h a l f b a k e r y"Look on my works, ye Mighty, and despair!"
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Airstraws
Masks being in low supply, just use nasal tubes and connect to air filters of various kinds that are not in low supply. | |
Nasal cannulae had long been used for delivery of supplementary oxygen.
However, making them airtight, with a slightly larger diameter, would make
them
usable for breathing air from where it's clean. For example, the air in
someone's bag, or a filter hung on the neck like a neckless.
Then,
design the connectors with all kind of existing air filters. This may be
interesting for tube manufacturers, and the manufacturers of existing HEPA
filters
of various different form factors, for which the connectors could be designed,
and
this way, new demand for their production created.
CPAP masks
https://www.cheapcp...sks-quieter-others/
This one most similar. The hypothesis of Airstraws is that these could be used without positive pressure pump, and easily mass-produced. [Inyuki, Apr 01 2020]
[link]
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You need positive pressure for cannulae to function properly, so you'll need a pump. |
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Well, that depends on the diameters of the tubing... So, this would come in
two
versions -- large diameter for manual breathing (ugly, but cheaper), and
small diameter, with
a positive pressure battery-powered pump. |
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If the tubing is big enough to seal tightly it will be very uncomfortable. Such designs were investigated during WW1 for respirators, and rejected in favour of a nose clip and mouthpiece; it would have made issuing orders much easier if breathing through the nose. |
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// Such designs were investigated during WW1 for respirators, and
rejected in favour of a nose clip and mouthpiece |
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Perhaps they should be reassessed with new soft and adaptive
materials of the 21st century. Cannulae shoud be larger than 1 cm in
diameter to fit tightly to the nostrils. |
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// would have made issuing orders much easier if breathing through the
nose |
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// to fit tightly to the nostrils // |
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Hence the problem. Anything that fits tightly, no matter what its conformal characteristics, rapidly becomes uncomfortable, and the skin inside the nostrils is not adapted to contact, unlike the lips. While sensetive, the lips are well adapted to cope with pressure and mild abrasion. |
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The military of many nations have repeatedly investigated this as it offers a solution to a major problem. They're still investigating. They're still getting nowhere without positive pressure systems. The cannula not only needs to seal; it needs to seal absolutely reliably under negative pressure. Anything less than that is useless. |
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Fair enough. But think of this -- drill two holes in a tube, and wrap the tube
around the head below the nose, above the ears, connecting at the back
of the head. Perhaps the holes
can simply be at the surface of the bottom of the nose, without having to
have any tubes getting inside the nostrils. As long as the tensile pressure
holds the tube surface at the nose surface, the contact is air-tight. |
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You're describing a CPAP mask (Baked and WKTE) and they need positive pressure, though for different reasons. |
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But unless you protect the mouth too, inhaling pathogens is inevitable. |
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Well, if I Google for CPAP masks, most designs are with much more
complex way of securing the tube to nose. I found most similar one, and
linked, which actually, does look like what I am proposing here, due to
the
simplicity -- cutting tubes, and securing on the head. |
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The hypothesis is that the tubes can be sufficiently large to not require
positive pressure pump, making this easier to mass produce. |
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// But unless you protect the mouth too, inhaling pathogens is
inevitable. |
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Most humans are able to close mouth voluntarily, which we would
expect, or, otherwise, a pacifier would be required. |
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[Chairborne Hero], I'd give a bun for this observation so in the context of
COVID-19 -- preventing others dispersing their sneezed of coughed
material must be
playing much greater role in the spread of COVID-19, and this idea is
not a solution to that. |
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Although it would prevent from inhaling those droplets, which is one of the
pathways for the infection. |
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To be fair, Covid is not mentioned anywhere in the original idea, [CH]. |
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And given the author, a lack of understanding of the fundamental issues is a given. |
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A bone seems a little unfair ... |
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// Bone for a fundamental misunderstanding of why masks might be
advisable for the anyone outside of medical profession. |
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We've talked about "Hand Sanitizer With Irritant Added" idea... It's not
that. It's just thinking of the supply of masks, and what could replace them,
well, not entirely, which I have to agree with. |
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// Now I *know* it's April 1! // |
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Well spotted. Normal service will be resumed at midnight. |
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Actually, not quite normal, as all the bile, venom and general snarkiness we would have dispensed today has been stored up and will be released in a surge of gratuitous unpleasantness as soon as practicable. |
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// For all of the reasons you have already and competently pointed out. // |
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... which begs the question why you thought you needed to comment at all. |
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Which brings me back to the "pacifier" idea... |
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For [CH] ? Yes, of course. That, and a bib to catch the dribble ... |
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What with those, and the ... adult incontinence garments ... and the hearing aids, and the spectacles, he's getting more and more Borg-like every day. |
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But not in a good way <Sniggering/> |
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Problem is that, now that we understand CHairborne transmission,
lengthening the incubation period and upping the mortality rates could be
rather trivial, and my worst nightmares are just a step away. |
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<Taps [Inyuki] on shoulder/> |
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