Carbon-dioxide and Oxygen Respiratory Ventilator Energy Tracker (CORVET)
AssigneesMassachusetts Institute of Technology, Koninklijke Philips N.V.
InventorsGary A Shaw, Lawrence M Candell, Kyle THOMPSON, Allison Norloff, Donald Johnson, Roberto Buizza, Francesco Vicario
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Abstract
A respiratory monitoring system with improved detection of oxygen consumption is described. The system uses one or two mixing chambers and samples gases at selective locations for reliable detection of oxygen over extended periods of time with autonomous detection of calibration drift. The system can be used for indirect calorimetry and monitoring health of a subject.
Claims20
A respiratory monitoring system comprising:
- a first multi-way valve;
- a mixing chamber having an input port fluidically coupled to the first multi-way valve;
- an oxygen sensor coupled to the mixing chamber;
- an inhalation input-sampling flow line fluidically coupled at a first end to the first multi-way valve and to fluidically couple at a second end to an inhalation line that is fluidically coupled to breathing apparatus for a subject;
- and
- an exhalation input-sampling flow line fluidically coupled at a first end to the first multi-way valve and to fluidically couple at a second end to an exhalation line that is fluidically coupled to the breathing apparatus for the subject,
- wherein the first multi-way valve is configured to switch coupling of the input port of the mixing chamber between a first configuration where the input port is fluidically coupled to the inhalation input-sampling flow line and a second configuration where input port is fluidically coupled to the exhalation input-sampling flow line.
A method of respiratory monitoring with a respiratory monitoring system, the method comprising:
- during a first interval of time, receiving inhalation gas for a subject in a mixing chamber, wherein the inhalation gas is sampled from an inhalation line of the respiratory monitoring system and the inhalation line connects to breathing apparatus used by the subject;
- detecting a first concentration of oxygen in the mixing chamber with an oxygen sensor during the first interval of time;
- changing, with a multi-way valve, coupling of an input port of the mixing chamber from being fluidically coupled to the inhalation line to being fluidically coupled to an exhalation line of the respiratory monitoring system;
- during a second interval of time, receiving exhalation gas from the subject in the mixing chamber, wherein the exhalation gas is sampled from the exhalation line and the exhalation line is coupled to the breathing apparatus;
- detecting a second concentration of oxygen in the mixing chamber with the oxygen sensor during the second interval of time;
- and
- computing a value relevant to health of the subject based at least in part on a difference between the first concentration of oxygen and the second concentration of oxygen.
Dependencies are inferred from the claim text.