Stethoscope Guides

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STETHOSCOPE

• www.stethoscopeguides.com

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WHAT IS STETHOSCOPE?

• A stethoscope is a medical instrument used to
  listen to sounds produced in the body, especially
  those that emanate from the heart and lungs

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Stethoscopes are simple yet effective tools that
allow doctors to listen to the internal sounds in
a patients body. Doctors can use stethoscopes to
listen to a patients heart, intestines,
breathing, and blood flow.
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The stethoscope is a very important noninvasive
tool used by medical professionals and all health
care workers and students will be trained in the
use of them.
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Different types of stethoscope
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FIRST STETHOSCOPE in
1816

• A French doctor named Rene-Theophile-Hyacinthe
  Laennec invented the first stethoscope in 1816.

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Laennec stethoscope

• This cylindrical stethoscope is made with three
  parts fitting together by wood screw thread and
  brass tube fitting with an overall length of 12.6
  inches and a diameter of 1.5 inches. Both ends
  are slightly concave

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Picture after the fresco by Theobald Chartran in
the Sorbonne commemorating the invention of the
stethoscope in 1816. The photo on the right shows
Laennec examining a young boy by "mediate"
auscultation with his stethoscope. The picture is
taken from a painting by Robert A.
Thom, copyrighted in 1960.
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BINAURAL STETHOSCOPE

• In the early 1850's there was a rush of designs
  for a new stethoscope that used both ears. This
  new'Bi-aural' or 'Binaural' instrument was felt
  to be the future of auscultation.

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• The idea belonged to Nicholas Comins , who
  devised a stethoscope that hedescribed as "a
  bent tube" that had several hinges, allowing the
  physician to not have to assumeuncomfortable
  positions during the examination. He offered the
  suggestion of making hisinstrument binaural, and
  may have, as there are only sketches of his
  instrument.

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ACOUSTIC STETHOSCOPE

• Acoustic stethoscopes are familiar to most
  people, and operate on the transmission of sound
  from the chest piece, via air-filled hollow
  tubes, to the listener's ears

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ELECTRONIC STETHOSCOPE
audible sounds are magnified through an amplifier
to earphones, of which there may be more than one
set, and may be broadcast through loudspeakers,
but in both instances the results are mediocre
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Reference

• http//www.stethoscopeguides.com/
• http//discoverd-world.blogspot.com.au/2011/05/dis
  covery-history-stethoscope.html
• http//inventors.about.com/gi/dynamic/offsite.htm?
  sitehttp//www.antiquemed.com/tableofcon.htm
• http//www.instabriefs.com/medical-devices/stethos
  copes/stethoscopes-fast-facts.php
• http//www.antiquemed.com/test/binaural_stethoscop
  e.htm