cannula

1. (medicine) A tube inserted into the body to drain or inject fluid.Examples: "Two or three cannulæ are requisite also for washing out the sinuses."; "The cannula had come askew in his nose and he pushed it straight, his hand moving slowly, like the hand of a man who is dreaming with his eyes open."

2. (aviation) A hose or tube that connects directly from an oxygen bottle or other source to the user's nose, commonly used by aircraft pilots or others needing direct oxygen breathing apparatus.