Method and apparatus for measuring functional residual capacity (FRC) and cardiac output(CO)
AssigneeGE Healthcare Finland Oy
InventorOla Stenqvist
Life of this patent
Estimating the term…
Abstract
The present invention relates to a method and an apparatus for measuring Functional Residual Capacity (CO). Further, it relates to a method and an apparatus for measuring cardiac output (CO). The method comprises the steps of determining the amount of oxygen and carbon dioxide being inhaled and exhaled during at least two breathing cycles, identifying at least one difference between said breathing cycles, and estimating the FRC and/or CO based on the determined uptake of oxygen and excretion of carbon dioxide and said identified difference.
Claims52
A method for estimation of functional residual capacity (FRC) in a person, comprising:
- establishing a breathing pattern;
- determining the amount of oxygen and carbon dioxide being inhaled and exhaled during a first breathing cycle comprised by said breathing pattern;
- accomplishing a first change in said breathing pattern of known magnitude;
- determining the amount of oxygen and carbon dioxide being inhaled and exhaled during a second breathing cycle;
- estimating the FRC based on the determined amounts of oxygen and carbon dioxide in said first and second breathing cycles.
An apparatus for measuring functional residual capacity (FRC), comprising:
- means for establishing a breathing pattern;
- means for determining the amount of oxygen and carbon dioxide being inhaled and exhaled during a first breathing cycle comprised by said breathing pattern;
- means for accomplishing a first change in said breathing pattern of known magnitude;
- means for determining the amount of oxygen and carbon dioxide being inhaled and exhaled during a second breathing cycle;
- means for estimating the FRC based on the determined amounts of oxygen and carbon dioxide in said first and second breathing cycles.
A method for estimation of functional residual capacity (FRC), comprising the steps of determining the amount of oxygen and carbon dioxide being inhaled and exhaled during at least two breathing cycles, identifying at least one difference between said breathing cycles, and estimating the FRC based on the determined amount of oxygen and carbon dioxide and said identified difference.
An apparatus for estimation of functional residual capacity (FRC), comprising measuring means for determining the amount of oxygen and carbon dioxide being inhaled and exhaled during at least two breathing cycles, means for identifying at least one difference between said breathing cycles, and processing means for calculation of an estimated FRC based on the measured amount of oxygen and carbon dioxide and said identified difference.
Dependencies are inferred from the claim text.