<unk> , as depicted in patent # US003824629. The<unk>  is a mechanical artificial heart valve. The valve was co-invented by American engineer Donald<unk>  and Swedish heart surgeon Viking<unk> . 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<unk>  Laboratories, then later by Pfizer after that company purchased<unk> . One model of the<unk>  became the subject of a famous lawsuit and recall after it was shown to malfunction.
Björk–Shiley valve
Artificial heart valve
Adjustable pressure-limiting valve
Tissue engineering of heart valves
Mitrofanoff procedure
Robot-assisted double heart valve replacement
Hybrid cardiac surgery
Bentall procedure