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2. Hypodermic needle - Wikipedia

   en.wikipedia.org/wiki/Hypodermic_needle

   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 in lower fluid shear, reducing harm to red blood cells ...

3. Injector pen - Wikipedia

   en.wikipedia.org/wiki/Injector_pen

   Comparison of 4mm and 12.7mm pen needle sizes. All injector pens other than those designed for single use require the use of single-use replaceable pen needles for each injection. These pen needles come in various lengths to accommodate varying depths of subcutaneous tissue under the top of the skin. [5]

4. Birmingham gauge - Wikipedia

   en.wikipedia.org/wiki/Birmingham_gauge

   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).

5. Syringe - Wikipedia

   en.wikipedia.org/wiki/Syringe

   U-100 syringe sizes and markings. 1cc (1 mL) Syringe Holds maximum: 100 units [10] Numbered in: 10 unit increments [10] Smallest line measures 2 units: [11] BD [10] ReliOn [12] Monoject [13] (all but 31 gauge needle) Smallest line measures 1 unit: Easy Touch [14] Precision Sure Dose [13] 1/2cc (0.5 mL) Syringe Holds maximum: 50 units [15 ...

6. Patient one of first to be fitted with new pacemaker the size ...

   www.aol.com/patient-one-first-fitted-pacemaker...

   A 76-year-old man has become one of the first people in the country to be fitted with a new pacemaker 10 times smaller than a standard device and with a battery that can last for up to 20 years.

7. Microneedles - Wikipedia

   en.wikipedia.org/wiki/Microneedles

   Another concern is that incorrectly applied arrays could leave foreign material in the body. Although there is a lower risk of infection associated with microneedles, the arrays are more fragile than a typical hypodermic needle due to their small size and thus have a chance of breaking off and remaining in the skin.