Prosthesis for spanning a space formed upon removal of an intervertebral disk

摘要

An artificial vertebra spacer is embedded in and bridges a space between two adjacent vertebrae which are positioned superiorly and inferiorly of a removed intervertebral disk, respectively. The artificial vertebra spacer includes a hollow cylindrical member, and a helical screw thread disposed integrally on and extending helically around the hollow cylindrical member. A substantially rectangular flange portion is provided at one end of the hollow cylindrical member. The flange portion is provided with at least one hole through which at least one screw passes to fix the spacer.