Bone screws, medical and surgical apparatus and instruments, namely, bone plates, spinal retrieving fixation devices, artificial intervertebral discs, intervertebral fusing devices, orthopaedic surgery external fixation devices, surgical and medical implants made of artificial materials, implants comprising natural, non-living materials, surgery screws, artificial joints, orthopaedic fixation clamps, orthopaedic fixation screws, orthopaedic fixation plates, orthopaedic fixation rods, orthopaedic fixation devices, vertebral orthopaedic devices