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1. (WO2017189808) SYSTEM AND METHOD FOR ACCURATE ESTIMATION OF INTENTIONAL AND UNINTENTIONAL LEAKS IN FLOW GENERATION SYSTEMS

Pub. No.:    WO/2017/189808    International Application No.:    PCT/US2017/029771
Publication Date: Fri Nov 03 00:59:59 CET 2017 International Filing Date: Fri Apr 28 01:59:59 CEST 2017
IPC: A61M 16/00
Applicants: INVENT MEDICAL CORPORATION
Inventors: CHANG, Samuel, M.
NGUYEN, Nhien, M.
Title: SYSTEM AND METHOD FOR ACCURATE ESTIMATION OF INTENTIONAL AND UNINTENTIONAL LEAKS IN FLOW GENERATION SYSTEMS
Abstract:
In one embodiment, a method for accurate leak estimation in a flow generation system includes measuring a total flow through the flow generation system, measuring a pressure in the primary flow circuit of the flow generation system, determining when the measured pressure is within a predetermined threshold of EPAP, and calculating an intentional leak flowrate and an unintentional leak flowrate based on the relationship QFS(t) = QIL(t) + QUL(t) when the measured pressure is within the predetermined threshold. In another embodiment, a flow generation system includes in one embodiment an airflow generator connected in-line to a flow sensor, a pressure sensor and a patient interface connection by a first gas flow circuit, and a controller electrically coupled to the airflow generator, the flow sensor and the pressure sensor.