Question: What was the name of the portable oxygen system developed by the inventor of the one-way flutter valve?
Context: Portable oxygen concentrator (POC) is a portable device used to provide oxygen therapy to people requiring greater oxygen concentrations than the levels of ambient air.  It is similar to a home oxygen concentrator, but is smaller in size and more mobile.  The portable oxygen concentrator makes it easy for patients to travel freely; they are small enough to fit in a car and many concentrators are now FAA-approved for use on airplanes. The Pin Index Safety System, or PISS, is a safety system that uses geometric features on the yoke to ensure that pneumatic connections between a gas cylinder and a machine that uses pressurized gases are not connected to the wrong gas yoke.  This system can be seen on an anesthesia machines and portable oxygen administration sets.  It has no purpose other than a physical barrier to connecting the wrong cylinder. A pneumothorax is an abnormal collection of air in the pleural space between the lung and the chest wall.  Symptoms typically include sudden onset of sharp, one-sided chest pain and shortness of breath.  In a minority of cases the amount of air in the chest increases when a one-way valve is formed by an area of damaged tissue, leading to a tension pneumothorax.  This condition can cause a steadily worsening oxygen shortage and low blood pressure.  Unless reversed by effective treatment, it can result in death.  Very rarely both lungs may be affected by a pneumothorax.  It is often called a collapsed lung, although that term may also refer to atelectasis. VTEC (Variable Valve Timing and Lift Electronic Control, pronounced "vee-tech") is a system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine, resulting in higher performance at high RPM, and lower fuel consumption at low RPM.  The VTEC system uses two camshaft profiles and hydraulically selects between profiles.  It was invented by Honda engineer Ikuo Kajitani.  It is distinctly different from standard VVT (variable valve timing) which advances the valve timing only and does not change the camshaft profile or valve lift in any way. A self-contained self-rescue device, SCSR, self-contained self-rescuer, or air pack is a portable oxygen source for providing breathable air when the surrounding atmosphere lacks oxygen or is contaminated with toxic gases, e.g. carbon monoxide.  A SCSR is usually a closed-circuit breathing apparatus with a chemical oxygen generator or a compressed oxygen cylinder and a carbon dioxide absorber.  SCSRs are most commonly used in some coal mines, are intended for one person, and usually supply at least one hour of oxygen.  SCSRs are intended to facilitate escape from mines after a fire or explosion.  They are also used by people working with machinery on the surface of a mine or pit, in case they become covered by such materials as coal or sand.  Usage of SCSRs for other purposes is discouraged. An endobronchial valve is an implantable medical device—a small, one-way valve, which is implanted in an airway in the pulmonary system to treat one of several lung conditions.  Endobronchial valves are typically implanted using a flexible delivery catheter advanced through a bronchoscope, and thus they are minimally invasive.  The valves are also removable if they are not working properly. 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. 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. The nasal cannula (NC) is a device used to deliver supplemental oxygen or increased airflow to a patient or person in need of respiratory help.  This device consists of a lightweight tube which on one end splits into two prongs which are placed in the nostrils and from which a mixture of air and oxygen flows.  The other end of the tube is connected to an oxygen supply such as a portable oxygen generator, or a wall connection in a hospital via a flowmeter.  The cannula is generally attached to the patient by way of the tube hooking around the patient's ears or by elastic head band.  The earliest, and most widely used form of adult nasal cannula carries 1–5 litres of oxygen per minute. Vika or TGK is an oxygen generating system for spaceflight.  It is a SFOG, or solid-fuel oxygen generator, a kind of chemical oxygen generator.  It has been used on the retired Mir space station and the International Space Station.  It was originally developed by Roscosmos to supplement the "Elektron" oxygen system on "Mir".  A Vika module, also known as a "candle", contains about one liter of lithium perchlorate and can provide oxygen for one person for 24 hours.
Answer: Micro Trach