Comfort Curve fix for 420E

WillSucceed · Post by **WillSucceed** » Fri Apr 22, 2005 10:00 am

I posted this in the Comfort Curve thread but wanted it to get seen, so I'm copying it here.

I think there might be a fix for the 420E users:

Quote:
It appears that this interface will not work with the 420E. It only works with a special hose that they provide, so there is no small diameter pressure tubing line for the flow sensor.

The sensor tube inside of the 420E hose is nothing more than plastic tubing that you can buy at Home Depot -->same size, same everything.

So, one could purchase around 7 feet of this small diameter tubing from Home Depot.
Drill a small hole in the side of the Comfort Curve tube down near the end where it attaches to the flow generator and feed the small tube through, leaving about 4 inches of small tube hanging out (like the 420E tube) AND, having the other end of the small tube ending up in the "Y" connection of the Comfort Curve hose.
Create a seal around the hole where the small tube dangles out with some silicone caulking.

In essence, build a 420E compatible hose out of the hose that comes with the Comfort Curve simply by adding a pressure line. Plug the sensor tube and the main tube into the appropriate holes on the 420E and voila!

What do you all think? Possible?

meister · Post by **meister** » Fri Apr 22, 2005 11:59 am

Let us know how it goes? You could be the world-wide
distributer for this special "WillSuceed" Hose, and make
a million!!

WillSucceed · Post by **WillSucceed** » Fri Apr 22, 2005 12:40 pm

make
a million!!

Ya, I wish...

WillSucceed · Post by **WillSucceed** » Fri Apr 22, 2005 12:42 pm

Before I attempt this, I'll be waiting to see what the reviews are like on the Comfort Curve.

-SWS · Post by **-SWS** » Fri Apr 22, 2005 10:19 pm

Two possible caveats relating to airflow. If an introduced edge inadvertently produced adequate resonance, then snore can be misdetected by the 420e. Alternately (or in addition to) if an introduced edge or even surface produced adequate turbulance, then subtle flow limitation wave shape recognition can be skewed.

You can carefully baseline your snore, flow limitation, and even hypopnea statistics before and after the modification to ensure that you have introduced no spurious airflow signals.

Guest · Post by **Guest** » Sat Apr 23, 2005 5:30 am

Sounds like a lot of heated humidified spurious airflow to me.

-SWS · Post by **-SWS** » Sat Apr 23, 2005 10:42 am

Regarding "edge" and resonance, guest: that is precisely how woodwind instruments generate their noise. The 420e detects snore by looking for acoustical vibrations.

Regarding turbulence: the 420e attempts to recognize whether flow limitation has occurred by looking for highly subtle wave shape factors. Specifically, the 420e looks for these wave shape factors to determine the occurence of flow limitation: 1) sinusoidal index, 2) flatness index, 3) respiratory effort index and 4) relative flow magnitude index. The flatness index in particular is weighted very heavily and would be at risk from any subtle airflow turbulence that happened to be introduced. Recall that the 420e flow limitation detection criteria is not as straight forward and simple as hypopnea's straight forward amplitude reduction criteria. Rather the 420e pattern-detects wave shape subtleties then plays a sheer game of probability based on those four wave shape indices in determining whether flow limitation has occurred. Regarding overall sleep event determination, this wave shape detection process in particular is the achilles heal of the 420e. Recall how many have had to turn off IFL1 because of over triggering.

And yes, any flatness skewing turbulence or edged-generated resonance could very well entail heated and humidified air.

LDuyer · Post by **LDuyer** » Sat Apr 23, 2005 11:24 am

-SWS wrote:Two possible caveats .....

Caveat --- yet another word I haven't used often. Hmmm. Perhaps I should use it more often. How can I use this in a sentence?
I nead a caveat to explain all the screwups in my life.
Hmm. That would be one big caveat...!

Challenge me, SWS. I need more words to look up.
(This one I sort of knew, but never used it.)

ca·ve·at
Pronunciation: 'ka-vE-"ät, -"at; 'kä-vE-"ät; 'kA-vE-"at
Function: noun
Etymology: Latin, let him beware, from cavEre -- more at HEAR
1 a : a warning enjoining one from certain acts or practices b : an explanation to prevent misinterpretation c : a modifying or cautionary detail to be considered when evaluating, interpreting, or doing something
2 : a legal warning to a judicial officer to suspend a proceeding until the opposition has a hearing

-SWS · Post by **-SWS** » Sat Apr 23, 2005 11:32 am

The farmer asked his Swedish neigbor where his prized pet calf happened to be.

The Swedish neighbor responded: "Cav.... e at the veal factory. My wife wants a pet rabbit instead."

LDuyer · Post by **LDuyer** » Sat Apr 23, 2005 11:40 am

SWS ---

You nut!
You're funny.
(figures you'd provide an animal joke, you nature lover you!)

You make me smile!

Linda

rested gal · Post by **rested gal** » Sat Apr 23, 2005 12:58 pm

Another pet caveat for ya, Linda:

"Beware of the dog".

For apneic mask shoppers, a good caveat might be:
"Buyer beware."

I like SWS's Swedish caveat the best, though!

-SWS · Post by **-SWS** » Sat Apr 23, 2005 1:01 pm

Rested Gal wrote:I like SWS's Swedish caveat...

Thanks, Rested Gal. I might have to title that one: "Caveat Down at the Veal Factory".

I'm also headed down to the pet store to trade in my pet peeve for a more sophisticated pet caveat!

LDuyer · Post by **LDuyer** » Sat Apr 23, 2005 1:18 pm

rested gal wrote: I like SWS's Swedish caveat the best, though!

Yep, SWS definitely is King Caveat.

L.

meister · Post by **meister** » Sat Apr 23, 2005 6:30 pm

SWS is sedulous and Linda is a tyro, if not quixotic.
I find Rested Gal's post to be erudite, if not even sagacious.

See what a college degree will do for you?

Comfort Curve fix for 420E

Comfort Curve fix for 420E

Don't sit there, man! Get down to Home Depot now!!

420E fix

420E

Words, words, words