What is the purpose of the Heimlich maneuver?

The Heimlich Maneuver is a first-aid technique for someone who is choking because food or another swallowed object is obstructing his or her airway. Using an upward abdominal thrust, the Heimlich maneuver compresses the lungs and forces air up into the windpipe (trachea).

The usual technique is done while standing behind the victim. Reach around his waist to the abdomen just above the navel and below the sternum. Clench one fist and use the other to press it into the abdomen. Lift both fists sharply inward and upward to compress the lungs. Repeat if necessary unless vomiting occurs.