Methods and apparatus for determining leak and respiratory airflow are disclosed. A pressure sensor (34) and a differential pressure sensor (32) have connection with a pneumotach (24) to derive instantaneous mask pressure and airflow respectively. A microcontroller (38) estimates a non-linear conductance...http://www.google.fr/patents/US6659101?utm_source=gb-gplus-shareBrevet US6659101 - Determination of leak and respiratory airflow
