DOSED OXYGEN SYSTEMS WITH DELIVERY TUBE ANTI-BLOCKAGE FEATURES AND A METHOD FOR DELIVERING RESPIRATORY GAS

摘要

Oxygen-delivery systems (10B) are described. The systems (10B) maysupply emergency respiratory gas on demand to aircraft passengers. To reducerisk of blockage of tubes delivering anti-blocking gas to the face masks wornbythe passengers, the systems may be designed to provide a continuous trickleflow of respiratory gas, or one or more anti-blocking pulses of gas, into adelivery tube (34, 42).