Implantable Intervertebral Fusion Device

Abstract

The present application relates to an implantable intervertebral fusion device for use when surgical fusion of vertebral bodies is indicated. The implant is comprised of bone conforming in size and shape with the end plates of the adjacent vertebrae and has a wedge-shaped profile with a plurality of footings and grooves located on the top and bottom surfaces.

1 . An implantable intervertebral device, comprising: a bone body substantially conforming in size and shape with the endplates of adjacent vertebrae wherein, the bone body comprises a top surface and a bottom surface and wherein each of said top and bottom surface comprises a macro-structure having plurality of footings and grooves that define a space, said space being covered by a micro-structure. 
     
     
         2 . The device of  claim 1  wherein the micro-structure mimics cancellous bone architecture. 
     
     
         3 . The device of  claim 1  wherein the micro-structure has osteoconductive or osteoinductive qualities. 
     
     
         4 . The device of  claim 1 , wherein said bone body is cut and machined into annular shapes. 
     
     
         5 . The device of  claim 1 , wherein said space is equal to at least 3 mm. 
     
     
         6 . The device of  claim 1 , wherein said footings comprise right triangles. 
     
     
         7 . The device of  claim 1 , wherein said footings have sharp ends. 
     
     
         8 . The device of  claim 1 , wherein said footings penetrate the said endplates of the vertebrae. 
     
     
         9 . The device of  claim 1  wherein the footings structurally degenerate to create an increased surface area for fusion. 
     
     
         10 . The device of  claim 1 , wherein said footings have a minimum height of 0.5 mm. 
     
     
         11 . The device of  claim 1 , wherein said grooves allow bone in-growth. 
     
     
         12 . The device of  claim 1 , wherein said grooves are positioned at the front of each said footing. 
     
     
         13 . The device of  claim 1 , wherein the said micro-structure has a roughness of the order of 100-250 micrometers. 
     
     
         14 . The device of  claim 1 , wherein the top surface forms a convex curvature with its apex at the back of said bone body. 
     
     
         15 . The device of  claim 1 , wherein the bone body has a wedge-shaped profile to adapt anatomically to a curvature of a plurality of lumbar vertebras endplates. 
     
     
         16 . The device of  claim 1 , wherein the bone body has a wedge-shaped profile to help restore disc space height and spine curvature. 
     
     
         17 . The device of  claim 16 , wherein an angle of the said wedge shaped profile lies between 7° to 9°. 
     
     
         18 . The device of  claim 1 , wherein bone body has at least one side with a lateral square guide for holding the bone body by a surgical instrument for anterior or anterior-lateral insertion. 
     
     
         19 . An implantable intervertebral device, comprising: a bone body substantially conforming in size and shape with the endplates of adjacent vertebrae wherein, the bone body comprises a top surface and a bottom surface and wherein each of said top and bottom surface comprises a macro-structure having plurality of footings and grooves that define a space, said space being covered by a micro-structure wherein the micro-structure has osteoconductive or osteoinductive qualities. 
     
     
         20 . An implantable intervertebral device, comprising: a bone body substantially conforming in size and shape with the endplates of adjacent vertebrae wherein, the bone body comprises a top surface having a convex curvature with its apex at the back of said bone body and a bottom surface and wherein each of said top and bottom surface comprises a macro-structure having plurality of footings and grooves that define a space, said space being covered by a micro-structure wherein the micro-structure has osteoconductive or osteoinductive qualities.