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Heart Valve
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Heart valves regulate the flow of 12,000 miles of arteries, veins, and capillaries. There are four valves of the heart. They can be diseased by restricting the flow or leaking backwards.
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Prosthetic Heart Valve
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There are three types of artificial heart valve. One is the ball and cage valve. The ball and cage valve has a ring with a cage projecting out, and a ball resting on the ring. When the blood flows through the valve, it pushes the ball to the back of the cage allowing the blood to flow outward. When blood begins to flow backwards, the ball shuts the passageway back into the heart. It was first built by M. Loweell Edwards and Dr. Albert Starr. The hingeless tilting disc valve is an improvement because the pivoting disc was free to rotate as it opened and closed. Lastly, there is the tissue valve which uses animal tissue.
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