Patent ID: 8628578

Claim:
An intervertebral implant comprising: a first component comprising an outer tissue engaging surface and an inner surface; a second component connected to the first component, and being relatively moveable therefrom, the second component comprising an outer tissue engaging surface and an inner surface, the second component including an actuator, the actuator comprising a screw engaged with the second component; and a third component disposed for engagement and being movable relative to the first and second components, the third component comprising a first ramp and a second ramp axially spaced apart from the first ramp, the third component comprising a first rail including at least a portion of each of the first ramp and the second ramp and a second rail including at least a portion of each of the first ramp and the second ramp, at least one of the ramp portions disposed with the first rail has a first height and at least one of the ramp portions disposed with the second rail has a second height, the first height being greater than the second height, wherein the actuator is fixedly connected with the third component to effect axial translation of the third component such that the ramps engage the inner surface of one of the first component and the second component to move the components between a first, collapsed configuration and a second, expanded configuration.