Chapter 3 Modes, Features, and Alarms
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Bi-Flex
In S mode, the Bi-Flex attribute adjusts therapy by inserting a small
amount of pressure relief during the latter stages of inspiration and
during the beginning part of exhalation. In the following diagram,
the bold lines represent Bi-Flex in comparison to the dashed line
representing normal BiPAP therapy. Bi-Flex levels of 1, 2, or 3
progressively reect increased pressure relief that will take place at
the end of inspiration and at the beginning of expiration.
PRESSURE
IPAP
EPAP
TIME
BiPAP
Bi-Flex
3
1
2
Ramp
The device is equipped with a linear ramp function. In CPAP, S, S/T, T,
and PC modes, the Ramp feature will reduce the pressure and then
gradually increase (ramp) the pressure to the prescription pressure
setting so patients can fall asleep more comfortably. The gure below
illustrates how the ramp function works.
TIME
Note: Bi-Flex is only available
up to 25 cm H2O in S mode.
Bi-Flex in Comparison to
Traditional Bi-Level Therapy
Note: IPAP will not ramp below
4 cm H2O.
The Ramp Function