Oxymed Portable Oxygen Concentrater Available in Chennai Oxymed Concentrater Best price in Chennai Portable Oxygen Concentrater in Madurai Oxygen concentrators are medical devices that help you take in oxygen if you have a condition that affects your lungs. You may also benefit from using an oxygen concentrator if you spend time in a high-altitude area. Whether you're using it every day or just sometimes, it may take some time to get comfortable. Pressure swing adsorption (PSA) oxygen concentrators use a molecular sieve to adsorb gases and operate on the principle of rapid pressure swing adsorption of atmospheric nitrogen onto zeolite minerals at high pressure.