Heart pacemakers; heart monitors; artificial hearts; medical instruments for recording heart activity; medical apparatus for diagnosing suspected heart attacks; cardiac electrodes; cardiac catheters; artificial heart valves; cardiac defibrillation electrodes; insertable heart monitors; cardiac event recorders; robotic probes for cardiac surgery; catheters; catheters for medical use; central venous catheters; medical devices for placing and securing catheters; surgical catheters; apparatus for...