Expandable intevertebral cage

An expandable intervertebral body fusion device, comprising:

• a unitary monolithic body having a plurality of body segments coupled to each other with flexure members and an opening defined between the plurality of body segments;
• a first locking bushing extending from a first end body segment into the opening;
• a second locking bushing extending from a second end body segment into the opening;
• and
• wherein the body is configured to be mediolaterally expanded from a compressed configuration to an expanded configuration causing the plurality of body segments to generally move away from each other to expand the opening between the plurality of body segments such that the body forms a greater mediolateral footprint in the expanded configuration than in the compressed configuration, and wherein the first and second locking bushings are brought together within the opening and further expansion of the body is prevented by the interaction between the first and second locking bushings,
• wherein the first locking bushing or the second locking bushing are attached to the body with an expansion tool, the device further comprising a plurality of locking bushings having different axial lengths, wherein each different axial length is configured to permit a predetermined amount of expansion of the body.