Patent ID: 8377140

Claim:
An expandable spinal implant device for supporting vertebral bodies comprising: a first body member and a second body member each having first and second ends and defining a hollow interior, the first ends of each body member positionable toward a respective one of the vertebral bodies; and a first expansion mechanism having a first pair of drive shafts and a second expansion mechanism spaced apart from the first expansion mechanism and having a second pair of drive shafts, the respective drive shafts of each pair of drive shafts having a gear member rotationally coupling the respective drive shafts directly to each other, each pair of drive shafts threadably engaged at a first side to the first body member and at a second side to the second body member; wherein the first and second expansion mechanisms are operable to effect axial displacement of the first body member relative to the second body member by rotationally driving one of the gear members of each pair of drive shafts.