Patent ID: 8092534

Claim:
A system for creating a fusion device in an intervertebral disc space, the system comprising: an implantable motion preservation disc disposed in the intervertebral disc space, the motion preservation disc having an upper plate with an upper surface that interfaces with the upper vertebral body and a lower plate with a lower surface that interfaces with the lower vertebral body, the motion preservation disc being structurally configured to provide relative motion to the upper and lower vertebral bodies that at least partially matches motion of a normal natural intervertebral disc; a motion restrictor structurally arranged to convert the motion preservation disc into a fusion structure by eliminating motion capability of the motion preservation disc, the motion restrictor structurally arranged to be substantially incompressible in a vertical direction, the motion restrictor including an upper surface configured to abut the upper plate of the motion preservation disc and including a lower surface configured to abut the lower plate of the motion preservation disc, the motion restrictor being configured to substantially eliminate motion of the motion preservation disc; and a rigid body at an end of the motion restrictor, the motion restrictor extending from a substantially central location on the rigid body, the body being configured to be disposed substantially exterior of the upper and lower endplates when the motion restrictor is implanted on the implantable motion preservation disc, wherein the rigid body includes a first body portion connected to a first half of the motion restrictor and a second body portion connected to a second half of the motion restrictor, the first body portion and the second body portion being separated by a slot that extends into the motion restrictor, the revision device motion restrictor further comprising engaging elements connected to the first and second body portions and being configured to engage tool engaging portions on the motion preservation disc.