Patent ID: 8398713

Claim:
An intervertebral implant comprising: a first endplate having a first end and a second end, the first endplate comprising an upper side, a lower side, first ramped surfaces proximate the first end, and second ramped surfaces proximate the second end; a second endplate having a first end and a second end, the second endplate comprising an upper side, a lower side, first ramped surfaces proximate the first end, and second ramped surfaces proximate the second end; a central ramp having a first end and a second end, the central ramp comprising an expansion portion at the first end and an extension extending from the expansion portion, the expansion portion comprising first ramped surfaces in engagement with the first ramped surfaces of the first endplate and second ramped surfaces in engagement with the second ramped surfaces of the second endplate; and a driving ramp comprising a bore extending through the driving ramp, the driving ramp comprising ramped surfaces in engagement with the first ramped surfaces of the second endplate; wherein the central ramp is configured to move in a first direction and cause the first endplate and the second endplate to move outwardly and away from one another wherein the driving ramp comprises an upper portion, a lower portion, a first side portion connecting the upper portion and the lower portion, and a second side portion connecting the upper portion and the lower portion, the ramped surfaces of the driving ramp comprising a ramped surface in the first side portion and a ramped surface in the second side portion, wherein the upper portion comprises an upper surface having a hole formed in the upper surface that extends to the bore in the driving ramp, a screw is disposed through the hole and into engagement with an actuator assembly having an extension disposed in the bore.