One of the most recognizable tools of the medical
profession, the stethoscope has served doctors and patients for nearly two
centuries.
Stethoscopes
have become so iconic that medical students at many universities
receive
a stethoscope along with their white coat
in their first year of training to symbolize their transition to becoming doctors.
Worldwide, the stethoscope market is worth around
$311
million in annual sales,
according to Global Industry
Analysts, Inc. Demand for these medical devices in the developing world is helping to drive
sales and offset losses related to the emergence of convenient handheld
ultrasound devices and other high tech medical devices.
History
of the Stethoscope
The stethoscope has its roots in early 19
th
century France. Rene-Theophile-Hyacinthe Laennec, a physician, used a rolled-up
cylinder of paper to listen to a heartbeat. Laennec observed the amplification
and developed a hollow wooden baton for physicians to use to listen to the
heart. The cylinder was about six inches long, and its bore was shaped like a
trumpet.
From there, other physicians innovated and further developed the stethoscope. These devices were made of wood and incorporated rubber tubes and earplugs. Further innovation led to the development of what we now
recognize as a conventional stethoscope in the 1840s and 1850s. These stethoscopes incorporated rubber tubes, and ivory or ebony knobs for earpieces.
Differential stethoscopes that used two chest-pieces to allow doctors to
compare sounds in two different places were also developed at this time.
The basic binaural stethoscope was developed in the early 20
th century. Electronic stethoscopes also were developed at
this time.
Uses
for Stethoscopes
Stethoscopes
have a variety of uses by medical professionals. Some common uses of these
medical devices include:
Monitoring the Heart – For trained medical staff, a
wealth of information can be revealed by listening to a patient’s chest with a
stethoscope. Doctors and nurses can hear atria and ventricles working, and
other parts of the heart doing their work. Medical staff can also pick up tell-tale
signs that these systems are not working properly.
Stethoscopes are often the primary diagnostic
tool for detecting heart murmurs and other serious conditions.
Monitoring the Lungs – Doctors use these devices to detect problems with breathing. A
trained physician can listen to patients take a deep breath and detect problems
based on sounds heard as air enters the lungs. Doctors can detect fluid in the
lungs or constriction of the lungs, and various other problems, prompting them
to make further observations and diagnose the problem.
Monitoring the Bowels – A physician can use a
stethoscope to detect bowel problems by placing the device on a patient’s
abdomen and listening as food and liquid move through the patient’s stomach and
on to his or her intestines. Most of the time, the bowels will make low-pitched
gurgles every few seconds. These sounds may occur more or less frequently,
depending on a patient’s condition.
Measuring Blood Pressure – These devices are
commonly used as a tool to measure blood pressure, alongside a blood pressure
cuff. Medical professionals place the cuff on the patient’s arm, inflate it,
and use the stethoscope to listen for the patient’s pulse as the cuff is
deflated.
Ensuring
Quality
Stethoscopes
have to be able to detect faint, subtle sounds in order to be useful. Therefore
very
high standards must be maintained
in their
manufacturing. Air leaks in a stethoscope can greatly impair their utility. Top
quality instruments must be carefully inspected to make sure that all of the
components fit snugly together and that junctions are airtight.
There are a variety of risk factors that can cause
air leaks in a stethoscope. Quality inspectors must search for cracking, small
holes, weak areas in the metal, etc. Manufacturers often test the devices by
placing them in a machine that will blow air through the medical devices to
search for leaks. Other machines will test the tightness of the junctions by
tugging on components to determine whether everyday use will cause the pieces
to separate.
Pre-manufacturing inspection is also necessary to
ensure that quality raw materials are used. After the devices are assembled,
each should also be checked to ensure acoustic reliability.
The
Future
Stethoscopes remain a mainstay of most doctors’ medical equipment, but they are beginning to
be supplanted by pocket-size ultrasound devices that provide greater detail and
accuracy than traditional stethoscopes. For the near future, the high price of
these devices will keep stethoscopes as doctors’ primary tool. It is expected
that as the technology continues to improve, and as manufacturers learn how to
produce the devices more inexpensively, they will take a greater share of the
market. The devices will likely still enjoy wide usage, however, particularly
in situations where access to electricity is limited.
Use
& Maintenance
Doctors and other health care professionals who use stethoscopes undergo rigorous
and extensive training to learn to interpret sounds heard via this medical
device. Many specialize in a select set of readings, such as the sounds made by
healthy and unhealthy lung systems.
To ensure the accuracy of stethoscope readings,
these medical devices must be properly maintained. Medical professionals should
regularly check their equipment for air leaks or parts that need replacing.
They should also regularly clean stethoscopes with rubbing alcohol and mild,
soapy water to remove debris that may impair the device.
Keeping the devices clean is of vital importance.
Global Industry Analysts, Inc. estimates that 90 percent of doctors’ stethoscopes and 79
percent of nurses’ stethoscopes are contaminated. This contamination leads to
about 2 million nosocomial infections each year. Reducing preventable
infections is a major priority of hospitals and other health care providers.
Medical professionals searching for stethoscope
suppliers should check online reviews and perform other due diligence to ensure
they are obtaining equipment from well-reputed suppliers. For quality devices,
medical professionals should check out the
inventory
available at Medical Device Depot
. Medical Device Depotcarries known and respected brands of medical equipment, and the company’s knowledgeable staff are always ready to answer any customer questions.