Patent ID: 9295796
Filing Date: 2016-03-29
CPC Classification: A61M

Claim Text:
1. A breathing system for ventilating a patient, comprising: a gas channel having a gas channel volume V and a compliance C; a monitoring location in said gas channel; a monitored gas flow Fm at said monitoring location which is either a measured flow at the monitoring location or a known flow from at least one gas source in communication with the gas channel; a flow estimate location in said gas channel at which a gas flow estimate Fe is determined, said flow estimate location being remote from said monitoring location; a plurality of pressure sensors measuring a respective plurality of pressures at different pressure measurement locations of said gas channel; and a computer comprising a program and operative to determine said gas flow estimate Fe at said flow estimate location and wherein said gas flow estimate is based on a relationship between said monitored gas flow Fm and a compressible gas flow Fc dependent on said compliance C, said compressible gas flow Fc being a flow of gas in said gas channel between said flow estimate location and said monitoring location, said computer also being operative to determine an estimated pressure Pe based on said plurality of measured pressures from said respective pressure sensors, and wherein said estimated pressure Pe is a volume weighted pressure Pv with respect to said gas channel volume V, and said computer also being operative to determine said compressible gas flow Fc based on a relationship between said compliance C and a differential of said estimated pressure Pe for determining said gas flow estimate Fe.