Hypodermic needle - Wikipedia, the free encyclopedia

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** Hypodermic needle **

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Different bevels on hypodermic needles
Syringe on left, hypodermic needle with attached colour coded Luer-Lok
connector on right

A *hypodermic needle* (from Greek ὑπο- (under-), and
δέρμα (skin)) is a hollow needle commonly used with a
syringe to inject substances into the body or extract fluids from it. They
may also be used to take liquid samples from the body, for example taking
blood from a vein in venipuncture. Large bore hypodermic intervention is
especially useful in catastrophic blood loss or shock.

A hypodermic needle is used for rapid delivery of liquids, or when the
injected substance cannot be ingested, either because it would not be
absorbed (as with insulin), or because it would harm the liver. There are
many possible routes for an injection.

The hypodermic needle also serves an important role in research
environments where sterile conditions are required. The hypodermic needle
significantly reduces contamination during inoculation of a sterile
substrate. The hypodermic needle reduces contamination for two reasons:
First, its surface is extremely smooth, which prevents airborne pathogens
from becoming trapped between irregularities on the needle's surface, which
would subsequently be transferred into the media (e.g. agar) as
contaminants; second, the needle's surface is extremely sharp, which
significantly reduces the diameter of the hole remaining after puncturing
the membrane, which consequently prevents microbes larger than this hole
from contaminating the substrate.^[1]^[2]^[3]^[4]

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Source: en.wikipedia.org/wiki/Hypodermic_needle

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