drain  any device by which a channel or open area may be established for the exit of fluids or purulent material from any cavity, wound, or infected area. cigarette drain, a drain made by drawing a strip of gauze or surgical sponge into the lumen of a rubber tube. controlled drain, a drain made by pressing a square of gauze into the wound and then packing with gauze strips, the ends of which, together with the corners of the square, are left projecting from the wound. double-lumen drain, a drain, such as a sump drain, consisting of two tubes, one inside the other. Jackson-Pratt drain, a closed wound drainage system comprising a drainage tube and collection vessel. Mikulicz drain, a drain formed by pushing a single layer of gauze into a wound or cavity, then packing with several thick wicks of gauze as the original layer is forced farther and farther into the defect. Penrose drain, a thin rubber tube, usually 0.5 to 1 inch in diameter.    stab wound drain, drainage accomplished by bringing out the drain through a small separate wound adjacent to the major operative incision.    sump drain, a double-lumen drain that allows air to enter the drained area through the smaller lumen and displace fluid into the larger lumen.    sump-Penrose drain, a triple-lumen drain formed by placing a double-lumen tube within a Penrose drain.    triple-lumen drain, a drain consisting of three tubes placed one inside another. Placement of Penrose drain because of excessive bleeding.