Patent ID: 6213119
Filing Date: 2001-04-10
Classification: A61M

Abstract:
A controller for a flow generator to supply breathable gas cyclically at an inspiration pressure and at an expiration pressure substantially in synchronism with a patient's respiration, the controller comprising:(a) a data processor for receiving an input respiration flow signal and for detecting transitions between inspiration and expiration from said flow signal to discriminate between patient inspiration and expiration, and for outputting a control signal to the flow generator to set the inspiration pressure and the expiration pressure;(b) a first timer to manually adjust or select a first time duration commencing from the last transition to inspiration, whereby if said first time duration elapses before the data processor detects a transition to expiration by the patient, the output signal from the data processor causes the flow generator to supply said expiration pressure; and(c) a second timer to manually adjust or select a second time duration, shorter than or equal to said first time duration, commencing from said last transition to inspiration corresponding to the data processor forcing said flow generator to supply said inspiration pressure until said second time duration elapses even if during said second time duration there is a transition to expiration by the patient.