| 摘要 |
An apparatus for sampling volumetric quantities of human exhaled breath has three conduits and may be provided in "Y" or "T" shaped configuration. The free end of one of the conduits is adapted to connect with the mouth of the subject being tested. Another of the conduits is adapted to pass ambient air to the subject, this conduit being provided with a suitable filtering mechanism such as a charcoal inhalation canister and an inlet check valve. The third of the three conduits supports an appropriate sampling canister for receiving exhaled breath from the subject, and this conduit also is provided with a one-way check valve. In another aspect of the invention, there is also provided a method for collecting a sample of exhaled breath from a subject to collect therefrom a selected analyte and to accurately quantify its presence in the subject's breath.
|
