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" ... Doctor holding oxygen ambu bag over patient given oxygen to patient by endotracheal tube in ICU. ... "
" ... The hacking community also heard the call, and dozens of projects appeared to find ways to produce ventilators easily, at low cost, and with commonly available parts. Many of these projects worked by taking well known manual ventilators, sometimes known as bag valve masks or “ambu bags.” These simple ventilators just use an air bladder that an emergency first responder can squeeze with their hands to force air into the lungs of the patient. You can do basic ventilation of a patient this way, but a human has to sit there squeezing the bag 24/7. Many teams built devices to have motors squeeze that bag. Since the bag is an approved ventilator, and cheap, it is hoped that is a quick path to a suitable device. ... "