Fault diagnosis in CPAP and NIPPV devices
AssigneeResMed Limited
InventorsGregory A. Colla, Barton Kenyon
Life of this patent
Estimating the term…
Abstract
A ventilation device for non-invasive positive pressure ventilation (NIPPV) or continuous positive airway pressure (CPAP) treatment of a patient has a gas flow generator, a gas delivery circuit optionally including a humidifier, a controller and sensors monitoring values of operational parameters of the device. The device further includes one or more relationships stored in data storage of the controller relating combinations of parameter values as being indicative of fault conditions of the device operation, the sensors and/or the fault detection process.
Claims20
A method of detecting a fault in an apparatus for supplying breathable gas to a patient at a positive pressure, the apparatus including a gas flow generator comprising a servo controlled motor and impeller, a motor speed transducer configured to monitor motor speed, a flow transducer configured to monitor gas flow, and a timer, the method comprising:
- monitoring the motor speed;
- monitoring the gas flow;
- following a predetermined duration, comparing the gas flow to a first threshold and the motor speed to a second threshold to derive a first compared value and a second compared value, respectively;
- and
- determining a flow transducer fault in accordance with the first compared value and the second compared value.
A method of operating an apparatus for supplying breathable gas to a patient at a positive pressure, the apparatus including a gas flow generator comprising a servo controlled motor and impeller, a motor speed transducer, a flow transducer configured to monitor gas flow, and a display, the method comprising:
- determining a flow transducer fault;
- providing a warning notice on the display;
- and
- changing mask pressure over a predetermined period of time.
An apparatus for supplying breathable gas to a patient at a positive pressure, including a gas flow generator comprising:
- a servo controlled motor and impeller;
- a motor speed transducer configured to monitor motor speed;
- a flow transducer configured to monitor gas flow developed by the gas flow generator;
- a timer;
- and
- a controller configured to:
- monitor the motor speed transducer, the flow transducer, and the timer;
- compare, following a predetermined duration, the gas flow to a first threshold and the motor speed to a second threshold to derive a first compared value and a second compared value, respectively;
- and
- determine a flow transducer fault in accordance with the first compared value and the second compared value.
An apparatus for supplying breathable gas to a patient at a positive pressure, including a gas flow generator comprising:
- a servo controlled motor and impeller;
- a motor speed transducer;
- a flow transducer configured to monitor gas flow developed by the gas flow generator;
- a display;
- and
- a controller configured to:
- determine a flow transducer fault;
- provide a warning notice on the display;
- and
- change mask pressure over a predetermined period of time.
Dependencies are inferred from the claim text.