Auto Algorithm Priority

TangledHose · Post by **TangledHose** » Tue Feb 03, 2015 12:04 pm

I was doing a search on the forum to educate myself on how APAP comes up with a Baseline for Flow Limitations. In the process I stumbled across an old thread from 2008, a discussion of Flow Limitations and Variable Breathing between user dsm and Sleeprider. User dsm posted a lot of information from a Resperonics Patent, and in that document was a section on the Auto PAP Algorithm and what has priority in changing pressures. I just found this information enlightening and thought I'd re-post a small section here so that the newer members on the board can gain some insight as to how an APAP responds to events.

To summarize the Algorithm priority goes like this (highest priority to lowest)

1) Flow Limit control layer
2) Snore control layer
3) Big Leak control layer
4) Apnea/Hypopnea control layer
5)Variable Breathing control layer
6) Auto-CPAP control layer

from user "dsm" (2008) .....excerpt from Resperonics Patent:

"The system of claim 3, wherein: (1) the flow limit control layer has a higher priority than the snore control layer, the big leak control layer, the apnea/hypopnea control layer, the variable breathing control layer, and the auto-CPAP control layer; (2) the snore control layer has a higher priority than the big leak control layer, the apnea/hypopnea control layer, the variable breathing control layer, and the auto-CPAP control layer and has a lower priority than the flow limit control layer; (3) the big leak control layer has a higher priority than the apnea/hypopnea control layer, the variable breathing control layer, and the auto-CPAP control layer and has a lower priority than the flow limit control layer and the snore control layer; (4) the apnea/hypopnea control layer has a higher priority than the variable breathing control layer, and the auto-CPAP control layer and has a lower priority than the flow limit control layer, the snore control layer, and the big leak control layer; and (5) the variable breathing control layer has a higher priority than the auto-CPAP control layer and has a lower priority than the flow limit control layer, the snore control layer, the big leak control layer, and the apnea/hypopnea control layer."

Sleeprider · Post by **Sleeprider** » Tue Feb 03, 2015 12:29 pm

Pretty neat stuff, and nice to see an old topic brought back up. I wonder how much has changed. At that time, we were using M-Series auto machines and I think the Aflex algorithm was just added. It appears that that patent claim goes back to 2004 and some very early APAP machines. The same language continues to appear in updated patent language issued in 2010 paragraph 4 of the issued patent is identical:

4. The system of claim 3, wherein: (1) the flow limit control layer has a higher priority than the snore control layer, the big leak control layer, the apnea/hypopnea control layer, the variable breathing control layer, and the auto-CPAPcontrol layer; (2) the snore control layer has a higher priority than the big leak control layer, the apnea/hypopnea control layer, the variable breathing control layer, and the auto-CPAP control layer and has a lower priority than the flow limitcontrol layer; (3) the big leak control layer has a higher priority than the apnea/hypopnea control layer, the variable breathing control layer, and the auto-CPAP control layer and has a lower priority than the flow limit control layer and the snorecontrol layer; (4) the apnea/hypopnea control layer has a higher priority than the variable breathing control layer, and the auto-CPAP control layer and has a lower priority than the flow limit control layer, the snore control layer, and the big leakcontrol layer; and (5) the variable breathing control layer has a higher priority than the auto-CPAP control layer and has a lower priority than the flow limit control layer, the snore control layer, the big leak control layer, and the apnea/hypopneacontrol layer.

I have no idea what the most recent patent would be, or why I would have been involved in a discussion of it in 2008.

BTW all of the authors live very close to where I am in Murrysville, PA.

TangledHose · Post by **TangledHose** » Tue Feb 03, 2015 12:55 pm

it's just a guess on my part, but I would suspect there would be very little change to the priorities order in that list over the last few years. I think they would probably still be the same as far as that goes.

It's my understanding that the patent was Resperonics................would be interesting to compare to the ResMed Algorithm, but again I would guess they are the same for the most part.

It's amazing some of the stuff one can find when you go poking around in these older posts!

Auto Algorithm Priority

Auto Algorithm Priority

Re: Auto Algorithm Priority

Re: Auto Algorithm Priority