[PSUBS-MAILIST] latest project

Tue Mar 31 13:38:19 EDT 2020

Alec,

This is an interesting project.  You likely noticed that a common addition to iron lungs is a mirror attached above the patient's head and tilted at a 45 degree angle.  This allows visitors to talk horizontally to the patient who is lying on his back. Just an added touch you may find useful. 

As well, perhaps an iron lung built to allow sitting upright would be interesting. Such a design would certainly make eating and as well as interacting with visitors easier.  You could even have the patient sitting on a porta-potty for obvious reasons.  Appended is an interesting portable/wearable version that would be a good project too.

Stay well, everyone.

Tim

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of James Frankland via Personal_Submersibles
Sent: Tuesday, March 31, 2020 5:42 AM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] latest project

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 <mailto: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 <mailto: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 <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> &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 <mailto: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 <mailto: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> https://youtu.be/YhcHLfxDFnU  

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org <mailto:Personal_Submersibles at psubs.org> 
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org <mailto:Personal_Submersibles at psubs.org> 
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org <mailto: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/cc74678f/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 567944 bytes
Desc: not available
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20200331/cc74678f/attachment-0001.png>