Patent ID: 7896902

Claim:
An assembly for securing an elongated member for surgical stabilization of a bone, the assembly comprising: a bone anchor comprising a bone engaging portion extending from a curvate head; a bi-polar member, comprising a circular disc having a beveled exterior and an aperture extending from a top opening to a bottom opening; a saddle member comprising a sidewall defining a center channel running from an upper edge to a lower opening and at least two paired branches defining an insertion channel running generally perpendicularly to the center channel, the center channel having an enlarged lower portion adjacent the lower opening sized to receive a portion of the head of an inserted bone anchor therein; a receiver member comprising at least one sidewall defining a central channel passing from a first opening at a top end to a second opening at a bottom end, the central channel having an enlarged lower portion adjacent the bottom end sized to receive the saddle member and the bi-polar member with the head of an inserted bone anchor therein, and at least one transverse channel formed in an upper portion of the receiver member generally perpendicular to the central channel, the at least one transverse channel formed as two opposite slots extending from the top end of the receiver member; a lower retaining member comprising a generally ring-shaped member having a central aperture with an upper opening at a top surface and a smaller lower opening at a lower surface and an attachment structure for attachment at a lower portion of the receiver member, wherein the lower opening and central aperture of the lower retaining member allow angular positioning of the bi-polar member with respect thereto until compression of the bipolar member between the lower retaining member and the curvate head of the bone anchor; and an upper retaining member comprising a cap having an outer sidewall and an inner sidewall, the outer sidewall configured for attachment to the upper portion of the receiver member and the inner sidewall forming a central socket with an open bottom.