inserting the head; a pressure element having a first end with a first end surface, a second end, and a flexible portion at the second end to clamp the head; and a rod receiving element that is a separate piece from and configured to be assembled to the pressure element, the rod receiving element having a first end, a second end, and an opening at the second end, wherein the rod receiving element comprises two legs and a base connecting the two legs to define a channel for receiving the rod, the channel being open to the first end of the rod receiving element and having a bottom that faces the first end of the rod receiving element, and wherein the opening of the rod receiving element opens into the channel; wherein when the pressure element is positioned at least partially in the accommodation space with the first end surface directed towards the first end of the receiving part and the rod receiving element is positioned in the receiving part with the legs extending from the base towards the first end of the receiving part, the first end surface of the pressure element is configured to extend through the opening of the rod receiving element and past the bottom of the channel in a direction towards the first end of the rod receiving element to contact the rod.