Patent ID: 8480738

Claim:
An implant movable between collapsed and expanded orientations to space apart first and second vertebral members, the implant comprising: a first contact surface to contact against the first vertebral member; a second contact surface to contact against the second vertebral member; an outer wall extending between the first and second contact surfaces and comprising a plurality of separate outer wall sections positioned in a nested arrangement; at least one strut formed within each outer wall section, each of the at least one strut is at least partially separated from the outer wall and the at least one strut has a telescoping configuration such that the struts are configured to move between extended arrangement and in a nested arrangement; and an enclosed inner chamber positioned within the outer wall and formed by each of the struts positioned in the nested arrangement; in the collapsed orientation, the implant having a first height measured between the contact surfaces and having a greater amount of overlap in the plurality of separate outer wall sections and a greater amount of overlap of the struts; in the expanded orientation, the implant having a greater second height measured between the contact surfaces and having a lesser amount of overlap in the plurality of separate outer wall sections and a lesser amount of overlap of the struts; the enclosed inner chamber being sealed to contain the fluid in both the collapsed and expanded orientations.