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I use a finger oxymeter to know my saturation. The Inogen pulse units put out the rough equivalent of oxygen that you would have gotten from a constant flow device but they only put it out when you breathe in triggering a repetitive series of pulses kind of like an aqualung. It charges a set of tubes with a zinc mineral powder the absorbs the Nitrogen out of our air providing a bit more enhanced Oxygen mixture is my understanding. You can look it up on the internet as to “How do oxygen Concentrators work”.
Their Constant flow units just blow the same enhanced oxy mix from Zinc filter towers constantly across the nasal area so that you waste at least half your breathing out time without breathing in any enhanced air (but now there are those medallion units that supposedly provide kind of double time oxy by storing the part blown at you while you are exhaling and feed it back to you when you breathe in.
I have seen negative feed back on comfort of those medallions, but maybe someday the mfrs will listen to the patient instead of the designer who never had to use one of these. Good day all.