A physician actually developed this technique, Dr. Heimlich. This is where the maneuver gets its name and that's what most people know it as. A few years ago though, Dr. Heimlich withdrew his affiliation with this title so that technically the name The Heimlich Maneuver should no longer be used. First aid manuals and references call this maneuver now Abdominal Thrusts. The technique is still the same though.
Pressure is applied on the victim's abdomen with an upward motion.
This compresses the diaphragm. The diaphragm is found across the bottom of your chest cavity beneath the ribcage. It's a dome shaped muscle that regulates your breathing by expanding and contracting, up and down. Relat it to the covering of a drum. It's a thin membrane.