All Smithsonian museums in Washington, D.C., including the National Zoo, and in New York City continue to be closed to support the effort to contain the spread of COVID-19.
National Museum of American History
14th Street and Constitution Avenue, NW
1st Floor, Center Floor Plan
The history of medical advancement in America has been one of trial and risk. Artificial heart valves were the first successful mechanical replacement of an organ in a human. Today, heart valve operations are routine, but developing a successful mechanical heart valve involved years of experimentation by small teams of doctors, scientists, and engineers after World War II.