#$%^&*AU2019204167A120190711.pdf#####Abstract A therapeutic gas delivery device comprising: an inlet to connect to a source of therapeutic gas； an outlet to connect to a device that introduces the therapeutic gas to a patient； at least one binary control valve in fluid communication with the inlet and outlet that delivers a constant flow of the therapeutic gas； at least one proportional control valve in fluid communication with the inlet and outlet that delivers a variable flow of the therapeutic gas； and a control system that delivers the therapeutic gas through one or more of the binary control valve and the proportional control valve.1/2 0") C>；~ D CD .0~ C.CD -CD oc I Il I-r
