SYSTEM AND METHOD FOR IDENTIFYING AND/OR MEASURING A SUBSTANCE CONCENTRATION IN THE EXHALED BREATH OF A PATIENT

摘要

A system for identifying and/or measuring a substance concentration in the exhaled breath of a patient (4), comprises a measurement apparatus (20) for performing an ion mobility spectrometry measurement of a sampling gas stream (A) obtained from the exhaled breath of the patient (4), the measurement apparatus (20) comprising a drift detector (22) and at least one gas circuit (23, 24) connected to the drift detector (22) for guiding an analytic gas stream (B), into which a sample of the sampling gas stream (A) is injectable, towards an inlet end (220) of the drift detector (22) and/or a drift gas stream (C) towards an outlet end (221) of the drift detector (22), wherein the at least one gas circuit (23, 24) comprises a molecular sieve filter (233, 241) comprising a filter material (26) for filtering the analytic gas stream (B) and/or the drift gas stream (C). Herein, the filter material (26) comprises the zeolite NaY. In this way a system for measuring a substance concentration in the exhaled breath of a patient is provided which allows for accurate measurements using the ion mobility spectrometry (IMS).