Sixty years ago today, on June 12, 1965 (May 13, 1965 in the lunar calendar), my country's first artificial heart valve operation was successful. On June 12, 1965, Changhai Hospital affiliated to a military medical university in Shanghai successfully installed a self-made artificial heart valve in the heart of Xu Shubao, a patient with severe heart disease, for the first time in China to replace her sick mitral valve.