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Wisp stats
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mousetrap Offline

Members

Posts: 17
Joined: Jul 2013

Machine: Philips System One 60 Series Auto
Mask Type: Nasal mask
Mask Make & Model: Philips Wisp
Humidifier: Philips System One
CPAP Pressure: 8-16 APAP
CPAP Software: SleepyHead

Other Comments: And my nightshift manager use to say "Sleep is for the weak..."

Sex: Male
Location: Sydney, Australia

Post: #1
Wisp stats
Just browsing the handbook which came with the Wisp mask as I was trying to see if there was mention of the intentional leak rate for this mask. I can't seem to find that information.

Does anyone know the stats?

Also, as you may be aware the Wisp comes with three size nasal masks. There is mention in the booklet of "Deadspace Volume" as follows:

P 37mL
S/M 49mL
L 73mL

Can someone explain what these figures refer to please?
08-09-2013 05:25 AM
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RonWessels Offline

Preferred Members-2

Posts: 465
Joined: Jun 2013

Machine: REMstar Auto AFlex DS560TS
Mask Type: Nasal mask
Mask Make & Model: ComfortGel Blue
Humidifier: REMstar Heated Tube DS6T
CPAP Pressure: 11 - 20
CPAP Software: SleepyHead

Other Comments: CMS50F Pulse Oximeter

Sex: Male
Location: Ontario, Canada

Post: #2
RE: Wisp stats
Assuming you put the CPAP air supply tube directly into your nose, there would be no "dead space". However, that's not what this mask does. The air hose connects to a plastic "bubble" that then seals to your nose. This volume of the plastic "bubble" is what I suspect they call the "dead space".

My brief usage of Google-fu could not find a User Manual for the Wisp mask. Furthermore, it appears that Respironics has not updated their intentional mask leak document with data for the Wisp. So, unless it is mentioned in your manual, the only way to get that information would be to call Respironics directly and ask them.
08-09-2013 05:24 PM
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zonk Offline

Advisory Members

Posts: 7,908
Joined: Feb 2012

Machine: A10 AutoSet
Mask Type: Nasal mask
Mask Make & Model: Activa LT
Humidifier: Integrated /ClimateLineAir
CPAP Pressure: 9/13
CPAP Software: ResScan

Other Comments: CPAP since Nov 2010

Sex: Male
Location: Australia

Post: #3
RE: Wisp stats
with absence of any info from Respironcis, I suspect the Wisp vents leak rate is the same as True Blue and EasyLife nasal masks
@10 .... both 26 L/min http://www.healthcare.philips.com/asset....111027.pdf
08-09-2013 05:45 PM
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mousetrap Offline

Members

Posts: 17
Joined: Jul 2013

Machine: Philips System One 60 Series Auto
Mask Type: Nasal mask
Mask Make & Model: Philips Wisp
Humidifier: Philips System One
CPAP Pressure: 8-16 APAP
CPAP Software: SleepyHead

Other Comments: And my nightshift manager use to say "Sleep is for the weak..."

Sex: Male
Location: Sydney, Australia

Post: #4
RE: Wisp stats
Thanks guys for your replies Smile
08-09-2013 09:11 PM
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RonWessels Offline

Preferred Members-2

Posts: 465
Joined: Jun 2013

Machine: REMstar Auto AFlex DS560TS
Mask Type: Nasal mask
Mask Make & Model: ComfortGel Blue
Humidifier: REMstar Heated Tube DS6T
CPAP Pressure: 11 - 20
CPAP Software: SleepyHead

Other Comments: CMS50F Pulse Oximeter

Sex: Male
Location: Ontario, Canada

Post: #5
RE: Wisp stats
Well OK, if you are willing to go with a guess based on similarity. I wouldn't be too surprised if it were off by as much as 3 L/min, though!! Dodgy Rolleyes
08-09-2013 09:17 PM
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Roelof Offline

New Members

Posts: 3
Joined: Jun 2013

Machine: System One RemStar Pro with C-Flex+ (461P)
Mask Type: Nasal mask
Mask Make & Model: Respironics Comfortgel Blue
Humidifier: Respironics
CPAP Pressure: 6
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: the Netherlands

Post: #6
RE: Wisp stats
The Wisp has a "System One resistance" rating of 1, the same as the TrueBlue, Comfortgel Blue or the Optilife, so the leak rate should be similar. But yes, that leaves a few liters variation.

As to dead space: that is the volume of air in a mask that is not replaced by the airflow from the cpap between breaths. When you exhale, the air goes out through the vent but the last bit of air stays in the mask and is inhaled again the next cycle followed by a huge volume of fresh air from the cpap machine.

If you had a deadspace running into liters, you would exhale into the mask and inhale the same air again in the next cycle, slowly increasing the carbon dioxide level and decreasing oxygen. A dead volume of a few mililiters is completely insignificant compared to the volume of air your lungs replace each breath so for cpap masks it does not matter. For deepsea diving equipment this stuff is vital however.
08-10-2013 07:41 AM
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