Evolution of mechanical heart valves.

@article{DeWALL2000EvolutionOM,
  title={Evolution of mechanical heart valves.},
  author={RICHARD A. DeWALL and Nadia Qasim and Leo Carr},
  journal={The Annals of thoracic surgery},
  year={2000},
  volume={69 5},
  pages={1612-21}
}
The need for prosthetic heart valves was long recognized but seemed an impossible dream before 1952 when Dr Charles Hufnagel clinically introduced a ball valve that he placed into the descending thoracic aorta for treatment of aortic valvular insufficiency. Fulfillment of that dream became a reality with the advent of extracorporeal circulation in the early 1950s. Development of prosthetic heart valves involved the search for biologically compatible materials and hemologically tolerant designs… CONTINUE READING
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