US Patent 10117755 Multiple spindle adjustable interbody fusion devices and methods of use

An interbody fusion device includes a base member, a top member, and an expansion mechanism for moving the top member relative to the base member. The expansion mechanism may include a connector drive rod assembly, a gear, a threaded rod, and a support means. The gear ring is coupled to the threaded rod and is rotatable. The expansion mechanism may also include at least one load head coupled to the threaded rod. An alternative interbody fusion device is also disclosed and includes a bottom member, a superior member, and an expansion mechanism for moving the superior member relative to the bottom member. The expansion mechanism includes a first expansion assembly for moving a first end of the superior member relative to the bottom member, a second expansion assembly for moving a second end of the superior member relative to the bottom member, and a connector drive rod assembly.