best stethoscope guides
TRANSCRIPT
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
Stethoscopes are simple yet effective tools that allow doctors to listen to the internal sounds in a patient’s body. Doctors can use stethoscopes to listen to a patient’s heart, intestines, breathing, and blood flow.
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.
Different types of stethoscope
FIRST STETHOSCOPE in 1816
A French doctor named Rene-
Theophile-Hyacinthe Laennec
invented the first stethoscope
in 1816.
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
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.
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.
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 assume
uncomfortable positions during the examination. He offered the suggestion
of making hisinstrument binaural, and may have, as
there are only sketches of his instrument.
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
ELECTRONIC STETHOSCOPEaudible 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
* Reference http://www.stethoscopeguides.com
/ http://discoverd-world.blogspot.co
m.au/2011/05/discovery-history-stethoscope.html
http://inventors.about.com/gi/dynamic/offsite.htm?site=http://www.antiquemed.com/tableofcon.htm
http://www.instabriefs.com/medical-devices/stethoscopes/stethoscopes-fast-facts.php
http://www.antiquemed.com/test/binaural_stethoscope.htm