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Mechanical valve prostheses are man-made valves, created from a form of carbon. Mechanical valves are generally more durable than tissues valves. Mechanical valves generally last more than 15 years. However, you must take blood-thinning medication for the rest of your life if you have a mechanical valve.
On-X Life Technologies' Patient Guide for Heart Valve Replacement: Mechanical heart valve prostheses today have two leaflets (opening and closing parts of the valve) housed inside a hollow tube called the orifice with a sewing cuff on the outside to provide a means of attachment to the patient’s heart tissue.