[chbot] Chchrobotics Digest, Vol 150, Issue 32

[Charles Manning]

I think we can assume there is sufficient O2 being made by LiquidGas etc
for the foreseeable future.
Adding electrolysis is an added complication and trying to make enough for
hundred of ventilators would be a massive (and I think distracting)
challenge. Venting that volume of H2 sounds like trouble...

I had a look around the MIT design. Looks pretty simple. Basically a
reduction motor that squeezes an ambu bag(BMV). Do those things have a long
lifetime? That design could basically be taken as is and put into low-tech
manufacturing. It is based mainly on off the shelf kit (Arduio UNO, motor
controller, pots, sensors, reduction motors) and uses a PSU power supply.

I saw another design using pneumatic solenoids to do the switching of gas
flow. Probably more durable etc, but less developed than the MIT design.

There does not just have to be one design, IMHO. Two or three designs would
mean that if one design fails there is still another to fall back on, but
too many does dilute efforts.

It seems to me that the basic MIT electronics could be readily adapted to
drive air solenoids rather than an ambu bag, allowing an easy fork in the
design if that made sense.


On Mon, Mar 30, 2020 at 3:39 PM Bevin Brett <bevin_brett at hotmail.com> wrote:

>
>
> As a USA paramedic, (NZ intensive care paramedic equivalent) I can answer
> some of this
>
>
>
>    1. “John While that sounds interesting, I am somewhat confused as to
>    how to how electrolysis hydrogen and oxygen fit in with mechanical
>    ventilation.”
>
>    Most ventilated patients require air with more than 22% O2 because the
>    inner surfaces of the lung are damaged.
>
>
>
> The O2 must be mixed in the right proportions with the air being pushed in
> by the ventilator
>
>
>        2) Spencer and Volker are right, look at
>
>
>
>
> https://www.medgadget.com/2020/03/mit-emergency-ventilator-submitted-for-fda-review.html
>
>
>
> for an existing design, and at
>
>
>
>
> https://www.agorize.com/en/challenges/code-life-challenge/pages/guidelines?lang=en
>
>
>
> for the requirements.    This second (the Agorize challenge) is the
> Montreal/McGill effort and they will have their open source proposal in a
> week or two
>
> I really like the MIT one – I had the same idea myself during a sleepless
> night -  and there is also one team in the Montreal challenge that proposed
> it also (why I didn’t take my night thoughts further)
>
> So – my advice – adapt the MIT design for what is available off the shelf
> here
>
>
>
>
>
>
> _______________________________________________
> Chchrobotics mailing list Chchrobotics at lists.ourshack.com
> https://lists.ourshack.com/mailman/listinfo/chchrobotics
> Mail Archives: http://lists.ourshack.com/pipermail/chchrobotics/
> Meetings usually 3rd Monday each month. See http://kiwibots.org for
> venue, directions and dates.
> When replying, please edit your Subject line to reflect new subjects.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ourshack.com/pipermail/chchrobotics/attachments/20200330/58d832c6/attachment.html>