US Patent 9421111 PLIF hinged spacer

A spinal implant formed from a hinged distractor having an upper and lower support body that is hinged by use of pinions. An insert body is constructed and arranged to slide between the section to expand and maintain a space therebetween. The insert body includes a leading edge that is tapered to allow ease of insertion. A trailing edge that extends beyond a front edge of the upper support body will cause the insert body to be locked into position. A trailing edge engages the rear of the upper support body to prevent over insertion. A lower surface of the insert body may include locking surfaces.