MEDICAL DEVICES THAT ARE IMPLANTED IN HUMANS AND COUPLED TO HUMAN BONES FOR THE PURPOSE OF STABILIZING THE SPINE, AND METAL SURGICAL SPINAL IMPLANT TOOLS TO FACILITATE THE IMPLANTATION OF SUCH DEVICES; ARTIFICIAL HUMAN BONE IMPLANTS; ARTIFICIAL MATERIALS FOR USE IN THEIR PLACEMENT OF BONES FOR MEDICAL USE; BONE SUBSTITUTES FOR SURGICAL USE; BONE IMPLANTS, PROSTHETIC AND FILLING MATERIALS, NAMELY, ARTIFICIAL MATERIALS FOR USE IN THE REPLACEMENT OF BONES