System of collection and preparation of patient’s exhalation samples for medical laser photoacoustic gas analyzer
I.V. Sherstov1, R.V. Pustovalova1, K.G. Zenov2
1Institute of Laser Physics SB RAS, Ac. Lavrentyev's prosp., 13/3, Novosibirsk, 630090, Russia
2Special technologies, Ltd, Zeljonaja gorka str., 1/3, Novosibirsk, 630060
Keywords: лазерный оптико-акустический газоанализатор, пробоподготовка, осушение пробы выдоха пациентов, laser photoacoustic analyzer, sample preparation, drying of patient’s exhalation sample
Abstract
The system of collection and preparation of patient’s exhalation samples for medical laser photoacoustic gas analyzer is developed and tested. A comparative study of different types of exhaled air dryers is carried out. It is proposed to produce the dehumidification of expiratory sample directly in the sampling bag by freezing the moisture in the freezer, then transferring the drained sample to the analyzer via syringe. It is experimentally shown that when exposing an expiratory sampling probe packet for 10 min at -18 oC the water vapor content in the sample decreased by ~20 times. A gas circuit diagram of a medical laser gas analyzer is developed, which allows sterilization of the inner surfaces of the gas system using ozone.
|
