A system for supplying supplemental oxygen to a patient includes a nosepiece and an oxygen tube holder. The nosepiece has a conical section with a truncated tip and a flexible annular skirt and is formed with a primary axial oxygen passageway and a pair of lateral secondary oxygen passages which lead...http://www.google.de/patents/US4660555?utm_source=gb-gplus-sharePatent US4660555 - Oxygen delivery and administration system
