Patent ID: 6871645
Filing Date: 2005-03-29
Classification: A61M,A63B

Abstract:
1. A reduced-oxygen breathing apparatus comprising: (h) a vessel for gas mixing, wherein said gas mixing vessel is a hollow loop; (i) an ambient air inlet, said inlet being in fluid communication with said gas mixing vessel; (j) an outlet, said outlet being in fluid communication with said gas mixing vessel on one end and providing a controlled gas mixture to a subject at the opposite end; (k) an oxygen concentration sensor, said sensor being in fluid communication with the gas mixing vessel; (l) a nitrogen gas supply, said nitrogen gas supply being in fluid communication with said gas mixing vessel; (m) a nitrogen valve in fluid communication with said gas mixing vessel and said nitrogen gas supply, wherein said nitrogen valve controls flow of said nitrogen gas supply to said gas mixing vessel; and (n) a controller for said gas mixing, wherein: further comprising a nitrogen concentration sensor in fluid communication with said loop.