Patent ID: 11484346

Abstract:
A pivotal bone anchor assembly includes a receiver comprising a base defining a central opening and upright arms defining an open channel for receiving a rod and including tool engaging structures for releasable overlapping engagement with an insert compressing tool. The assembly further includes a bone anchor comprising a capture head pivotably positionable within the central opening of the base and an anchor portion for fixation to the bone, and a compression insert positionable within the central opening above the capture head and comprising an upper surface engageable with the rod, a center through-bore, and upward-facing tool engagement surfaces located radially outward from the center through-bore. The tool engaging structures of the upright arms and the upward-facing tool engagement surfaces of the insert are configured for simultaneous non-threadable engagement with the insert compressing tool to apply a downwardly-directed force to the capture head to temporarily independently lock an articulated position of the bone anchor with respect to the receiver.