Pulse Oximeter Understanding Pulse Oximetry and How it Works History and DevelopmentThe pulse oximeter was invented in Japan in the 1970s by Takuo Aoyagi, a Japanese bioengineer. Early oximeters were large, bulky devices that were mostly confined to hospitals. They worked by shining two different colored lights through a part of the body like a finger or earlobe. This allowed the device to calculate the oxygen saturation level in the blood through color...
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