Patent ID: 9320545
Filing Date: 2016-04-26
CPC Classification: A61B

Claim Text:
1. A bone anchor assembly comprising: a) a bone attachment structure having an integral upper capture portion and a lower threaded portion for fixation in a bone; b) a receiver having an inner cavity and a lower opening through which the bone attachment structure can pivot with respect to the receiver; the inner cavity operably receiving the upper capture portion and having an interior surface; and c) a retainer structure being positioned within the receiver cavity prior to the bone attachment structure and having at least two discrete parts, each part having an upper capture portion engaging inner surface and a receiver cavity engaging outer surface, the inner surfaces configured to become into mating contact with the upper capture portion within the receiver cavity, so as to maintain the upper capture portion in the receiver, and wherein the outer surfaces are configured to be in slidable engagement with the cavity interior surface when the retainer structure is located in the receiver between the bone attachment structure and the cavity interior surface.