Wife was in contact with her old university and asked me at the family table what we could do at work from a list of medical pieces. She was surprised that our third daughter came with a strange but probably working idea: Lego
The Lego Mindstorm control unit to build robots and such could be used to stear a breathing system. We have unused programmable microcontrollers (much smaller than LEGO) at work, 3D printers and material, ....
I asked how my daughters how they would build a breathing unit. After a small discussion for 5 minutes: ambu bag and old electrical typewriter steared by a raspberry. Self printed vent. Could perhaps even work.
Lego, that was a nice idea. With all the kids and students at home, LEGO Mindstorm is a part of tech classes at school, lot of unused resources in the kids at home it seems. Or Raspberry Pi if people have one, or ....
The breathing project at university of marburg:
https://www.uni-marburg.de/de/fb13/halbleiterphotonik/the-breathing-project/the-breathing-project-1