Patent ID: 7799079

Claim:
An implantable orthopedic device for implantation between opposed vertebral end plates of a pair of vertebrae, the device comprising: an inner portion including a pair of spaced-apart end caps and an inner wall member there between, wherein the end caps and the inner wall member define a compartment; an outer wall member disposed about and coupled to the inner portion, wherein separation between the outer wall member and the inner portion defines an outer space, wherein at least a portion of each end cap is spaced from the outer wall member; and a first portal in fluid communication with the compartment and isolated from the outer space, and a second portal in fluid communication with the outer space and isolated from the compartment; wherein the device has a size and shape such that the device can extend between the opposed vertebral end plates such that the end caps and the outer space are in contact with the vertebral end plates.