Patent ID: 9682208
Date: 2017-06-20
CPC Classifications: A61M

Claim:
1. A method of control for a respiratory pressure treatment apparatus comprising: generating a flow of breathable gas at a patient interface with a respiratory pressure treatment apparatus, the flow of breathable gas being synchronized with a respiratory cycle, the flow of breathable gas comprising expiratory pressure portions and inspiratory pressure portions wherein an expiratory pressure portion is at a pressure lower than an inspiratory pressure portion by a level of expiratory pressure relief; measuring a flow of breathable gas at the patient interface; detecting obstruction to flow from the measure of flow with a controller of the respiratory treatment apparatus and successively increasing pressure of the inspiratory pressure portions in response to obstruction detections while maintaining a set level of expiratory pressure relief for the expiratory pressure portions; detecting persistent obstruction to flow from the measure of flow with the controller of the respiratory treatment apparatus based on the successively increasing pressure of the inspiratory pressure portions; and with the controller, modifying control parameters for at least one of the expiratory pressure portions to modify the level of expiratory pressure relief delivered during the expiratory pressure portion in response to the detection of the persistent obstruction, the modifying being a decrease in the level of expiratory pressure relief.