Invention of stethoscope Background Hello,my name is Masaki Hosoya,and today I’d like to talk about Rene Laennec and his work to create the first stethoscope. A stethoscope,it is an indispensable medical instrument for modern doctors.For now it is thought that “it is natural to use”,but in reality from the Ancient Greek period until the beginning of the nineteenth century auscultation was done by docter’s ears.Until then,the main consultation method was to top lightly around the affected area and palpating ,but when examining an obese patient, it is not quite possible to grasp the correct situation.There was also a moral problem in the case of female patients. And he saw the neighbors’ children listening to their ears and he was inspired.He rolled the paper into a tubular shape,one end of which was hit on the patient’s chest,and the other on his ears.Then,he heard a heart sound much better than direct ears.A stethoscope was made in this way. Research Question Is it possible to create a high accuracy stethoscope? Methods and Data 1 He examined the patient with a paper cylinder. 2 It was able to hear heart sound clearly, but it looked bad and it was not durable. 3 He joined the two wooden tubes and examined the patient as a single wooden tube. 4 The accuracy of the stethoscope was higher than the direct auscultation method. Conclusion and Future Research Laennec called the auscultatory examination by the stethoscope as indirect auscultation and its accuracy was far more reliable than the traditional examination method , so it gave a big reaction.