Surgical and medical apparatus and instruments; robotic instruments for use in the human body; magnetic navigation systems for medical use; magnetic medical apparatus; medical apparatus; apparatus and systems that record and reproduce physical characteristics for diagnosis and treatment methods; catheters; endoscopes; magnets and electric magnets for medical applications; atherectomy apparatus; conducting wires; medical apparatus for imaging; apparatus for locating medical apparatus in the body; intracranial screws; devices for taking tissue samples; electrodes and catheters with electrodes; medical and diagnostic mapping systems.;