General > General Technical Chat
Open Source Ventilator
Blitzschnitzel:
Hi, so I saw the news that ford is making face shields:
https://www.wired.com/story/tinkerers-created-face-shield-being-used-hospitals/
Apparently, they are gluing and stapling those by hand. I made a stamping design which you can assemble in the field in seconds. And the big advantage is that you can send them flat pack with an equal number of headbands in the box. You could send these out as fast as you can stamp them. Does someone know the right contact path to get the idea to Ford? Art supplies are closed due to Corona So I can’t make a transparent version.
pipe2null:
That's a pretty effective design. :-+ Perhaps it merits its own thread to get a bit more exposure and hopefully someone will know someone? I fear my ranting today has scared away some viewers... Sorry about that.
On the UVC side of things, if I'm reading the numbers right from the study, it might be completely feasible to stick an off the shelf UVC lamp in an opaque can and pipe exhaled air through it without much need of anything else. Geometries and seals will be important, but need to figure out the UVC source first. Even if the can is 3d printed or made from chunks of PVC pipe, the plastic should probably hold up against photo degradation long enough for short term use. I haven't found any good source of info on how long it takes UVC to kill plastic. Also, from looking at other info, 254nm UV-C apparently eliminates ozone and does not actually create it (lower nm UV generates ozone). I'm currently trying to find UVC lamps that might work for an in-line virus killer for CPAP/BiPAP/etc exhaled air exhaust.
Blitzschnitzel:
Thanks. Will do. :)
jogri:
--- Quote from: pipe2null on March 31, 2020, 08:10:42 am ---On the UVC side of things, if I'm reading the numbers right from the study, it might be completely feasible to stick an off the shelf UVC lamp in an opaque can and pipe exhaled air through it without much need of anything else. Geometries and seals will be important, but need to figure out the UVC source first. Even if the can is 3d printed or made from chunks of PVC pipe, the plastic should probably hold up against photo degradation long enough for short term use. I haven't found any good source of info on how long it takes UVC to kill plastic. Also, from looking at other info, 254nm UV-C apparently eliminates ozone and does not actually create it (lower nm UV generates ozone). I'm currently trying to find UVC lamps that might work for an in-line virus killer for CPAP/BiPAP/etc exhaled air exhaust.
--- End quote ---
Let's say we have a system of two bags where each bag can contain the exhaled air of 15min ventilation (that's roughly 20l). When a bag is full the UVC source kicks in for 15min, disinfecting the contaminated air while the other bag fills up. We could either use fully collapsable bags to use their full capacity (bag gets squeezed->no remaining air) or we have to apply some sort of pressure to get the 20l of air into a container that is already filled with air at ambient pressure (having a pressurized container of airborne viruses kinda sounds like a bad idea).
A 20l cylinder (20cm diameter, 65cm height) has a surface area of 0.4m^2 (or 4000cm^2), that means we would need a 16W UVC source if we assume that the intensity for UV radiation of water samples is also viable for an aerosol (probably not). Yeah, that could work. I'd use a 50W source just to be on the safe side and some bigger containers to minimize the required pressure (a 20l canister would sit at 2bar when loaded with the 20l of residual air+ 20l of exhaled air), but it sounds feasible.
Enginerding:
Blitz and friends, would you gentleman like to join forces? I have another thread going titled "Chapter 1...." in this same forum.
Your thread proceeds mine, but I have a ~20 years medical experience. And I think that's part of what's missing here.
If you're willing to come over, I promise there will be fame, glory, land and titles.
Thank you.
https://www.eevblog.com/forum/projects/chapter-1-who-has-the-engineering-skills-to-build-a-open-source-ventilator/?all
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