Spinal implant
AssigneesDepuy Acromed, Inc., LifeNet
InventorsStephen B. James, Billy G. Anderson, John D. Malone, Bradley T. Moore, Ronald J. Naughton
Life of this patent
Estimating the term…
Abstract
An implantable spinal graft includes a substantially annular body with opposed superior and inferior surfaces. At least a portion of the superior and inferior surfaces includes a plurality of bone-engaging protrusions. Both of the superior and inferior surfaces also include at least one region that is free of protrusions. Preferably, the protrusion-free regions are centrally disposed and are oriented so as to be parallel to or angled with respect to an anterior-posterior axis of the implant. The implant further includes a tip on the posterior that is formed by converging portion of the superior and inferior surfaces.
Claims29
An implantable bone graft, comprising:
- a solid annular body having a superior surface, an inferior surface, an anterior end, and a posterior end;
- a substantially central opening extending between the superior and inferior surfaces;
- a plurality of discrete bone-engaging teeth protruding above at least a portion of the superior and inferior surfaces, the teeth each having a base integral with one of the superior and inferior surfaces;
- a first relief on the superior surface and oriented in a desired direction to form a first tooth-free band that is not cut into the superior surface of the body;
- a second relief on the inferior surface and oriented in the desired direction to form a second tooth-free band that is not cut into the inferior surface of the body, the second tooth-free band being aligned with and formed opposite to the first tooth-free band;
- and
- a tip formed at the posterior end of the body by converging portions of the superior and inferior surfaces.
An implantable spinal prosthesis, comprising:
- a solid annular body having a superior surface, an inferior surface, an anterior end, and a posterior end;
- a substantially central opening extending between the superior and inferior surfaces;
- a plurality of discrete surface protrusions extending from at least a portion of the superior and inferior surfaces, the surface protrusions each having a base integral with one of the superior and inferior surfaces;
- at least one superior protrusion-free zone on the superior surface that is not cut into the superior surface, the superior protrusion-free zone having a predetermined shape and being oriented in a desired direction;
- at least one inferior protrusion-free zone on the inferior surface that is not cut into the inferior surface, the inferior protrusion-free zone having a predetermined shape and being oriented in a desired direction;
- and
- a tip formed at the posterior end of the body by converging portions of the superior and inferior surfaces.
Dependencies are inferred from the claim text.