Björk–Shiley valve
mechanical heart valve prosthesis
The Björk–Shiley valve is a mechanical artificial heart valve. The valve was co-invented by American engineer Donald Shiley and Swedish heart surgeon Viking Björk.
Beginning in 1971, it has been used to replace aortic valves and mitral valves. It was the first successful tilting-disc valve. It was manufactured first by Shiley Laboratories, then later by Pfizer after that company purchased Shiley. One model of the Björk–Shiley valve became the subject of a famous lawsuit and recall after it was shown to malfunction.
Construction
The Björk–Shiley valve consists of a single carbon-coated disc in a metal housing. The disc is held in place by two metal struts, an inflow and an outflow strut. The housing is made from the alloy Haynes 25, which is composed of 51% cobalt, 20% chromium, 15% tungsten, and 10% nickel. The Björk–Shiley valve was considered very durable and was widely used in the 1970s.
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This entry incorporates text from “Björk–Shiley valve” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.