Prosthetic Heart Valves are Medical Devices implanted in the heart to replace Damaged or diseased valves, restoring Normal blood flow and function. They come in two main types: Mechanical valves, which are durable but require Lifelong anticoagulation therapy, and Bioprosthetic Valves, which are made from Animal tissue and have a more Limited lifespan but do not usually require Long-term anticoagulation.