Patent ID: 8778025

Claim:
A bone cage apparatus comprised of: an expandable bone cage, wherein said expandable bone cage includes: a rounded upper body member; a rounded lower body member; a proximal flange surface and distal flange surface positioned to prevent said rotatable cam lift from dislocating from position in said expandable bone cage; wherein said rounded upper body member and said lower body member are pivotally attached to each other at one end; wherein said upper body member and said lower body member have tapered distal ends and proximal ends rounded with a constant slope; wherein an upper cam and a lower cam have a plurality of nesting surface pairs that are in physical contact with each other when in a closed position; wherein said rounded upper body member has a first cam shaft follower including at least one first follower surface and said lower rounded body member has a second cam shaft follower including at least one second follower surface; and a rotatable cam lift mechanism, wherein said rotatable cam lift mechanism includes: a cam lift shaft; an expanding component attached to a distal end of said cam lift shaft, said expanding component having a plurality of cam lift pairs, a plurality of cam lift edges, and a plurality of nesting pairs; and wherein each of said plurality of nesting surface pairs is bordered by one of said cam lift pair and said cam lift pair matches an angle of the surfaces of said first cam shaft follower and said second cam shaft follower of said plurality of nesting surface pairs mate with said cam lift followers; a driving component attached to a proximal end of said cam lift shaft, said driving component having a plurality of positional flats and a plurality of positional lobes which encircle said driving component; wherein said driving component further includes a rotational driving surface adapted to receive a driver; wherein said cam lift shaft controls the pivotal movement of said rounded upper body member relative to said rounded lower body member from said closed position to an open position; wherein said cam lift shaft is secured between said rounded upper body member and said rounded lower body member.