Medical devices of artificial materials that are implanted in humans and coupled to human bones, for distraction osteogenesis, and equipment, namely, wrench, screws, screwdrivers, drills, and adjustment tools and equipment to facilitate implantation of such devices; medical devices of artificial materials implanted in humans, namely biofeedback sensors for use as integrated components of pacemakers, implantable defibrillators, insulin and hormone pumps, nerve stimulators, joint prostheses, neurological shunts, heart valves, and spinal and bone implants, breast implants; medical devices, namely biofeedback sensors used as an integrated component of external medical diagnostic devices for home and institutional use, namely, thermometers, blood pressure cuffs, respiratory flow meters, eye movement detectors, metabolic measurement devices, strength measurement devices, reflex testers, body mass measurement devices, nutritional measurement devices, pulse and blood oxygen measurement devices, and blood sugar, hormone and insulin measurement devices; medical devices, namely infared video eye goggles, balance plates and platforms and caloric irrigators, in the field of balance disorders, equilibrium and dizziness diagnosis and correction