1816 stethoscope is invented by the French physician Lin Naike. At that time, Lin Naike obese patients for a chest pain doctor, he will ear to the patient's chest, but the patient's chest, obesity, sound effects too, and hear the sound coming out from the inside. Lin Naike very upset stethoscope with clock, in a small walk way are thinking about this problem. Exactly two children squatting on the game at both ends of a long wooden beam, a child knocking on which Duanmu beam, then put his ear to the other side of the wooden beams on the children, listen to voices Sprague Rappaport Stethoscope with Clock other side. Lin Naike ideas Dayton open, immediately return to the hospital, with the roll into a cone, placed with a large cone at the end the patient's chest Sprague Rappaport Stethoscope for teaching use, listening for a moment, surprised to find that you can hear the voice of the patient within the chest.

After several tests, the trial of the l, paper, wood and other materials with different length of rod or tube shape, Lin Naike finally made the improvement of about 30 cm Dual head stethoscope for teaching use, hollow, wooden flared at each end handset. Since the invention of the handset, making Lin Naike to diagnose many different diseases, chest, and he was later revered as the father of chest medicine. Lin Naike died in 1826, only 45 years of age.

In 1840, the British physician George. Philip. Carmen improved Lin Naike designed single ear earpiece. Carmen believes that both ears can be more accurately diagnosed. Single head stethoscope for teaching use He invented the stethoscope is to the two ear plugs with two flexible hose connected to the handset can be in contact with the body, the earpiece is a mirror-like hollow cones. Carmen's stethoscope to help physicians auscultation veins, arteries, heart, lung, intestine internal voices can be heard even within the fetal heart sounds mother.

Carmen Kyle in 1937 improved the stethoscope again, adds a second handset with physical contact, can produce stereo sound effect, known Visual Electronic stethoscope as the double stethoscope, it can more accurately identify where the patient's lesions. CARE unfortunately not improved products widely adopted. Electronic digital stethoscope have recently come out, it can amplify the sound, and allows a group of physicians who were diagnosed at the same time heard the voice of the body, but also records the heart murmur Integrated with regular stethoscope, compared with normal heart sounds. Although the new stethoscope constantly available, but doctors generally like to use is still the Lin Naike design, modified by Carmen old Multi-al Visual Stethoscope.