An independent mechanical device designed for accurate mixing of air and oxygen (O2) with O2 concentrations ranging from 21% to 100% (oxygen/air proportioner) that are appropriated for breathing in patients who need a concentration of O2 above the normal co...
An independent mechanical device designed for accurate mixing of helium (He) and oxygen (O2) with concentrations ranging from 80% He and 20% O2, or 70% He and 30% O2 (helium/oxygen proportioner) that are appropriated for breathing in a patient who is indica...