Can anyone explain why normal ventilators don't just use flow meters on compressed air with a solenoid? A standard pilot valve pneumatic solenoid can switch much faster than this. with regulated air pressure, and an air filter on the air, it seems possible to make it work pretty easily just using compressed air.
It's a lot more complicated to modulate the pressure. You need to titrate the pressure to each patient/setup, and often inhale vs exhale. Motor with ESC? Easy. Solenoid valve has only on/off, so you have to manually tune a pressure valve for each level. Also the pilot kind like those in sprinkler systems don't work well with low pressure air.
