Question: What was the name of the portable oxygen system developed by the inventor of the one-way flutter valve?

full_context: Document 1: Albert Starr: Albert Starr (born 1926), is a noted American cardiovascular surgeon and pioneer, inventor of the Starr heart valve, who resides and practices in the Portland, Oregon area. Starr is special adviser to OHSU Dean of Medicine Mark Richardson and OHSU President Joseph Robertson (OHSU) at Oregon Health and Science University. Albert Starr was born on June 1, 1926, in New York, New York. He received his B.A. degree from Columbia College (now Columbia University) in 1946 and his M.D. degree from Columbia College of Physicians and Surgeons in 1949. He then went on to do his internship at Johns Hopkins Hospital and his residency in general and thoracic surgery at the Bellevue and Presbyterian Hospitals of Columbia University. He was an assistant in surgeon at Columbia University until 1957, when he moved to Oregon—having been enticed, in part, by the Oregon Heart Association's promises to help fund his research and to take him salmon fishing. There he worked for the Crippled Children's Division at the University of Oregon Medical School (now the Oregon Health and Science University). Starr was an instructor in surgery when he met Lowell Edwards in September 1958. Starr has said of this meeting, "He was in his 60s and I was in my 30s, but there was no generation gap between us.
Document 2: Bruce Reitz: Bruce A. Reitz is a Board Certified Cardiothoracic Surgeon. Reitz is one of the foremost cardiac surgeons in the world and, during his term as chairman of the Department of Cardiothoracic surgery, he played a major role in keeping Stanford at the forefront of education, research and patient care in cardiac surgery. He obtained an undergraduate degree at Stanford University (B.S. 1966) a medical degree at Yale Medical School (M.D. 1970) and completed an internship at Johns Hopkins Hospital (1971) and residencies and fellowships at Stanford University Hospital (1972 and 78) the National Institutes of Health (1974). He joined the surgical faculty at Stanford University (1978) then became Chief of cardiac surgery at Johns Hopkins University (1982–92) and Chairman of the Department of Cardiothoracic Surgery at Stanford (1992–2005). In 1981, Reitz and his team performed the first successful heart-lung transplant, which also was the first time a lung had ever been transplanted . In 1995 he conducted another pioneering operation: he performed the first Heartport procedure, using a device that allows minimally invasive coronary bypass and valve operations. Reitz also played a major role in the resident education program at Stanford, which he reorganized and maintained as one of the top two or three programs in the country.
Document 3: Mended Hearts: Mended Hearts is a United States-based charity which functions as a support group for individuals suffering from heart disease. It was founded in 1952 by cardiac surgery pioneer Dwight Harken. Dr. Dwight Harken was the first surgeon in history to repeatedly perform successful heart surgery. Dwight Harken asked four post-surgery heart patients to get together to give encouragement and support to each other and prospective patients. It was there that these patients spoke of their "mended hearts". Mended Hearts offers a program for the families of children born with congenital heart defects known as Mended "Little" Hearts.
Document 4: Helen B. Taussig: Helen Brooke Taussig (May 24, 1898 – May 20, 1986) was an American cardiologist, working in Baltimore and Boston who founded the field of pediatric cardiology. Notably, she is credited with developing the concept for a procedure that would extend the lives of children born with Tetralogy of Fallot (the most common cause of blue baby syndrome). This concept was applied in practice as a procedure known as the Blalock-Taussig shunt. The procedure was developed by Alfred Blalock and Vivien Thomas, who were Taussig's colleagues at the Johns Hopkins Hospital.
Document 5: Valve: A valve is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category. In an open valve, fluid flows in a direction from higher pressure to lower pressure. The word is derived from the Latin "valva", the moving part of a door, in turn from "volvere", to turn, roll.
Document 6: Wade-Dahl-Till valve: The Wade-Dahl-Till (WDT) valve is a cerebral shunt developed in 1962 by hydraulic engineer Stanley Wade, author Roald Dahl, and neurosurgeon Kenneth Till.
Document 7: R Adams Cowley: R Adams Cowley (July 25, 1917 – October 27, 1991), the "Father of Trauma Medicine," was an American surgeon considered a pioneer in emergency medicine and the treatment of shock trauma. He was the founder of the United States's first trauma center at the University of Maryland, in 1958, after the US Army awarded Dr. Cowley $100,000 to study shock in people—the first award of its kind in the United States. The trauma unit at first consisted of two beds, and was later expanded to four beds. Many people called the four-bed unit the "death lab." Cowley was the creator of the "Golden Hour" concept, the period of 60 minutes or less following injury when immediate definitive care is crucial to a trauma patient's survival. He was a leader in the use of helicopters for medical evacuations of civilians, beginning in 1969, and founded the Society of Thoracic Surgeons. He also founded the nation's first statewide EMS system, called MIEMSS by Executive Order of Maryland's Governor Mandel, 1972, as well as the National Study Center for Trauma and EMS, enacted by Congress in 1986 and signed into law by President Ronald Reagan. He is also known for being one of the first surgeons to perform open-heart surgery and invented both a surgical clamp that bears his name and a prototype pacemaker that was used by Dwight D. Eisenhower.
Document 8: Henry Heimlich: 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.
Document 9: Pneumothorax: 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.
Document 10: Büchner flask: A Büchner flask, also known as a vacuum flask, filter flask, suction flask, side-arm flask or Kitasato flask, is a thick-walled Erlenmeyer flask with a short glass tube and hose barb protruding about an inch from its neck. The short tube and hose barb effectively act as an adapter over which the end of a thick-walled flexible hose (tubing) can be fitted to form a connection to the flask. The other end of the hose can be connected to source of vacuum such as an aspirator, vacuum pump, or house vacuum. Preferably this is done through a trap (see below), which is designed to prevent the sucking back of water from the aspirator into the Büchner flask.
Document 11: Flutter valve: 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.
Document 12: Endobronchial valve: 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.
Document 13: Double dump valve: Double dump valves, also known as double flap valves or double flap gates, are a type of airlock valve commonly used in industrial applications as a component in bulk material handling applications. Double dump valves are primarily used to discharge chunky or fibrous, bulk materials from hoppers, bins, and cyclones operating under positive or negative pressure. Double dump valves are used to discharge a flow of material while at the same time serving as an airlock transition point to preserve the pressure differential above and below the valve. This type of material handling valve is ideal for use with bulky or abrasive materials that would tend to jam or damage a rotary feeder.
Document 14: Sail switch: A sail switch, vane switch or flow switch is a mechanical switch that is switched on or off in response to the flow or non-flow of a fluid such as air or water. A sail switch typically operates through the use of a paddle which gets displaced due to the force of fluid moving past it. Sail switches find application in the detection of fluid flow and measurement of fan speeds. A sail switch might be used to protect a central heating system electric heating element from being energized before the air flow from the blower is established. Sail switches might also be used to alarm if a ventilation fan in a hazardous location fails and air flow has stopped. For some HVAC systems, a sail switch can activate an electronic air cleaner, a humidifier, or other equipment in response to airflow from the system fan.
Document 15: Atul Gawande: Atul Gawande (born November 5, 1965) is an American surgeon, writer, and public health researcher. He practices general and endocrine surgery at Brigham and Women's Hospital in Boston, Massachusetts. He is a professor in the Department of Health Policy and Management at the Harvard T.H. Chan School of Public Health and the Samuel O. Thier Professor of Surgery at Harvard Medical School. In public health, he is executive director of Ariadne Labs, a joint center for health systems innovation, and chairman of Lifebox, a nonprofit that works on reducing deaths in surgery globally.
ground_truth: Micro Trach