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How Does CPAP Machine Work?
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BobF Offline

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Posts: 74
Joined: Aug 2012

Machine: ResMed S9 Elite
Mask Type: Full face mask
Mask Make & Model: Respironics Blue Gel Full Face Large
Humidifier: H5i
CPAP Pressure: 12
CPAP Software: ResScan

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Sex: Male
Location:

Post: #1
How Does CPAP Machine Work?
I am really curious how the CPAP machines work internally. I have a ResMed S9 Elite. I have looked on the Internet and could not find any info. Thanks, Bob.
10-22-2012 06:14 PM
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PaulaO2 Offline
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Posts: 7,181
Joined: Feb 2012

Machine: S9 Autoset
Mask Type: Full face mask
Mask Make & Model: Simplus and Nuance
Humidifier: H5i
CPAP Pressure: 14-20
CPAP Software: SleepyHead

Other Comments: Ehlers-Danlos Syndrome, Hypermobility Type; chronic sarcasm

Sex: Undisclosed
Location: western NC, USA

Post: #2
RE: How Does CPAP Machine Work?
If you want to have fun, buy an old used one from Craigslist and take it apart.

Inside are probably 1 - 2 boards with electronics. One will have the firmware that keeps track of everything. Then there'd be the air pump itself.

PaulaO2
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Breathe deeply and count to zen.

INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
10-22-2012 06:35 PM
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BobF Offline

Preferred Members-2

Posts: 74
Joined: Aug 2012

Machine: ResMed S9 Elite
Mask Type: Full face mask
Mask Make & Model: Respironics Blue Gel Full Face Large
Humidifier: H5i
CPAP Pressure: 12
CPAP Software: ResScan

Other Comments:

Sex: Male
Location:

Post: #3
RE: How Does CPAP Machine Work?
Thanks. I am not that interested in paying for one. I was hoping someone could describe what was inside or find a website with detailed information. Regards, Bob.
10-22-2012 07:08 PM
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zonk Offline

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Posts: 7,215
Joined: Feb 2012

Machine: A10 AutoSet
Mask Type: Nasal mask
Mask Make & Model: Activa LT
Humidifier: H2O
CPAP Pressure: 9.4/12.4 - EPR: Off
CPAP Software: ResScan

Other Comments: CPAP since Nov 2010

Sex: Male
Location: Australia

Post: #4
RE: How Does CPAP Machine Work?
there are some pictures here
http://www.apneaboard.com/forums/Thread-...AP-machine
http://www.apneaboard.com/forums/Thread-Bored-with-old-CPAP
10-22-2012 07:34 PM
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SuperSleeper Offline

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Posts: 10,315
Joined: Feb 2012

Machine: ResMed S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed Mirage Swift II
Humidifier: none
CPAP Pressure: 12.6 - 18 cmH20 (auto range)
CPAP Software: SleepyHead

Other Comments: Have diabetes Type II

Sex: Male
Location: Dixon, Illinois, USA

Post: #5
RE: How Does CPAP Machine Work?
CPAP machines are basically reversed vacuum cleaners. I'm pretty sure that the first one made by Dr. Sullivan was exactly that: a vacuum cleaner that was tinkered with.

Generally the same concepts apply. The difference is that CPAP machines have better parts than vacuum cleaners, plus some technology to control the flow rate and a few other handy adjustments.

That's the extent of my internal CPAP wisdom. Sorry... it ain't much. Bigwink

Truth is that CPAP manufacturers are pretty secretive concerning their equipment, especially the firmware and algorithms that they use. You're not going to find anywhere out on the Net where the proprietary insides of CPAP machines are revealed and explained in detail.

SuperSleeper
Apnea Board Administrator
www.ApneaBoard.com


INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.

10-22-2012 10:21 PM
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PaulaO2 Offline
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Moderators

Posts: 7,181
Joined: Feb 2012

Machine: S9 Autoset
Mask Type: Full face mask
Mask Make & Model: Simplus and Nuance
Humidifier: H5i
CPAP Pressure: 14-20
CPAP Software: SleepyHead

Other Comments: Ehlers-Danlos Syndrome, Hypermobility Type; chronic sarcasm

Sex: Undisclosed
Location: western NC, USA

Post: #6
RE: How Does CPAP Machine Work?
Prettified leaf blower!

PaulaO2
Apnea Board Moderator
www.ApneaBoard.com


Breathe deeply and count to zen.

INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
10-22-2012 10:30 PM
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genes Offline

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Posts: 60
Joined: Sep 2012

Machine: Respronics Auto Cpap
Mask Type: Nasal mask
Mask Make & Model:
Humidifier: Respronics
CPAP Pressure: 17 -20
CPAP Software: EncorePro

Other Comments:

Sex: Male
Location:

Post: #7
RE: How Does CPAP Machine Work?
Bob
I will try to add a little bit to the discussion. This is more more how I think it works than information from cpap suppliers etc. so feel free to comment.
Where I live atmospheric pressure is about 14.7 lb/sq in. This is equal to the pressure exerted by a column of water about 33.9 feet or about 1035 centimeters high. Cpap pressure is measured in gage or relative pressure which is how much higher or lower the pressure is compared to atmospheric pressure which is defined as Zero gage pressure. If my cpap pressure is 10 centimeters it would also be 1045 centimeters absolute pressure. It does not seem like much increase. If I breath in without cpap my lungs expand dropping my lung and airway pressure below atmospheric pressure. Since the pressure outside (atmospheric - Zero) is higher than my lung and airway (negative) pressure air flows from outside thru the airway to my lungs. (Air is pushed not pulled) The negative airway pressure which is required to inhale without cpap contributes to apnea for many people. My cpap machine provides me a new atmosphere (in the mask) at a (positive) higher pressure than the pressure outside the mask.
When I breath in with cpap my lungs still expand and the pressure drops below my new atmosphere so air will flow in but my lung pressure is positive when I start to breath in and if the cpap pressure is set high enough my lung and airway pressure remain positive throughout the breathing cycle. That is the purpose of cpap.

The cpap machine works in conjunction with the tubing and mask to control pressure. The mask has an exhilation port or orifice to control the flow of air from the circuit. The higher the pressure in the mask the more air flow from the mask. There is usually a pressure/flow chart furnished with the mask. The cpap machine has at a minimum a pressure sensor, flow sensor, and clock. These sensors send data to the cpap control circuit. If the pressure sensor detects low pressure, low flow, or whatever, more voltage is applied to the DC Motor and the machine speeds up and increases air flow to the tubing and mask. In order to exhaust the increased rate and volume of air flow the pressure in the mask increases. The machine keeps sensing pressure and varies the flow rate until the desired pressure is achieved at the machine. Since the important pressure is the pressure at the mask and not at the machine the machine is programmed to compensate for the pressure loss between the machine and the mask.

I hope that this is helpful and not just confusing.
GeneS
10-24-2012 10:25 AM
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BobF Offline

Preferred Members-2

Posts: 74
Joined: Aug 2012

Machine: ResMed S9 Elite
Mask Type: Full face mask
Mask Make & Model: Respironics Blue Gel Full Face Large
Humidifier: H5i
CPAP Pressure: 12
CPAP Software: ResScan

Other Comments:

Sex: Male
Location:

Post: #8
RE: How Does CPAP Machine Work?
Hi Gene. GREAT! Thanks for all the information. I appreciate it. Regards Bob.
10-24-2012 08:34 PM
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Sleepster Offline
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Posts: 4,180
Joined: Feb 2012

Machine: ResMed S9 VPAP Auto
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: H5i
CPAP Pressure: MaxI 13.6 | MinE 5.4 | PS 4.6
CPAP Software: ResScan SleepyHead

Other Comments: Diagnosed Nov 2011. Conquered aerophagia.

Sex: Male
Location: Houston, Texas

Post: #9
RE: How Does CPAP Machine Work?
Nicely done, genes. Well-done

Sleepster
Apnea Board Moderator
www.ApneaBoard.com


INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
10-25-2012 06:02 AM
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SuperSleeper Offline

Administrators

Posts: 10,315
Joined: Feb 2012

Machine: ResMed S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed Mirage Swift II
Humidifier: none
CPAP Pressure: 12.6 - 18 cmH20 (auto range)
CPAP Software: SleepyHead

Other Comments: Have diabetes Type II

Sex: Male
Location: Dixon, Illinois, USA

Post: #10
RE: How Does CPAP Machine Work?
Yep, much better explanation than my 'reverse vacuum cleaner' story. Coffee

Thanks Genes! Smile

SuperSleeper
Apnea Board Administrator
www.ApneaBoard.com


INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.

10-25-2012 07:51 AM
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