Intervertebral space implant for use in spinal fusion procedures

Abstract

An implant assembly is provided for surgical implantation into an intervertebral space S, such as for stabilization of vertebrae V adjacent the intervertebral space S during a spinal fusion procedure. The implant assembly includes a primary segment separate from a secondary segment . These segments are elongate and of sufficiently small cross-section that they can be implanted posteriorly in a minimally invasive manner. The segments preferably have a rectangular cross-section so that they can be inserted on a side into the intervertebral space S and then rotated into a maximum height orientation to widen the intervertebral space S. The segments interlock together at an intersection there between. The primary segment preferably includes a tunnel and the secondary segment preferably includes a neck with the tunnel and neck sized complementally so that the segments stabilize each other where they intersect with the neck within the tunnel . The entire implant assembly is thus provided which both widens and supports the intervertebral space S and is sufficiently rigid to provide adequate support for the intervertebral space S as the vertebrae V are fusing together. The segments are fitted with height expansion systems which can be accessed after implantation of the segments so that height of the segments can be further increased, particularly at distal ends of the segments , such that the intervertebral space S can be provided with a desirable amount of lordosis.