SURGICAL, MEDICAL AND DENTAL INSTRUMENTS AND APPARATUS FOR PLACING OR FOR PREPARING THE PLACEMENT OF IMPLANTS IN BODY TISSUE; ARTIFICIAL LIMBS; PROSTHESES, NAMELY HIP JOINT PROSTHESIS AND HIP JOINTS SHAFTS; ENDOPROTHESIS FOR THE HIP, SPINE, ELBOW AND KNEE, IN PARTICULAR SHAFTS AND SPHERICAL HEADS; IMPLANTS, IN PARTICULAR JOINT IMPLANTS AND IMPLANTS COVERED WITH COATING MATERIALS, DENTAL AND JAW IMPLANTS, ARTIFICIAL TEETH AND DENTURES AS WELL AS TOOTH PINS, ARTIFICIAL JAWS, SPINAL COLUMN IMPLANTS; ARTIFICIAL JOINTS, LIAGAMENTS, TENDONS; INSTRUMENTS AND TOOLS FOR THE IMPLANTATION OF PROSTHESIS AND PARTS OF PROSTHESIS AND ALSO FOR THE OPERATIVE TREATMENT OF FRACTURES; FIXATORS FOR BONES; PLATES; BONE SCREWS AND BONE NAILS, IMPLANTS IN THE NATURE OF PEDICLE SCREWS