The Heimlich maneuver is a first aid method invented by a man named Heimlich to treat acute respiratory obstruction by shocking the abdomen, which is a more recognized effective first aid method to treat acute respiratory obstruction in the world. The method is: if the patient is awake, the operator stands behind the patient, makes a fist from both sides of the waist to the front of the abdomen, overlaps and then uses the large fissure muscle to shock the patient from the upper abdomen inward and upward rapidly, so that the diaphragm is raised and the pressure in the chest cavity is increased, so that there is a force to the lungs and the respiratory tract, and the object is discharged from the mouth. If the person is more obese or pregnant, instead of shocking the abdomen, you can press hard on the lower part of the sternum, which can also achieve the above effect.