Patent ID: 7000612
Filing Date: 2006-02-21
Classification: A61M

Abstract:
1. A system for providing a flow of gas to a patient comprising: a pressure generating system adapted to provide a flow of gas responsive to a control signal; a patient circuit having a first end coupled to the pressure generating system and adapted to communicate the flow of gas with an airway of a patient; a flow monitor operatively coupled to the pressure generating system or the patient circuit; a pressure monitor operatively coupled to the patient circuit; an exhaust assembly adapted to communicate gas from within the patient circuit to ambient atmosphere; and a controller that receives a first output from the flow monitor and a second output from the pressure monitor and outputs the control signal that controls the flow of gas delivered to the patient circuit by the pressure generating system and, hence, the flow of gas at a patient's airway, wherein the controller detects onset of an inspiratory phase of a patient's breathing cycle for triggering an inspiratory flow of gas based on such a patient's inspiratory effort, which is determined based on both a flow related parameter determined from the first output and a pressure related parameter determined from the second output.