![]() These valves tend to last approximately 15 years and so for patients with a long-life expectancy, there is a high risk of further operations to replace the valves in the future These valves do not damage red blood cells as they pass through Both types of artificial heart valves have different advantages and disadvantages: Mechanical valves are replacement valves that are man-made. ![]() These valves are prosthetic models that are used to replace damaged and irreparable human heart valves.īiological valves are replacement valves that are made from a biological source, for example from a human donor or from an animal (a pig heart is very similar to a human heart and so this is a common source of a biological valve if a human donor is not available). In other words, the semilunar valves control the blood flow coming out of the ventricles whereas the mitral valve and tricuspid valve control the blood flow from the atria to the ventricles.Īs can be seen from the diagram, there are also such things as biological valves and mechanical valves. The mitral valve functions exactly the same as the tricuspid valve but on the left side of the heart. The tricuspid valve separates the right atrium from the right ventricle and allows blood to flow into the ventricle but not backwards into the atrium. They are pocket-like structures that help prevent blood flowing backwards from the arteries to the ventricles during ventricular diastole (when the chambers in the heart are relaxing). The pulmonary valve and the aortic valve are known collectively as semilunar valves. Heart valves ensure that the blood is flowing in the right direction.
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