However, the most commonly used size is 25g 40mm, 22g 70mm, 21g 50mm, 25g 50mm, 23g 38mm, and 27g 50mm. Different sizes pass fluid through them at different flow; called flow rates. For instance, an 18 gauge microcannula can transfer 50mm to 100mm (approx) of saline in an average of 1 minute.
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