French physician, inventor of the
stethoscope in 1816. He advanced the diagnostic technique of
auscultation (listening to the internal organs) with his book
Traité de l'auscultation médiaté in 1819, which quickly became a medical classic.
Laënnec's special interest was in chest disease. Listening to the internal organs (auscultation) had been used diagnostically since the time of Hippocrates, but Laënnec introduced a wooden tube to transmit sound. He called it a stethoscope from the Greek
stethos chest.
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