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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 ...
The first hypodermic needle was first used by Dr. Alexander Wood and immediately efforts were made to improve the design. It was not until 1954, with the need for massive syringe distribution of Dr. Salk's polio vaccine, that the first disposable syringes were created. Initially, they were made of glass.
She preferred hypodermic needles because of their strength and tactile feedback: "A 22-gauge, 3.8-cm (1.5-in) needle is usually suitable for most superficial muscles. In hyperalgesic patients, a 25-gauge, 3.8-cm (1.5-in) needle may cause less discomfort, but will not provide the clear feeling of the structures being penetrated by the needle and ...
The gauge of the needle used can range from 25 gauge to 27 gauge, while the length can vary between 1 ⁄ 2-inch to 5 ⁄ 8-inch for injections using a syringe and needle. [ 3 ] : 722 For subcutaneous injections delivered using devices such as injector pens , the needle used may be as thin as 34 gauge (commonly 30–32 gauge), and as short as 3 ...
It consists, from front to rear, of a hypodermic needle, two bilateral flexible "wings", flexible small-bore transparent tubing (often 20–35 cm long), and lastly a connector (often female Luer). This connector attaches to another device: e.g. syringe , vacuum tube holder/hub, or extension tubing from an infusion pump or gravity-fed infusion ...
The gauge starts at the lowest gauge number of 5Ø or 00000, corresponding to the largest size of 0.500 inches (12.7 mm), and runs to the highest gauge number of 36, corresponding to the smallest size of 0.004 inches (0.10 mm). Size steps between gauges range from 0.001 inches (0.025 mm) between high gauge numbers to 0.046 inches (1.2 mm ...
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