Patent ID: 8551176

Claim:
An interbody spinal implant, comprising: a body having a top surface, a bottom surface, opposing lateral sides, opposing anterior and posterior portions, a substantially hollow center, and a single vertical aperture extending from the top surface to the bottom surface; wherein the single vertical aperture has a size and shape for both maximizing the surface area of the top surface and the bottom surface available for contacting vertebral endplate bone and maximizing the contact of a bone graft material disposed in the substantially hollow center and in the aperture with vertebral endplate bone, defines a transverse rim on the top surface and on the bottom surface, the transverse rim comprising an anterior portion width, a posterior portion width, a first lateral side width, and a second lateral side width, and has a maximum width at its center ranging from about 40% to about 80% of the distance between the opposing lateral sides and tapering inwardly from the center to each of its ends, one end proximate the anterior portion and the other end proximate the posterior portion, wherein the anterior portion width is different from the posterior portion width or the first lateral side width is different from the second lateral side width; the body having a roughened bioactive surface topography, without teeth, on at least a portion of the top surface, the bottom surface, or both the top and bottom surfaces adapted to grip bone and inhibit migration of the implant; the body having generally rounded and blunt intersections defined along the entire lengths between the top surface and the lateral sides, the bottom surface and the lateral sides, and either the top surface and the posterior portion and the bottom surface and the posterior portion, or the top surface and the anterior portion and the bottom surface and the anterior portion; and the body having at least one sharp edge between the top and bottom surfaces and the anterior portion or the top and bottom surfaces and the posterior portion.