[PSUBS-MAILIST] latest project

[James Frankland via Personal_Submersibles]

Alec,

Looks like your stuck at home with nothing much to do!  But great effort.
Better that than nothing in an emergency.

On Tue, 31 Mar 2020 at 13:30, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> 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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