Patent ID: 9192324
Filing Date: 2015-11-24
Classification: A61B,G06K,G07C

Abstract:
1. An apparatus for monitoring alcohol in the breath of a test client, said apparatus comprising: a sample chamber receiving a breath sample during the exhalatory phase of a test client; an alcohol sensor measuring the alcohol content of the breath sample from the sample chamber; a spirometric sensor generating spirometric data over a test clients entire exhalatory phase from the same breath sample into the sample chamber; a means for storing client characterization data based at least in part on the shape of the flow versus time curve of the exhalatory phase for a known client, wherein the client characterization data comprises a probability density in a phase space in which a first spirometric variable is correlated with at least a second spirometric variable; and a processor analyzing spirometric data from the spirometric sensor and stored client characterization data to determine whether the test client is the known client.