Question: What was the name of the portable oxygen system developed by the inventor of the one-way flutter valve?
Related documents: [0]  [DOC] Henry Judah Heimlich (] ; February 3, 1920 – December 17, 2016) was an American thoracic surgeon and medical researcher. He is widely credited as the inventor of the Heimlich maneuver, a technique of abdominal thrusts for stopping choking, described in "Emergency Medicine" in 1974. He also invented the Micro Trach portable oxygen system for ambulatory patients and the Heimlich Chest Drain Valve, or "flutter valve," which drains blood and air out of the chest cavity. [END] 
[1]  [DOC] A flutter valve (also known as the Heimlich valve after its inventor, Henry Heimlich) is a one-way valve used in respiratory medicine to prevent air from travelling back along a chest tube. [END] 
Answer: 
Micro Trach
Micro Trach