Pressure adjustment method for CPAP machine
AssigneeFisher & Paykel Healthcare Limited
InventorsDavid Robin Whiting, Andrew Gordon Gerred, Fiona Elizabeth Cresswell
Life of this patent
Estimating the term…
Abstract
A positive airway pressure apparatus is automatically adjusting. Pressure increases in response to apnea events when the apparatus is in one or more responsive states. Pressure does not increase in response to apnea events when the apparatus is in a non-responsive state. The apparatus switches between responsive and nonresponsive states depending upon any of a number of different criteria that help differentiate between open airway apnea events and closed airway apnea events.
Claims20
A method for controlling an automatically adjusting PAP apparatus, the method comprising:
- operating in a responsive state wherein the PAP apparatus is configured to respond to sleep disordered breathing events by increasing an output pressure by a preset amount;
- in response to the detected sleep disordered breathing events, increasing a counter;
- entering a pause state when the counter exceeds a threshold;
- in response to sensing a patient arousal or a predetermined period of time without sleep disordered breathing events, exiting the pause state and decreasing the output pressure;
- and
- in response to detecting a
- first sleep disordered breathing event after the decrease in the output pressure, increasing the output pressure by a function of the decrease in the output pressure.
An apparatus comprising:
- a gases flow source configured to supply gases to a patient in use;
- a sensor configured to sense pressure or flow or both, supplied by the flow source or supplied to the patient;
- and
- a controller configured to receive output from the sensor, determine sleep disordered breathing events based on the output from the sensor, and control an output pressure of the flow source according to a pressure adjusting algorithm wherein the controller is configured to:
- operate in a responsive state wherein the controller is configured to respond to sleep disordered breathing events by increasing an output pressure by a preset amount
- in response to the detected sleep disordered breathing events, increase a counter;
- enter a pause state when the counter exceeds a threshold;
- in response to sensing a patient arousal or a predetermined period of time without sleep disordered breathing events, exit the pause state and decrease the output pressure;
- and
- in response to detecting a first sleep disordered breathing event after the decrease in the output pressure, increase the output pressure by a function of the decrease in the output pressure.
Dependencies are inferred from the claim text.