Patent ID: 8394145

Claim:
An expandable intervertebral spacer for posterior approach to an intervertebral space without needing retraction of a nerve root, comprising: a body having a height and a width; and an arm having an axis of rotation, said arm having a contact surface, a distance from said axis to a furthest distance on said contact surface being greater than a distance from said axis to a nearest edge of said body, said distance from said axis to a furthest distance on said contact surface being no greater than a distance from said axis to a furthest edge of said body, said arm being deployable, an overall height and an overall width of said body and said arm when deployed being greater than said height and said with of said body a further arm having an axis of rotation disposed within said body, said further arm having a contact surface, a distance from said axis to a furthest distance on said contact surface being greater than a distance from said axis to a nearest edge of said body, said distance from said axis to a furthest distance on said contact surface being no greater than a distance from said axis to a furthest edge of said body; wherein said arm has an arm gear encircling said axis of rotation of said arm, wherein said further arm has an arm gear encircling said axis of rotation of said further arm; and wherein said arm gear of said arm engages said arm gear of said further arm wherein said further arm is at a different depth axially than said arm; wherein said arm gear extends axially at least to said different depth of said further arm; and further comprising a central axle having a central gear engaged with said arm gear of said arm, said central axle extending axially at least to said different depth of said further arm, said central axle not engaging said arm gear of said further arm.