s a sump tube where the physician desires to keep the stomach continuously and completely evacuated of swallowed air, swallowed saliva, gastric secretions or fresh blood the nasogastric (NG) tube is used with a vacuum source. The original Levin tube failed Dr. Harold W. Andersen in 1958 and he endeavored to engineer a double lumen NG tube to reduce the vacuum of the aspiration lumen by adding a vent lumen to the outside including an anti-reflux filter at the proximal end of the vent lumen and additional markings for placing the tube in the patient. This was the first double-lumen nasogastric tube.