A medical grade device which is used to deliver oxygen to patients with breathing related disorders. The oxygen concentrator – stationary unit, is also equipped with special sieve beds and filters. The portable concentrator allows patients to leave the home and travel or attend outside events. The portable units are limited in oxygen storage capacity and need to be re-filled at a home base unit.  These will help to remove the Nitrogen from the air, in order to deliver fully purified oxygen to the patient.