Pulse Oxygen Generator on Shabbos

Question

 Is it permitted to use a portable oxygen concentrator on Shabbat that operates with pulses (i.e., it generates/releases oxygen only when breathing)? There are, of course, alternatives such as a continuous-flow concentrator or oxygen tanks, but those options are more cumbersome and make movement and functioning more difficult. 

Answer

Shalom u'vracha 

 It is not permitted to use a device that is activated by breathing. 

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