Trials
Well-known member
An iron lung makes it easier for the patient to breath on their own :| nothing more, nothing less.
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Coronavirus
- Thread starter nobbie48
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I'm lost on this. If the lungs are full how do you squeeze in air even with a ventilator?
I don't think full is full. I suspect the fluid is in many of the smaller passages. Think sponge not bag of milk. I could be wrong though.
Also, if they were partly full, they wont be 100% full, so using O2 helps the remaining functional volume more effectively transfer. I'm not sure if you can get localized oxygen toxicity or just global. If you can get away with it, increasing the pressure in the lungs a bit could increase the partial pressure of 02 further to drive transfer, but I don't know if that can work. Normally, if you breathe 02 at too high a partial pressure you are facked (well your brain is anyway). I'm not sure if you can do PP 02 at 1.2 with 30% lung capacity to get you back to 0.4 which is ok or if the 1.2 will destroy your lung cells.
I don't trust any data right now due to the sketchy selection process of who gets tested and then the long delays between testing and results. Once this is over and data is plotted using onset of symptoms or test date instead of results date, it will be easier to draw conclusions.this one is interesting
anyone care to take a shot at explaining the weird curvature?
In other news. This does not necessarily mean you can catch it via contact after 17 days. Depending on your view, this could be good or bad. It sticks around, so if catchable, it's bad, if not, it's good because they might be able to "test" all passengers after they got off the ship to see who was infected (like the ship that unloaded in Sydney prior to a positive test).
www.cnbc.com
"The coronavirus RNA was found on surfaces of the Princess Cruise ship up to 17 days after passengers disembarked, new research by the CDC shows."
CDC says coronavirus RNA found in Princess Cruise ship cabins up to 17 days after passengers left
Traces of the coronavirus were found up to 17 days after passengers disembarked the Diamond Princess cruise ship, surviving far longer on surfaces than previous research has shown, according to new data published Monday by the Centers for Disease Control and Prevention.
sburns
Well-known member
We all thought you were working on it!
Trials
Well-known member
Apparently I have made more headway then most :|We all thought you were working on it!
"I'm lost on this. If the lungs are full how do you squeeze in air even with a ventilator?
It begins with an understanding of how the body draws air into the lungs.
bottom line is: if you put the persons body into a chamber with the head sticking out and you apply a vacuum to that chamber to effectively reduce the atmospheric pressure on the part of the body you breath with, well that makes it a hell of a lot easier because your mouth is still at normal atmospheric pressure outside the chamber
so no your coffin idea sucks.Oh and obviously you would like to cycle this vacuum at the same rate as their normal breathing, you don't want to make it one big last breath.
An important question is how much pressure is required to ventilate a patient with ARDS? If it is a lot, your iron lung could potential suck the *&^*& right out of them. With pressure changing so quickly, the rest of your systems that contain gas don't have time to equilize. Come to think of it, if you really had to suck hard, could your box give someone the bends? Quite possibly. Again, I have no idea whether a ventilator being used for ARDS operates at 0.01 psi, 0.1 psi, 1 psi or 10 psi. Obviously old school iron lungs were <<1 psi or you wouldn't be able to move that bellows.Apparently I have made more headway then most :|
"I'm lost on this. If the lungs are full how do you squeeze in air even with a ventilator?
It begins with an understanding of how the body draws air into the lungs.
bottom line is: if you put the persons body into a chamber with the head sticking out and you apply a vacuum to that chamber to effectively reduce the atmospheric pressure on the part of the body you breath with, well that makes it a hell of a lot easier because your mouth is still at normal atmospheric pressure outside the chamber
Oh and obviously you would like to cycle this vacuum at the same rate as their normal breathing, you don't want to make it one big last breath.
Trials
Well-known member
If you are building it at home you are going to be lucky to do much different or better then a vintage one. I don't think the patient will implode from a moving bellows. lol so no we are not going to put the patient in a 14 foot culvert and have a 9 foot piston stroke and their neck totally sealed in :|
They also may not get sufficient ventilation if the pressure differential is not enough. As others have said, iron lungs were primarily for paralysis so you had healthy lungs with no useful diaphragm. Unhealthy lungs change things some.
Trials
Well-known member
Correct but they can't help but get improved ventilation.
Look in old pictures, all those patients are not paralyzed.
looks like the torque curve on my RD350
but seriously, hope we can flatten the thing that's going vertical
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Live statistics and coronavirus news tracking the number of confirmed cases, recovered patients, tests, and death toll due to the COVID-19 coronavirus from Wuhan, China. Coronavirus counter with new cases, deaths, and number of tests per 1 Million population. Historical data and info. Daily...www.worldometers.info
Torque curve on a RD is almost flat.
J_F
Guest
bad chart
torque on that goes dead vertical from 0 to 4500 RPM
and it's strange the way it's drawn
why is 0 to 4500 all bunched up like that?
an non-YPVS RD does not come on the pipe until around 7
then you have a band of 1000 RPM fighting to keep the front tire down
I know what that looks like on a chart
it ain't flat my brother
torque on that goes dead vertical from 0 to 4500 RPM
and it's strange the way it's drawn
why is 0 to 4500 all bunched up like that?
an non-YPVS RD does not come on the pipe until around 7
then you have a band of 1000 RPM fighting to keep the front tire down
I know what that looks like on a chart
it ain't flat my brother
J_F
Guest
X = RPM
Y = power, it's German so can't tell what the unit is, assuming it's NM and not HP
the X axis has unusual spacing, as I stated, maybe because as Trials said, it's specific to the dyno
and my original statement indicates I was talking about my RD350
it had porting work, aftermarket expansion chambers and jetting to make it run properly
it did not have a flat torque curve?
Y = power, it's German so can't tell what the unit is, assuming it's NM and not HP
the X axis has unusual spacing, as I stated, maybe because as Trials said, it's specific to the dyno
and my original statement indicates I was talking about my RD350
it had porting work, aftermarket expansion chambers and jetting to make it run properly
it did not have a flat torque curve?
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