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, and spacers; spinal implant devices, namely, stabilizing cords, screws, pedicle screws, plates, and expanders; spinal implant tools and positioners, namely, surgical grippers and measuring gauges; spinal implant placement and positioning devices, namely, trocars, cannulas, and inserters; measuring gauges for placement of spinal implants; extension limiting devices, namely spacers and inter-spinous implants comprising artificial material; spinal fusion devices, namely, rods, screws, expandable screws, plates, fusion cages, and cervical plates; dynamic spinal stabilization devices, namely artificial discs and inter-spinous implants comprising artificial material; inter-spinous process devices, namely spacers, inter-spinous implants comprising artificial material; and spinal deformity corrective devices, namely rods, screws, plates, fusion cages, spacers, inter-spinous implants comprising artificial material, artificial discs, artificial vertebral bodies, surgical mesh, and inter-vertebral disc prostheses