Insulin pumps may be like 'electrical injectors' attached to a temporarily implanted catheter or cannula. Blood samples may be drawn directly after the initial IV cannula insertion. A venous cannula removes oxygen depleted venous blood from a patient's body. An arterial cannula infuses oxygen-rich blood into the arterial system. The arm of the condemned person is swabbed with alcohol before the cannula is inserted. An intravenous cannula is required for the administration of iodinated contrast. In certain circumstances, oxygen may be delivered via a nasal cannula instead of a mask. Clear water or saline is then irrigated through the cannula. It is also called an intravenous (IV) cannula. This followed by an injection of fluorouracil into the cannula or central line. Respiratory gas humidification allows the high flows to be delivered comfortably via the cannula. It then involves using a cannula and negative pressure to suck out fat. The two ends of the cannula are connected similarly. He wore a cannula and appeared short of breath. Special aviation cannula systems are manufactured for this purpose.