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Human lungs are 1-1.6 gallons.
Use something common like a 5gal bucket.
Print a plunger/rod/crank. Glue some kind of seal.
Use some kind of very standard motor at 20rpm?
A check valve that opens to a tube/mask at a certain pressure to creates a burst of flow.
(Maybe too much new engineering required and not sterile)
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Meanwhile other things are still happening.
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