medical apparatus, appliances and instruments, namely cardiac rhythm management apparatus; implantable neurological pain, tremor, incontinence and spasticity management apparatus; prosthetic and bioprosthetic heart valves; catheters for angioplasty; medical stents; implantable drug administration systems; hydrocephalic shunts; surgical instruments and accessories, namely scalpels, blades, staplers, anastomotic couplers and cardiac stabilizers; surgical and medical navigation systems for use in initially locating then tracking the position of a patient and of instruments during image guided surgery, namely, high resolution graphic computer hardware and software, tracking arrays, camera arrays, and surgical reference arc and cables, parts and fittings therefor automatic and semiautomatic defibrillators, patient simulators for automatic defibrillators, external transchest pacemakers, ECG and voice recorders, and accessories therefor