Patent ID: 8906100

Claim:
A distractible intervertebral body fusion device for implantation into an intervertebral disc space in a patient's body, comprising: a first end plate having an outer bearing surface configured to interface with an end plate of a first vertebra of the intervertebral disc space and an inner surface opposite the outer bearing surface; a second end plate having an outer bearing surface configured to interface with an end plate of a second vertebra of the intervertebral disc space and an inner surface opposite the outer surface; at least two struts extending between the inner surfaces of the first and second end plates, each strut comprising first and second structural members and a block, where each structural member is connected at one end to one of the end plates with a flexure member and at an opposed end to the respective block with a flexure member; wherein each end plate provides at least a pair of backstops, the pair of backstops being continuous and symmetrical with each other, each backstop providing a rolling contact for a different flexure connecting one of the structural members to the respective backstop that guides a curvature of the flexure to conform to a shape of the backstop as the first end plate and the second end plate are moved from a compressed configuration to an expanded configuration relative to each other.