The ventilation interface for sleep apnea therapy interfaces a ventilation device to the patient's airways. The ventilation interface includes a pair of nasal inserts made from flexible, resilient silicone which are oval shaped in cross-section and slightly tapered from a base proximal the ventilation...http://www.google.co.uk/patents/US6997177?utm_source=gb-gplus-sharePatent US6997177 - Ventilation interface for sleep apnea therapy
