HOW TO USE A STETHOSCOPE & HISTORY OF STETHOSCOPE | TAMIL
0:40 - intro
1:55 - highlights
4:22 - parts
5:36 - history
6:35 - evolution of stethoscope
7:37 - end
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How to use a Stethoscope
The word stethoscope comes from the Greek words stethos, meaning chest, and skopein, meaning to explore.
It typically has a small disc-shaped resonator that is placed against the skin, and one or two tubes connected to two earpieces.
René Laennec was not comfortable placing his ear directly onto a woman's chest to listen to her heart.
He observed that a rolled piece of paper, placed between the patient's chest and his ear, could amplify heart sounds without requiring physical contact.
The first flexible stethoscope of any sort may have been a binaural.
Bird's stethoscope had a single earpiece.
In 1851, Arthur Leared invented a binaural stethoscope, and
In 1852, George Philip Cammann perfected the design of the stethoscope instrument (that used both ears) for commercial production, which has become the standard ever since.
Cammann also wrote a major treatise on diagnosis by auscultation, which the refined binaural stethoscope made possible.
The medical historian Jacalyn Duffin has argued that the invention of the stethoscope marked a major step in the redefinition of disease.
In the early 1960s, David Littmann, a Harvard Medical School professor, created a new stethoscope that was lighter than previous models and had improved acoustics, increased excursion of the diaphragm member in a Z-axis with respect to the plane of the sound collecting area.
Auscultation – kekradhu
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