Implant with nested members and methods of use

An implant positionable between first and second vertebral members, the implant comprising:

• a first member comprising a first contact surface to contact the first vertebral member and a first sidewall that extends from the first contact surface;
• a second member comprising a second sidewall positioned adjacent to the first member;
• and
• a third member comprising a second contact surface to contact the second vertebral member and a third sidewall that extends outward from the second contact surface and is positioned adjacent to the second member;
• the members being positionable between a collapsed orientation and an expanded orientation;
• the members including struts that are at least partially separated from the sidewalls and form an enclosed chamber;
• the collapsed orientation comprising the third member collapsed within the second member, and both the second and third members collapsed within the first member;
• the expanded orientation comprising the third member extending outward from the second member and the second member extending outward from the first member;
• a height measured between the first and second contact surfaces being greater in the expanded orientation than in the collapsed orientation.

An implant positionable within first and second vertebral members, the implant comprising:

• a first member including a first contact surface to contact the first vertebral member and a first sidewall that forms a first interior space;
• a second member including a second contact surface to contact the second vertebral member and a second sidewall that forms a second interior space;
• and
• two intermediate members positioned between the first and second members and being in a telescoping arrangement;
• the members positionable in a collapsed orientation with the first member nested within the plurality of intermediate members and the intermediate members nested within the second member, and an expanded orientation with the first and second members extending outward away from the plurality of intermediate members;
• the members each include cross-sectional shapes that prevent rotation as the members move between the collapsed and expanded orientations;
• a height formed between the first and second contact surfaces being greater in the expanded orientation than in the collapsed orientation;
• each of the members including a strut that engage together and form a chamber that is smaller than the sidewalls and formed between the first and second contact surfaces, the chamber being enclosed to contain fluid to move the device from the collapsed orientation towards the expanded orientation.

An implant positionable within first and second vertebral members, the implant comprising:

• a first member;
• a second intermediate member;
• a third member;
• the members including interior struts that are at least partially spaced away from exterior sidewalls, the interior struts nest together and form an enclosed chamber;
• a duct that extends through the exterior sidewall and the interior strut of one of the members and into the enclosed chamber for delivering a fluid into the enclosed chamber;
• the members being positionable between a collapsed orientation with a first height and an expanded orientation with a second height greater than the first height;
• the members forming a three-ply overlapping arrangement in the collapsed orientation;
• in the expanded orientation the first member overlapping the second intermediate member and the third member overlapping the second intermediate member and the first member spaced away from the third member in a non-overlap arrangement.