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US 8,985,109 B2Granted
Method and apparatus for resolving upper airway obstruction, resistance or instability
AssigneeResMed Limited
InventorPeter Edward Bateman
Life of this patent
Estimating the term…
Abstract
A CPAP apparatus has a variable rise time (iii) from a base level of positive air pressure during expiration (EPAP) to a higher level during inspiration (IPAP). The rise time is adjusted in order to reduce obstruction, resistance or instability in the upper airway.
Claims20
A method of control for a ventilator having a flow generator, the method comprising:
- controlling the flow generator to generate a flow of breathable gas, the control of the breathable gas being characterized by an expiratory pressure and a higher inspiratory pressure, the control of the breathable gas being further characterized by a rate of change of the expiratory pressure to the higher inspiratory pressure;
- detecting an event of upper airway instability;
- and
- decreasing the rate of change in response to the detection of an event of upper airway instability.
1 more element
A ventilator comprising:
- a flow generator configured for providing a breathable gas to a patient interface at a positive pressure;
- a sensor adapted to provide a signal indicative of respiratory airflow;
- and
- a controller configured to control the flow generator to generate a flow of breathable gas, the control of the breathable gas being characterized by an expiratory pressure and a higher inspiratory pressure, the control of the breathable gas being further characterized by a rate of change of the expiratory pressure to the higher inspiratory pressure,
- the controller further configured to detect an event of upper airway instability and decrease the rate of change in response to the detection of an event of upper airway instability.
2 more elements
A respiratory apparatus comprising:
- a flow generator configured for providing a breathable gas to a patient interface at a positive pressure;
- a sensor adapted to provide a signal indicative of respiratory airflow;
- and
- a controller configured to control the flow generator to generate a flow of breathable gas, the control of the breathable gas being characterized by an expiratory pressure and a higher inspiratory pressure, the control of the breathable gas being further characterized by a rate of change of the expiratory pressure to the higher inspiratory pressure,
- the controller further configured to detect an event of upper airway instability and decrease the rate of change in response to the detection of an event of upper airway instability,
- wherein the controller is configured to detect a patient breath and wherein the controller detects an event of upper airway instability by detecting obstruction or resistance.
3 more elements
Dependencies are inferred from the claim text.