Stethoscope is the most commonly used diagnostic tool for women and children physicians, and it is the sign of doctors. Modern medicine begins with the invention of stethoscope. Since the stethoscope was applied in clinical practice on March 8th, 1817, the shape and the way of transmission have been improved continuously, but its basic structure has not changed much, mainly composed of the pickup part (chest piece), conduction part (rubber tube) and listening part (ear piece).

Acoustic stethoscope is the earliest stethoscope, and it is also a familiar medical diagnostic tool for most people. This stethoscope is a symbol of a doctor who wears it on his neck every day. Acoustic stethoscope is the most commonly used.

Electronic stethoscope is to enlarge the body’s voice by electronic technology, which overcomes the bug of high noise of acoustic stethoscope. The electronic stethoscope needs to convert the acoustic wave’s electrical signal, which is then amplified and processed to obtain the best listening. Compared with acoustic stethoscope, they are all based on the same physical principle.

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