An integrally molded ventilation interface includes a hollow bellows-like structure and two nasal prongs extending from a top surface of the bellows. A pair of headgear strap flanges can also be molded integrally with the ventilation interface. The nasal prongs provide a first sealing interface between...http://www.google.de/patents/US20050028822?utm_source=gb-gplus-sharePatent US20050028822 - Sealing nasal cannula
