A method and system to separate a system exhaust leak flow from a patient respiratory flow in a respiratory treatment system

摘要

A respiratory treatment system and method to separate a system exhaust leak flow from a patient respiratory flow is disclosed. The respiratory treatment system comprises a flow generator, a pressure sensor, a frequency sensor, and a processor. The flow generator is configured to generate pressurized breathable gas at a patient interface having a continuous system exhaust leak flow. The pressure sensor is configured to measure pressure associated with the generated pressure. The frequency sensor is configured to measure a system variable, where the system variable is not a pressure. The processor is coupled with the sensors and the flow generator and is configured to: calculate a pressure of the flow generator from the measured system variable; determine flow values as a function of the measured pressure and the calculated pressure; determine a filtered flow measure based on the flow values to determine the system exhaust leak flow; and separate the system exhaust leak from the flow values to derive a respiratory flow by subtracting the system exhaust leak flow from the flow values.