DOWN-SIZED SINGLE DIRECTIONAL RESPIRATORY AIR FLOW MEASURING TUBE

摘要

Disclosed is a down-sized single directional respiratory air flow measuring tube suitable for an electronic respiratory air flow measuring device such the patients having chronic respiratory disease perform self-test. The down-sized single directional respiratory air flow measuring tube includes: a cylindrical pipe including an inlet making contact with a mouth of an examinee and an outlet facing the inlet, in which the cylindrical pipe includes disposable paper or disposable plastic; and a detection rod positioned closely to the outlet, expanding out of a lower portion of the cylindrical pipe while passing through the cylindrical pipe from an upper portion of the cylindrical pipe, and formed with a closed upper portion, in which the detection rod has a plurality of sampling holes to measure dynamic pressure of a respiratory air flow at the first side of the inlet of the cylindrical pipe such that an air flow between the center portion and a wall surface of the cylindrical pipe is measured.