Spirometer

A - Human Necessities – 61 – B

Patent

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Details

A61B 5/08 (2006.01) A61M 11/00 (2006.01) G01F 1/37 (2006.01) G01F 1/42 (2006.01)

Patent

CA 2546331

Pocket-size medical spirometer (10) comprising a housing (12) and a measurement unit (20) (MU), for measuring rate of total flow when a user exhales through the spirometer. The MU comprises a fluidic jet oscillator adapted to generate oscillating flow with frequency dependent on the rate of flow therethrough. The MU is disposed within the housing so as to form a bypass flow path defined between an outer surface of the MU and an inner surface of the housing. A measurement flow path is defined through the fluidic jet oscillator, such that the total flow is divided into a bypass flow and a measurement flow, the latter being less than the former at least by an order of magnitude. The spirometer further comprises a pressure or velocity transducer and an electronic circuit adapted to derive the total flow rate or volume from the transducer signal.

L'invention concerne un spiromètre médical de poche, qui comprend un boîtier et un module de mesure (MU) pour mesurer un taux d'écoulement total lorsqu'un usager expire à travers le spiromètre. Le MU comprend un oscillateur de jet liquide adapté pour générer un écoulement oscillant dont la fréquence dépend du taux d'écoulement du flux qui le traverse. Le MU est disposé à l'intérieur du boîtier de façon à former un circuit d'écoulement de dérivation délimité entre une surface extérieure du MU et une surface intérieure du boîtier. Un circuit d'écoulement de mesure traverse l'oscillateur de jet liquide, si bien que l'écoulement total est divisé en flux secondaire et en flux de mesure, ce dernier étant moins important que le premier, ne serait-ce que par ordre de grandeur. Le spiromètre comprend en outre un transducteur de pression ou de vitesse et un circuit électronique conçu pour déduire le taux d'écoulement total ou le volume du signal du transducteur.

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