COVID 19 / Coronavirus Ambu Bag Alternative challenges, 3D printed Pump Valves, PEEP valve revisions

CHECK THIS OUT IF YOU WANT TO HELP: hackaday.com/2020/03/12/ultim...
#Projectopenair: www.projectopenair.org/
also the facebook group here: / 67093. .
In this video I go through a few different things related to my project.
FIRST: TO BE CLEAR: These designs ARE NOT replacement parts for the ventilators in hospitals right now. DO NOT print them out and bring them to a hospital. These are component precursors to open source, and crowdsourced DIY ventilators that people are working on all over the world. DO grab the CAD files and use them in your designs. I hope to 1: speed up people designing larger systems, by designing components that they can just grab and use, rather than redesign them from scratch, or wait for off the shelf parts. Amazon just shut down incoming warehouse deliveries of many items, I would assume plumbing valves are on that list. And 2, which is related to some limited e-commerce right now: I hope to make some alternative designs for already used components, so that they can be used in place of off the shelf components if and when they run out, or if shipping and lead times get very long.
You can download, or copy and modify the parts to the pump head valve body in this video here: cad.onshape.com/documents/5c9...
make a free onshape account and you should be able to easily modify some of the dimensions of this set of parts for use in your own project.
Printing instructions:
All prints at 0.4mm nozzle, 0.3mm layer height, in PLA, but PETG is better. No support material is needed for any of the parts.
print the lock nut nut at 30% infill, 4 shell layers all around, top and bottom
Print the other parts at 10-15% infill, 4 shell layers all around. If you can, turn on the option in your slicer for "Avoid Crossing Periiters"
Print the check valves with the orifice plates flat against a CLEAN GLASS print bed. these need to be smooth. print the exhaust (labeled 'out fitting') with the hose barb nozzle against the print bed, and the large threaded part of the funnel facing up. This is counterintuitive, but it works better this way.
Thanks for reading and watching. I hope that someone figures out a good solution for the rest of an Ambu Bag replacement. If you have some thoughts on it, please drop them in the comments, I'll try and test some out and get a working prototype and share it back with the group.
Stay safe, and have fun building!

[@danielreid5524]

And I am loving your videos keep up the hard work. I have a feeling us makers at home are going to be needed badly soon.

[@amanmidha05]

You may try an accordion like corrugated bellow or simply make one out of a sheet of plastic which has a frame to it and a motor with a spring to open and close the bellow

[@eenkjet]

Go to a walmart and check out the giant syringe swimming pool water guns for the pneumatic design.

[@CAMERADACTYLCameras]

It occurred to me. off season in my local walmart. may come to that on amzon. I've got some 3D printed pumps on the printers now. There's some things that I dont like about them, but I think they'll work. If they do, I'll get them up later tonight

[@sumgai7]

@@CAMERADACTYLCameras Looking forward to seeing those! What's the design type/source for the pumps?

[@dmbworks8094]

interesting, certainly gets one thinking. i don't have a 3d printer but i do have a couple cnc machines.

[@sumgai7]

CONSTRUCTION NOTES/THOUGHTS (I built one): so I finally got all the parts printed out and have a few learnin's to share. The threads don't seal well (I know they're not really expected to on their own!, but the thread profile could be improved btw; the knife-edges are a bit of a problem), and I found that using 2 wraps of /yellow/ teflon tape worked great. (Note: yellow is thicker and intended for gas; the white is more intended for liquids applications). I also think there might be a /very tiny/ bit of leakage actually /through/ the material - (I used PLA; would probably go to PET-G for 'production' model) - barely detectable if it's there at all, but might happen more to someone else, so make sure your settings are good: number of shells/walls, top/bottom layers, and make sure you're getting good layer/layer adhesion. I'd also recommend a small washer under the M3 screw head, preferably something compressible/rubbery, to keep the valve seal material from tearing /and/ to prevent leakage there. And finally, make sure your valve seal discs are -not- all the way to the edge (i.e. make them slightly smaller in diameter) -- if they go all the way to the edge or stick out at all, the material can get twisted by the threads during assembly and pucker the material or even trapped down and prevented from opening. Big suggestion to Joe as mentioned above - a better thread profile would be good for a couple of reasons (dunno if OnShape has a library of threads or a tool...?) NICE job - can't wait to see more updates. (And I joined the project, slack group, etc., and doing a lot of research and building/tweaking on my end - will share relevant compatible stuff that'd go with this if/as I find it...)

[@DeonBands]

This is interesting. I see how your project is progressing. I was wondering if you look at using plastic cheap kiddie soccer balls, with a fitting. They tend to return to their shape once compressed.

