Breathing system with flow estimation
First Claim
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.
1 Assignment
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Accused Products
Abstract
A breathing system for ventilating a patient has a gas channel enclosing a gas channel volume (V), and a compliance (C). The system has a flow calculation unit operative to determine a gas flow estimate (Fe) at a flow estimate location in the gas channel. The gas flow estimate (Fe) is based on a relationship between a monitored gas flow (Fm) in the gas channel and a compressible gas flow (Fc) which depends on the compliance (C) in the gas channel. The monitored gas flow (Fm) is a gas flow at a monitoring location in the gas channel and the compressible gas flow (Fc) is a flow of gas in the gas channel between the flow estimate location and the monitoring location, and the flow estimate location is remote from the monitoring location.
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Citations
23 Claims
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1. A breathing system for ventilating a patient, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for ventilating a patient, comprising the steps of:
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providing in a breathing system 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 channels, and a computer comprising a program; and with said computer determining 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 depended 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, determining 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 with said computer also determining 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. - View Dependent Claims (23)
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Specification