| 摘要 |
<p>The present invention relates to an apparatus for measuring the expiratory rate, comprising a measuring tube (13) partially obturated by a narrowing (17) of the interior of the tube, and a differential pressure sensor (27) coupled to the tube in order to measure the pressures in the tube on either side of the narrowing. The measuring tube (13) is removable and comprises on its external surface flexible annular seals (21) extending beyond the external surface and arranged on either side of the ports (18, 19) opening on either side of the narrowing. The measuring tube is intended to penetrate into a housing (11) of the apparatus having a diameter slightly larger than the external diameter of the measuring tube so that, in an abutment position (15) of the measuring tube in the housing, the seals define with the housing (11) and the external wall of the tube (14) annular chambers (23, 24) communicating respectively with two passages (25, 26) of the housing, which passages are connected to the pressure sensor.</p> |
