[PSUBS-MAILIST] latest project

Tue Mar 31 08:29:50 EDT 2020

 Alec, fantastic! Hank
    On Tuesday, March 31, 2020, 6:22:24 AM MDT, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hi Sean,
Timing is supposed to be between 12 and 40 breaths per minute. I have it at 19, and my method for altering the tempo is to change the kart gear ratio (the valve the sprocket is bolted to slides to adjust chain tension). I also have a much more powerful vac that I haven't tested yet - the little one feels just about right but its a test I'm planning to do. One method I saw they used for setting pressure was by putting in over-pressure valves, one in each direction, which could be adjusted with a thumb screw. Interestingly, they were the same exact design we use on our subs. But that refinement is a nice to have. There are many things I could do to improve this, and one of the first would be to install a speed control on the gear-motor so I could just adjust tempo with a knob. But the priority was just to make something that works, fast.
Not sure if you all saw them, but the video has some good links in the description. I'll paste them here. One of them is a paper whereby iron lungs were found to be more effective than positive pressure ventilators. But of course, nobody likes the bulk, weight, and noise. If I were the patient, though, I think I wouldn't mind. 
https://books.google.com/books?id=giQDAAAAMBAJ&pg=PA130&lpg=PA130&dq=iron+lung+valves&source=bl&ots=Nw4qVthoiF&sig=ACfU3U1Vg5FaFAM4aepRhde5vkSMC7m0CA&hl=en&sa=X&ved=2ahUKEwj01K2X2a7oAhVYgnIEHfUoCDEQ6AEwF3oECA4QAQ#v=onepage&q=iron%20lung%20valves&f=false 
 http://blog.modernmechanix.com/diy-iron-lung/

https://www.ncbi.nlm.nih.gov/pubmed/22386062  

Best,
Alec
On Tue, Mar 31, 2020 at 12:15 AM Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

An iron lung built from wood. Ha.

Cool project, though perhaps not entirely practical.

I might suggest locating the vacuum more remotely to cut down on the noise, adding a diverter / venturi to selectively draw some room air to reduce the vacuum pressure (make it variable), and if you were to actually treat someone with this, have some means of providing supplemental continuous flow oxygen via mask or cannula. You might also consider adding a window so you can monitor chest rise. What is the timing? Six seconds in, four out?

Very Frankenstein-ish, but it could certainly save a life in the absence of hospital availability. 

Sean

-------- Original Message --------
On Mar. 30, 2020, 21:55, Alec Smyth via Personal_Submersibles < personal_submersibles at psubs.org> wrote:

OK, this one was a bit different. But I did choose a proper color for it. 
Best,
Alec

https://youtu.be/YhcHLfxDFnU  
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