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All Your Sleep Apnea Are Belong To Us
Disclaimer: Messing with CPAP settings can cause your machine to no longer function as required by your doctor, and may lead to bad things happening to the operator. Use only the settings that your doctor or sleep technician has prescribed.
I have some oddball CPAP and BiPap machines laying around and I had to reprogram one of them for a good friend of mine. While I was at it, I decided I'd like to figure out what lies in the "forbidden" area that only sleep technicians know how to get to. I'd heard from a friend who uses a CPAP that programming them usually involves unplugging it and pressing some buttons. So I started putzing around with this older model, the Respironics SleepEasy.
It's set to apply constant pressure of 6cm/H2O. Boring. There's not much that one can do with the buttons available to be pressed. They're for things like adjusting the heater attached to the humidifier reservoir, and enabling "Ramp Mode" which, from what I can tell, starts you off at a lower pressure as you try to get to sleep.
After a few minutes, I found that pressing the + and - buttons while plugging in the power did something interesting.
It's an unlock icon on the screen. Pressing + and - now adjusts the CPAP pressure in .5cm increments.
Pressing the humidifier button in this mode allows you to cycle through a few interesting diagnostics and settings. Shown below is the menu that allows the technician to completely disable the humidifier heater. Why? No idea.
I also got my hands on a more expensive and elaborate bi-level CPAP machine, the Respironics BiPap Plus M Series. These machines usually apply a higher pressure when they sense that you're inhaling, and then drop to a lower pressure while exhaling. There are more buttons and a higher-quality display on this model.
Usually, this is the screen you get in standby mode. Hitting + for "Setup" in the default user mode gives the operator very few useful options.
Holding + and - while plugging it in didn't work on this model. Next, I tried plugging it in while holding the arrow keys, and that did the trick.
Note the unlock symbol as well as a new menu option for "Data" which has a very rich array of statistics buried beneath it.
This machine hasn't been used.
Once unlocked, hitting the Setup menu button provides a lot of features, including the inhalation pressure...
And exhalation pressure.
There you have it. It seems like most Respironics machines are programmed by holding down +/- and arrow keys. These machines seem to be pretty popular. Maybe this quick walk-through will help someone who has to buy (or sell) a used machine.
Sorry I've been silent for so long. I'm still getting settled in at the new job. It's going great, and I have a great team, but there is a lot to do. Also, frankly, my brain is usually mush by the time I get home. Hopefully, I start playing with some cool and new shiny things outside of work again soon.