ISOLATING RESPIRATORY SYSTEM Russian patent published in 1999 - IPC

FIELD: protection of human respiratory organs against harmful effect of ambient air, applicable in emergencies or during work in atmosphere unsuitable for breathing. SUBSTANCE: isolating respiratory system has a face part, inspiratory and expiratory limbs, inspiratory and expiratory vessels, excessive pressure valve, breathing gas source, absorption cartridge and an ejector pump. The ejector pump capacity exceeds the value of average pulmonary ventilation at execution of heavy work, and the volume of each inspiratory or expiratory vessel makes up at least 1/2 of the inspiratory volume that is maximum possible as far as physiology is concerned. EFFECT: improved operating characteristics due to reduction of concentration of carbon dioxide in inspired air, simplified design. 1 dwg