Patent ID: 8915861

Claim:
An adaptor, adapted to be attached on a face of the subject to collect expiration gas of the subject, the adaptor comprising: an airway case, formed with a chamber, and adapted to be coupled with a carbon dioxide sensor so that carbon dioxide in the expiration gas flowing through the chamber is detected by the carbon dioxide sensor; a mouth guide adapted to lead oral expiration gas of the subject to the chamber when the adaptor is attached on the face of the subject; nasal tubes, adapted to be inserted into nostrils of the subject when the adaptor is attached on the face of the subject, the nasal tubes form a first flow path through which a first portion of nasal expiration gas of the subject is fluidly communicated to the chamber and combined with the oral expiration gas in the chamber; a branch tube disposed proximate to the nasal tubes, which separates from the nasal tubes and forms a second flow path through which a second portion of nasal expiration gas of the subject is fluidly communicated from the nasal tubes to an external pressure sensor; and a flow direction regulator adapted to be positioned directly below the nostrils of the subject and including a projection projecting toward the nostrils of the subject when the adaptor is attached on the face of the subject, and configured to direct flow of the second portion of the nasal expiration gas on the second flow path from the nasal tubes to the external pressure sensor through the branch tube.