COLLECTION AND ANALYSIS OF VOLUME OF EXHALED GAS WITH COMPENSATION FOR FREQUENCY OF BREATHING PARAMETER

摘要

PROBLEM TO BE SOLVED: To provide apparatuses which accurately determine a gas concentration of a sample of a patient's breath.SOLUTION: Apparatuses include a sample compartment, a breath speed analyzer, a gas analyzer, and a processor. The sample compartment includes an inlet that receives the breath. The breath speed analyzer determines the speed of a portion of the breath. The gas analyzer determines a gas concentration. The processor includes an algorithm that determines a degree of non-homogeneity of the sample based on the speed, and a corrected gas concentration based on the degree of non-homogeneity. In some deformation forms, the gas correction is determined independently of patient cooperation. The apparatuses may be tuned based on the intended population's expected breathing pattern ranges such that the sample compartment is filled with a homogenous end-tidal gas sample regardless of an individual's breathing pattern. These apparatuses are useful, for example, for end-tidal CO analysis. Methods are also described.SELECTED DRAWING: None