IV cannula 20G
Intravenous catheters are thin, flexible tubes that are inserted into a patient's vein to deliver medications, fluids, or nutrients directly into the bloodstream. The size of an catheter is indicated by its gauge, which is a measurement of the diameter of the catheter's lumen, or the inner opening. A 20G catheter is a relatively small-gauge catheter, with a diameter of approximately 0.8 mm. 20G catheters are commonly used in clinical settings for administering medications, fluids, and nutrients, and they are typically inserted into veins in the hand, arm, or lower extremities. The smaller diameter of the 20G catheter makes it less likely to cause discomfort or damage to the veins during insertion, and it is also less likely to occlude (become blocked) than larger-gauge catheters.