Cardiovascular devices, namely, coronary stent grafts; coronary stents; artificial (e.g., mammalian or mechanical) heart valves; angioplasty rings which measure blood flow, blood pressure and / or blood volume; systems for in vivo cardiovascular blood pressure monitoring including one or more sensors and means for communicating or transmitting sensor data; systems for aneurism stent graph monitoring including one or more sensors and means for communicating or transmitting sensor data; systems for hypertension monitoring including one or more sensors and means for communicating or transmitting sensor data; sensors, power sources, and electronics for use in recording and transferring internal patient data to a device external to the body including one or more sensors and means for communicating or transmitting sensor data; systems for monitoring the integrity and function of a medical implant including one or more sensors and means for communicating or transmitting sensor data; joint prostheses; medical, surgical and orthopaedic implants made of artificial materials