Would a 1965 "army medical respirator* "
I mean – do COVID-19 patients need all the additional features of a current medical ventilator?
The reason I ask – this device would be easy and fast to produce, would be both respiratory assistor and controller and only needs a pressurized air / oxygen source to work.
With a needle valve in the pressure line the doctor can control the pressure /volume and I don't see a reason why one could not add a PEEP valve.
Beats the hell out of a hand pressed bag. (I would think)
Is there a medical reason why that would not be sufficient for most patients that need ventilation?
* wikipedia article relevant section:
In 1965, the Army Emergency Respirator was developed in collaboration with the Harry Diamond Laboratories (now part of the U.S. Army Research Laboratory) and Walter Reed Army Institute of Research. Its design incorporated the principle of fluid amplification in order to govern pneumatic functions. Fluid amplification allowed the respirator to be manufactured entirely without moving parts yet capable of complex resuscitative functions. <5> Elimination of moving parts increased performance reliability and minimized maintenance. <6> The mask is composed of a poly(methyl methacrylate) (also known as lucite) block, about the size of a pack of cards, with machined channels and a cemented and/or screwed-in cover plate. <7> The reduction of moving parts cut manufacturing costs and increased durability. <6>
The bistable fluid amplifier design allowed the respirator to function as both a respiratory assistor and controller. It could functionally transition between assistor and controller automatically based on the patient’s needs. <7> <6> The dynamic pressure and turbulent jet flow of gas from inhalation to exhalation allowed the respirator to synchronize with the breathing of the patient. <8>
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