Modular anchor bone fusion cage

Abstract

A modular anchor bone fusion cage is provided. The cage includes a spacer configured to fit into a space between the faces of two bones that are to be fused together. A fusion plate having at least a main body portion is coupled to the spacer by a connector. Fasteners extend through the fusion plate to engage the bone. At least some of the fasteners also extend through the spacer to engage the opposed faces of the bone. A cover plate is coupled to the fusion plate to inhibit the fasteners from backing out prior to fusion of the bones.

What is claimed is: 
     
         1 . An implant configured to be interposed between opposing faces of two bones to be fused together, the implant comprising:
 a spacer configured to fit between the opposing faces of the two bones to promote fusion of the two bones, the spacer having a forward portion, a rearward portion, a top portion, a bottom portion, and two side portions; the rearward portion comprising at least one cavity, the spacer having at least one spacer channel extending from the rearward portion to at least one of the top portion or the bottom portion;   a fusion plate coupled to the spacer, the fusion plate comprising a main body portion and a first extension side portion, the main body portion comprising a forward face, a rearward face opposed to the forward face, and a sidewall connecting the forward face and the rearward face, the forward face and at least a portion of the sidewall to be received in the at least one cavity, the first extension side portion configured to extend beyond at least one of the top portion or the bottom portion of the spacer, the fusion plate comprising at least a first bore aligned with the at least one spacer channel and extending from the rearward face to the forward face of the fusion plate and a second bore in the first extension side portion extending from the rearward face to the forward face;   a plurality of fasteners comprising at least a first fastener extending through the first bore, extending through the at least one spacer channel, and exiting the top portion or the bottom portion and configured to couple the implant to an endplate of a first bone, and at least a second fastener extending through the second bore to couple the implant to a second bone; and   a lock coupled at least to the fusion plate to inhibit movement of the plurality of fasteners out of the first and second bones.