RE: Tubing Makes A Difference
Detection of airflow for auto-on and auto-pressure may be affected by the stiffness of the plastic in the tubing, even at a level which cannot be discerned by a casual examination. In such an application the plastic functions as a high-cut filter; above a certain frequency, fluctuations in pressure will not be transmitted from one end of the tubing to the other. This characteristic is directly affected by the physical properties of the plastic compound and how it is moulded.
Transmission of high frequency pulses, too high to be detectable by the user, is what makes detection of obstructive apnea possible in auto-PAP and perhaps in this machine the auto-on is an adjunct to this same sensing-detection function.
We already know that there is a slight but measurable size difference, and that would affect the operation of this "high-cut filter" too.
In many fields, from replacement needles for high-quality vinyl record playback to knock-off auto parts from China, reverse-engineering often overlooks aspects of the original parts' design, and the OEM isn't going to tell the copycats. Add that to cost-cutting by the imitators, as in replacement smartphone batteries.
Now maybe we can add CPAP tubing to the list.
Transmission of high frequency pulses, too high to be detectable by the user, is what makes detection of obstructive apnea possible in auto-PAP and perhaps in this machine the auto-on is an adjunct to this same sensing-detection function.
We already know that there is a slight but measurable size difference, and that would affect the operation of this "high-cut filter" too.
In many fields, from replacement needles for high-quality vinyl record playback to knock-off auto parts from China, reverse-engineering often overlooks aspects of the original parts' design, and the OEM isn't going to tell the copycats. Add that to cost-cutting by the imitators, as in replacement smartphone batteries.
Now maybe we can add CPAP tubing to the list.
