Patent ID: 9399109
Filing Date: 2016-07-26
CPC Classification: A61M

Claim Text:
1. A respiratory assistance device, comprising: a variable speed blower with an output; a patient ventilation interface configured for fitment on a patient respiratory passageway, the patient ventilation interface including a ventilation mask and a piloted exhalation valve coupled to the ventilation mask; a gas passage conduit coupling the output of the blower to the patient ventilation interface, a pilot line from the gas passage conduit being coupled to the pilot of the exhalation valve; a pressure sensor for measuring a mask pressure in the patient ventilation interface; a blower speed sensor for measuring a speed of the blower; and a pressure controller, in communication with the pressure sensor and the blower speed sensor, that detects a patient inspiratory phase and a patient expiratory phase based on either or both of the measured speed of the blower and a set speed of the blower, the pressure controller adjusting an operating speed of the blower and actuating the piloted exhalation valve by selective application of fluid pressure to the pilot line from the gas passage conduit based upon the measured mask pressure.