▎ 摘　　要

NOVELTY - one of said air pump based on expiration detection instrument of the graphene sensor, comprising a gas collecting device, comprising a connector, an air inlet pipe, an air pump and a helium gas source, for lung cancer screening is connected to said first connecting region, which is used for the first connection area to form negative pressure; the helium gas source, used for providing helium gas to the second connection region, breath collecting device comprises a graphene sensor, the graphene sensor according to the second connection region of the gas resistor change information detecting the gas in the second connection region to pulmonary tuberculosis or lung cancer screening. The utility model claims a lung cancer screening of the gas to be detected from the air inlet pipe suction to the first connecting region expiration detection instrument based graphene sensor, opening the first connecting valve so that the gas in the first connection area can be mixed with the helium gas in the second connection area, so the air pressure state to be detected gas under the condition of a certain degree of dilution to stable detection and improves the reliability of the detection.