Surgical and medical apparatus and instruments, in particular invasive and noninvasive head fixation devices, skull clamps, operating table connectors, fixation implants comprised of artificial material, retractors and operating implements, namely, scalpels; accessory parts for operating tables, namely, surgical and medical apparatus and instruments for use in surgery for patient positioning, surgical tool trays; retractors for holding open surgical access, retractor arms, retractor rings, retractor curves, retractor blades, retractors; operating implements, namely, scalpel, scissors, stapler, skin hooks, forceps, speculum, trocar, spreader, clamps, pliers, blades; stereotactic instruments, namely, stereotactic frames, navigation guided holders and medical instruments used to localize an area of the brain for surgery, instrument positioning and fixation needles, probes, cameras and scalpels; medical implants, namely, screws, plates, skull pins, and clips; instruments for electrosurgery and neurosurgery, namely, medical electrodes, forceps and scalpels; all of the aforesaid goods excluding audiological apparatus and instruments or parts and components therefor