Medical instruments for use in spinal surgery, namely, trocars, spacers, cannulas, inserters, mechanical levers, curettes, dilators, retractors, and separators; Surgical spinal implants comprising artificial material; Spinal implant systems, namely inter-vertebral body implants consisting of artificial materials, spinal implant positioners, and expanders; inter-vertebral body implants comprised of artificial material, namely, inter-vertebral body prostheses, inter-vertebral disc prostheses, a...