Patent ID: 8778027

Claim:
An implant apparatus for spinal fusion, said apparatus comprising: an expandable implant cage capable of being positioned between endplates of upper and lower vertebra of a body, said expandable implant cage comprising a male and female screw arrangement and a cage expansion mechanism, wherein said cage expansion mechanism expands a size of said cage on tightening of said male and female screw arrangement, said cage expansion mechanism having four separate and expandable cage graft containment compartments connected by a common pin and having respective cavities therein for maintaining preloaded autograph material, allograft material or scaffold material; an inserter for inserting said cage in a spinal disc space that maintains a handle, a shaft and a coupling arrangement, wherein said inserter is operated to engage said coupling arrangement with said male and female screw arrangement and to tighten said male and female screw arrangement; and wherein said cage expands in foot print rather than height to prevent said autograft material, said allograft material or said scaffold material from migrating when said cage is deployed or expanded.