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Bi-Flex is a Philips-Respironics brand-specific term for CPAP Exhalation pressure relief.

According to the Philips-Respironics website: "Bi-Flex pressure relief technology offers pressure relief at inhalation and exhalation to make BiPAP therapy more like natural breathing. By tracking each breath, Bi-Flex pressure relief technology delivers pressure relief at three critical points in the breathing cycle: 1. the transition from exhalation to inhalation 2. the transition from inhalation to exhalation, and 3. during exhalation. " [1]