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, spinal and bone implants, and breast implants; medical devices in the nature of biofeedback sensors for use 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