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2. Hypodermic needle - Wikipedia

   en.wikipedia.org/wiki/Hypodermic_needle

   Various needle lengths are available for any given gauge. Needles in common medical use range from 7 gauge (the largest) to 34 (the smallest). 21-gauge needles are most commonly used for drawing blood for testing purposes, and 16- or 17-gauge needles are most commonly used for blood donation, as the larger luminal cross-sectional area results ...

3. Injector pen - Wikipedia

   en.wikipedia.org/wiki/Injector_pen

   Today, pen needles are manufactured at shorter needle lengths than required for typical vial and syringe administration, which decreases the pain associated with injection. [2] They are available in multiple lengths and gauge of needle , including 3.5mm, 4mm, 5mm, and 8mm lengths, and 31 through 34 gauge. [ 8 ]

4. Syringe - Wikipedia

   en.wikipedia.org/wiki/Syringe

   Autoinjector, a device to ease injection, e.g. by the patient or other untrained personnel. Hippy Sippy; Jet injector, injects without a needle, by squirting the injection fluid so fast that it makes a hole in the skin. Luer taper, a standardized fitting system used for making leak-free connections between syringe tips and needles.

5. Microneedles - Wikipedia

   en.wikipedia.org/wiki/Microneedles

   [7] [1] Some microneedles are made of a drug to be delivered to the body but are shaped into a needle so they will penetrate the skin. The microneedles range in size, shape, and function but are all used as an alternative to other delivery methods like the conventional hypodermic needle or other injection apparatus. Stimuli-responsive ...

6. Intravenous therapy - Wikipedia

   en.wikipedia.org/wiki/Intravenous_therapy

   Ported cannulae have an injection port on the top that is often used to administer medicine. [32]: 349–354 The thickness and size of needles and catheters can be given in Birmingham gauge or French gauge. A Birmingham gauge of 14 is a very large cannula (used in resuscitation settings) and 24-26 is the smallest.

7. Subcutaneous administration - Wikipedia

   en.wikipedia.org/wiki/Subcutaneous_administration

   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 ...