[@richreynolds9835]

This is great! I too have been working on a DIY ventilator(trying to use very readily available materials), would love to connect and see what we can come up with together.

[@leonardbauer82]

Check out scuba regulator seating system at scuba tools.com for pump. Also look at using diaphragms form regulators or snorkels for your membranes. All this stuff already exists, and would be easy to incorporate in your designinging

[@nonya2445]

I haven't heard back. Can you tell me the internal thread specs on the locknut? What is the ID and thread count and any other specs.

[@AdricM]

What about going for a much larger bottle size. perhaps a 2 or 3 litre or even gallon jug size. also perhaps increasing the density of the water may help. epson salts are common and pretty safe, and i know you can up the apparent density of water with them.

[@mytubehkjt]

What about using running water instead of a squeeze bag. Kind of like a self flushing toilet cistern. If you tuned it correctly you could get variable flow/ timing and volume. No leaks and no electricity required.

[@sadface7457]

The water level is the piston and you could a pathogen cup for the emptying, self-flushing mechanism. kzbin.info/www/bejne/qZq2qmWfrbpjpZI

[@mdshakir91]

small blower with controlled valve ..can b used as a bipap and capap. i have some ideas .

[@chandlerchen6864]

Great idea with the bottle! How about a 2 litre pop bottle since people drink so much of it?

[@danielreid5524]

Have you seen the Go2vent? I'm looking around now to see if anyone has tried to 3d print it yet, but im not having any luck.

[@stevensmith1852]

How about just focusing on the the valving and pressure requirements? While there is some risk to using an oil free air compressor as the main pump a single compressor could probably supply air to many patient. the Primary regulator could be a high quality commercial unit as only one will be required per compressor.

[@wbheightfive6760]

it may not be ideal but what if it fit inside a 4 inch pvc pipe x 1 meter...maybe attach multiples to an exercise bike fly wheel exercise bikes and 4 inch pipe are already widely available kind of a watt steam engine kind of thing

[@paurichennessy1798]

Hi there , wondering if a BPM cuff could be wrapped around an ambu bag and inflate the cuff to perform inhale and deflate the cuff for exhale . Is there any reason why this would not work . It would mean we would need a stronger pump for inflating the cuff , but other than that it would be simple to setup with some elctroinics and some valves ?

[@nonya2445]

What is the internal thread size on the locknut?

[@freddyaulia2157]

What about use pedal inflatable pump?

[@freddyaulia2157]

Balloons Type Pedal Inflatable Pump Tools Air Pump Manual Practical - Specta88 | Tokopedia

[@wolfgangs8146]

Hi. I used both of your valves and they work great. Thanks for these fantastic designs. You can find my own machine is under worldwidewolf.de/vent.html

[@ajayborate1578]

Can I get STL. FILE DIRECTLY

[@nhanvothanh9433]

Can you share for me? Because Vietnam many people death Covid

[@mandymccleary9197]

What about a bike pump?

[@CAMERADACTYLCameras]

It could be retrofitted. it's high pressure low volume though, which is generally a bit dangerous in this type of machine. maybe an air mattress pump sort of device. I am thinking about putting rigid rings onto a ziploc bag and enclosing it inside a bottle, pushing from one end. Maybe after that, I'll do a mechanically actuated cutoff valve, and then work on a bipap type machine that uses an air mattress electric motor and an arduino controller, but maybe there are better projects out there before I go that far. I want to add useful things to the projects, not reinvent any. I need to stop after a few more and do some more reading into the current state of things.

[@zinoxleo]

​@@CAMERADACTYLCameras I think that is a good idea! -This kind of material would be ideal (www.cdiscount.com/pdt2/4/7/6/1/700x700/dia3664100157476/rw/10-m-de-tuyau-flexible-d-aspiration-bois-d-150-mm.jpg) but for sure you can't find it everywhere. -If you try to do it yourself with the ziplocbag, try instead of rigid rings, a "spring setup". It wil move to the original position by itself, just like the tube on the link above.

[@zinoxleo]

Also img3.bgxcdn.com/thumb/view/oaupload/banggood/images/ED/BD/99de6c80-2ac7-4df5-b76a-19a6fc0efa2a.jpg

[@sumgai7]

@@zinoxleo There's a ventilator design (really crude looking but a clever start) with a bellows bag on Instructables - www.instructables.com/id/The-Pandemic-Ventilator/

[@AdricM]

more likely something more like a Raft pump or airbed pump may be a better solution, lots of those blow on both the push and pull stroke.