A BREATHING APPARATUS WITH COMPUTATION OF THE AIRFLOW PROVIDED TO THE PATIENT USING ONLY PRESSURE SENSORS

摘要

The invention concerns an apparatus (1) to assist patient respiration by delivering air to a patient through a mask, said mask being designed to be connected on one first extremity of a tube (20), said apparatus (1) comprising, a) a control unit (2) to adjust the pressure delivered by the blower (4) of said apparatus (1), b) a first pressure sensor (6) for sensing the pressure PM at said first tube extremity and being connected to said control unit (2), and c) a second pressure sensor (8) for sensing the pressure PB at the air output of said blower (4) and being connected to said control unit (2); in order that, when a tube (20) is connected to said mask and connected to said apparatus (1) on its said second extremity, the air flowing from the apparatus (1) to the mask, said control unit (2) is able to calculate the airflow at said, second extremity of the tube (20) from said pressures PM and PB and from the airflow resistance coefficient Kr of said tube (20) .