Takuo Aoyagi, inventor of pulse oximetry: the great scientist passed away three years ago, in the middle of the first wave of COVID-19 pandemic

Abstract

Antoine-Laurent de Lavoisier (1743-1794), the recognized father of modern chemistry, was the discoverer of both oxygen and hydrogen, as well as the first scientist to understand the importance of oxygen in animal respiration. Following his discoveries, researchers have tried to measure oxygenation of both blood and tissues for the next two centuries. [...]