PSA: in medical documents, when they use the word "ventilator", they usually mean the kind that requires intubating the patient and has very precise pressure and volume control.
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If you want to
#buildventilators to help with the COVID19 crisis you're going to have to match the specs on the kind of ventilators used for long-term care of patients with ARDS. Bag ventilators are for emergency first aid and temporary breathing support.Show this thread -
Here's a doctor demonstrating how you use an ambu bag. https://www.youtube.com/watch?v=1goz1l28kUQ … Obviously, the pressure isn't precise here, since he's just squeezing the bag by hand. But I think (?) that's just erring on the side of too little pressure because you're going to escalate anyway.
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I have no idea but I wouldn't be surprised if microcontrollers and servos could hit that accuracy.
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I am *so* not a hardware engineer, so I have no opinion on whether it's possible or not. I just notice that many of the project writeups I've found online don't even *measure* how precise the pressure is! If you're not measuring you're probably not hitting the target.
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Isn't mmHg the usual measurement unit in medicine? Mercury is >10x the density of water.
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Well, mmHg has the same order of magnitude as cmH2O. At a guess, I'm thinking this implies that cmH2O (like mmHg for blood pressure) is likely an acceptable unit in practice, but machines that go to tenths are useful for collecting better data in a clinical setting.
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If anyone actually manages to build one it’s going to kill whoever they use it on.
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