Expiratory sampling bag

Abstract

An expiratory sampling bag which is used for collecting the carbon dioxide expired by a subject in 13C-urea breath diagnosis comprises a bag body, an expiratory intake, an exhaust hole and a control valve for controlling the communication between the exhaust hole and the bag body or the expiratory intake. At the initial stage of the expiration process of the subject, the control valve of the expiratory sampling bag is in a state a, the exhaust hole is opened, and communicates with a gas passage between the exhaust hole and the expiratory intake, the subject continuously expires toward the expiratory intake, and the expired gas is exhausted out of the bag body via the exhaust hole; at the final stage of the expiration process, the control valve is operated to be in a state b, the exhaust hole is closed, the subject continues to expire until the bag body is filled up with the gas, and since the gas expired into the bag body is the gas of the final stage of the expiration process, the concentration of the carbon dioxide in the expired gas sample is effectively increased.

Description

Technical field [0001] The invention relates to a breath sampling bag, especially for 13 C Urea Exhalation Diagnosis The exhalation sampling bag used to collect the exhaled carbon dioxide gas from the subject. Background technique [0002] Breath sampling bags have been widely used in 13 C urea breath test for the diagnosis of Helicobacter pylori infection in humans, after administration to subjects 13 Before C urea medicine and after taking the medicine for 30 minutes, the breath samples of the subjects were collected with breath sampling bags respectively, and the concentration in the breath samples was measured on the analytical instrument (infrared spectrometer or mass spectrometer). 13 The amount of change in C isotope abundance, for negative patients, in the breath samples before and after taking the medicine 13 The abundance of C isotope hardly changes, while the C isotopic abundance in the breath samples before and after taking the medicine 13 The abundance of C ...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that the existing sampling bags cannot collect high-concentration carbon dioxide breath samples, the present invention provides a breath sampling bag. When the sampling bag is in use, the subject does not need to hold his breath for a long time. Through simple control, some or all of the exhaled breath at the beginning of the exhalation process is discharged to the atmosphere, and the exhaled breath sample containing high concentration of carbon dioxide at the end of the exhaled breath of the subject is collected

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