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A cannula is a tube that can be inserted into the body, often for the delivery or removal of fluid or for the gathering of data. In simple terms, a cannula can surround the inner or outer surfaces of a trocar needle thus extending the effective needle length by at least half the length of the original needle. It is also called an intravenous cannula. Its size mainly ranges from 14 to 24 gauge. Different-sized cannula have different colours as coded.