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Leweck was close to retiring from football after being diagnosed with a serious fault with a heart valve, which cost him a chance to go on a trial with German Bundesliga club Borussia Mönchengladbach.
Some years later, Shiley improved his design in cooperation with Swedish heart surgeon Viking Björk, which led to the first tilting disc heart-valve, resulting in a much better flow of blood through the valve.
Donald Shiley, one of the co-inventors of Pfizer's Bjork-Shiley heart valve