BACKGROUND

The present invention relates to sampling breath gas.

A breath sample is collected for breath gas analysis by mass spectroscopy for the purpose of, for example, rapid and non-invasive blood vapor detection.

SUMMARY

According to an embodiment of the present invention, there is provided a method for sampling breath gas. The method includes collecting a first breath sample in a first bag. The first breath sample is an initial part of expired gas expired after inspiration. The method further includes collecting a second breath sample in a second bag. The second breath sample is a latter part of the expired gas. The method further includes subtracting first mass spectral data from second mass spectral data. The first mass spectral data is obtained by mass spectroscopy of the first breath sample collected in the first bag. The second mass spectral data is obtained by mass spectroscopy of the second breath sample collected in the second bag.

According to another embodiment of the present invention, there is provided an apparatus for sampling breath gas. The apparatus includes a first bag, a second bag, and a controller. The controller is for controlling a first breath sample to flow in the first bag and controlling a second breath sample to flow in the second bag so that first mass spectral data is subtracted from second mass spectral data. The first breath sample is an initial part of expired gas expired after inspiration. The second breath sample is a latter part of the expired gas. The first mass spectral data is obtained by mass spectroscopy of the first breath sample in the first bag. The second mass spectral data is obtained by mass spectroscopy of the second breath sample in the second bag.

According to yet another embodiment of the present invention, there is provided a system for analyzing breath gas. The system includes a bag unit which includes a first bag and a second bag. The first bag is a bag in which a first breath sample is collected. The first breath sample is an initial part of expired gas expired after inspiration. The second bag is a bag in which a second breath sample is collected. The second breath sample is a latter part of the expired gas. The system further includes a mass spectrometer which obtains first mass spectral data and second mass spectral data. The first mass spectral data is obtained by mass spectroscopy of the first breath sample collected in the first bag, and the second mass spectral data is obtained by mass spectroscopy of the second breath sample collected in the second bag. The system further includes a data processor which subtracts the first mass spectral data from the second mass spectral data.

