The<unk>  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<unk>  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.
Shirley drain
Jackson-Pratt drain
Mikulicz's drain
Bonanno catheter
Bloxsom air lock
Drain 
Postural drainage
Word catheter