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The Shirley wound drain or sump drain is a suction drain with an intake tube that provides air to the bottom of the main tube. This allows a continuous flow of suction so that the tube doesn't get blocked. The Shirley drain is a double-lumen drainage tube intended to aspirate efficiently the contents of a fresh surgical wound. It removes the blood oozing from the walls of the wound cavity before it clots.^[1]

The Shirley drain was invented in 1957 by surgeon and inventor Dr. Harold W. Andersen.^{[citation needed]}

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