Fault diagnosis in CPAP and NIPPV devices
AssigneeResMed Limited
InventorsGregory Colla, Barton Kenyon
Life of this patent
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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
1-19. (canceled)
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 produce a motor speed transducer signal, a motor drive parameter transducer configured to produce a motor drive parameter transducer signal, and a timer, the method comprising:
- monitoring the motor speed;
- monitoring the motor drive parameter transducer signal;
- following a predetermined duration, comparing the motor drive parameter transducer signal 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 motor 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 motor drive parameter transducer configured to produce a motor drive parameter transducer signal, and a display, the method comprising:
- determining a motor fault;
- providing a warning notice on the display;
- and
- disabling power to the motor or otherwise disabling operation of the apparatus until service can be performed.
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 motor drive parameter transducer configured to produce a motor drive parameter transducer signal;
- a timer;
- and
- a controller configured to:
- monitor the motor speed transducer, the motor drive parameter transducer, and the timer;
- compare, following a predetermined duration, the motor drive parameter transducer signal 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 motor 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 motor drive parameter transducer configured to provide a motor drive parameter transducer signal;
- a display;
- and
- a controller configured to:
- determine a motor fault;
- provide a warning notice on the display;
- and
- disabling power to the motor or otherwise disabling operation of the apparatus until service can be performed.
Dependencies are inferred from the claim text.