Reduction sleeve

摘要

Devices and methods for facilitating insertion of a spinal rod into a rod-receiving channel formed in a bone fixation element are described herein. In some embodiments, a reduction sleeve can include a through-bore sized to receive the bone fixation element and a transverse channel sized to receive the spinal rod and substantially aligned with the rod-receiving channel formed in the bone fixation element. The reduction sleeve can also include at least one break-off point for breaking and removal of the reduction sleeve The reduction sleeve can also include a plurality of threads for engaging a reduction instrument, an alignment mechanism so that the bone fixation element can only be inserted into the reduction sleeve when the rod-receiving channels are aligned, and an inwardly projecting protrusion formed on the inner surface of the reduction sleeve so that, once inserted, the projection contacts a top surface formed on the bone fixation element.

主权项

1. A spinal rod reduction system, comprising:
a bone fixation element including:
a bone anchor having a head portion and a shank portion extending distally from the head portion; anda receiver having a base, in which the head portion of the bone anchor is seated, with first and second arms extending proximally therefrom, the first and second arms defining a rod-receiving channel therebetween for receiving a spinal rod; and a reduction sleeve comprising:
a longitudinal axis, an upper end, a lower end in which a lower opening is formed, an outer surface, a channel, and a through-bore extending from the upper end to the lower end, the through bore defining an inner surface;wherein the lower opening is sized such that the receiver of the bone fixation element cannot fit through the lower opening and such that a distal-facing end surface of the distal-most end of the receiver of the bone fixation element abuts a proximal-facing surface of the lower end of the reduction sleeve when the bone fixation element is inserted through the reduction sleeve;wherein the through-bore is substantially parallel to the longitudinal axis and the through-bore is sized and configured to receive the bone fixation element; andwherein the channel is substantially transverse to the longitudinal axis and the channel is substantially aligned with the rod-receiving channel formed in the bone fixation element so that, once the bone fixation element has been inserted into the reduction sleeve, the spinal rod can pass through the channel formed in the reduction sleeve and the rod-receiving channel formed in the bone fixation element.