[PSUBS-MAILIST] latest project

[Alec Smyth via Personal_Submersibles]

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
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20200331/e2df035a/attachment.html>