OP-Vent
https://op-vent.stanford.edu/ A different take: without an ambu bag. Claims: A mechanical ventilator design developed by Dally can be assembled quickly, using off-the-shelf parts with a total cost of around $400 — making it an accessible and affordable alternative to traditional, dedicated ventilators, which can cost $20,000 or more. Includes just two central components — a solenoid valve and a microcontroller. The design is called the OP-Vent , and in the video below you can see how bare-bones it is in terms of hardware compared to existing alternatives, including some of the other more complex emergency-use ventilator designs developed in response to COVID-19. Has been developed using input from mechanical engineers and doctors, including Dr. Andrew Moore, a chief resident at Stanford University and Dr. Bryant Lin, a medical devices expert and company co-founder. Can be assembled in as little as five minutes, and is small enough to fit in a Pelican case for easy transpor...