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US 11,944,755 B2Granted
Methods and system for oxygen sensor prognostics in a medical gas flow device
AssigneeGE Precision Healthcare LLC
InventorChandra Aloke Kopalli
Life of this patent
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Abstract
Methods and systems are provided for an oxygen sensor included in a medical gas flow device, such as an anesthesia machine. In one embodiment, a method for a medical gas flow device comprises tracking an output voltage of an oxygen sensor during calibration over time, and, responsive to the output voltage decreasing by at least threshold amount from an initial calibration output voltage, estimating an end-of-life date of the oxygen sensor and outputting a replacement notification.
Claims15
A method for a medical gas flow device, comprising:
- controlling at least one valve of the medical gas flow device to flow a first gas having a first oxygen concentration through an inspiratory flow passage having an oxygen sensor, and detecting, by the oxygen sensor, a first oxygen concentration calibration measurement at a first frequency;
- controlling the at least one valve of the medical gas flow device to flow a second gas having a second oxygen concentration through the inspiratory flow passage having the oxygen sensor, and detecting, by the oxygen sensor, a second oxygen concentration calibration measurement at a second frequency that is less than the first frequency;
- and
- responsive to the second oxygen concentration calibration measurement decreasing by at least a threshold amount from the first oxygen concentration calibration measurement, estimating an end-of-life date of the oxygen sensor and outputting a replacement notification on a display of the medical gas flow device,
- wherein estimating the end-of-life date of the oxygen sensor includes averaging a first end-of-life date determined based on the first oxygen concentration calibration measurement and a second end-of-life date determined based on the second oxygen concentration calibration measurement.
2 more elements
A method for an anesthesia machine, comprising:
- controlling at least one valve of the anesthesia machine to flow a first gas having a first oxygen concentration through an inspiratory flow passage having an oxygen sensor, and detecting, by the oxygen sensor, a first oxygen concentration calibration measurement at a first frequency;
- controlling the valve of the anesthesia machine to flow a second gas having a second oxygen concentration through the inspiratory flow passage having the oxygen sensor, and detecting, by the oxygen sensor, a second oxygen concentration calibration measurement at a second frequency that is less than the first frequency;
- estimating an end-of-life date of the oxygen sensor responsive to the second oxygen concentration calibration measurement being at least a threshold amount from the first oxygen concentration calibration measurement;
- outputting a first replacement notification responsive to the end-of-life date being greater than a threshold duration;
- and
- outputting a second replacement notification responsive to the end-of-life date being less than the threshold duration,
- wherein the second oxygen concentration is greater than the first oxygen concentration, and
- wherein estimating the end-of-life date comprises:
- estimating a first end-of-life date based on a first rate of change in the first oxygen concentration calibration measurement between a current calibration and a most recent previous calibration at the first oxygen concentration;
- estimating a second end-of-life date based on a second rate of change in the second oxygen concentration calibration measurement between the current calibration and a most recent previous calibration at the second oxygen concentration;
- and
- determining the end-of-life date based on both of the first end-of-life date and the second end-of-life date.
9 more elements
A system for a medical gas flow device, comprising:
- an inspiratory flow passage configured to flow a first gas and a second gas from at least one gas source to a patient breathing circuit;
- one or more valves configured to control flow of the first gas and the second gas through the inspiratory flow passage;
- an oxygen sensor positioned in the inspiratory flow passage;
- a display configured to display information;
- and
- a controller including instructions stored in non-transitory memory that, when executed, cause the controller to:
- control the one or more valves to provide a first flow of the first gas having a first oxygen concentration through the inspiratory flow passage;
- detecting a first voltage output by the oxygen sensor during the first flow;
- control the one or more valves to provide a second flow of the second gas having a second oxygen concentration through the inspiratory flow passage;
- detecting a second voltage output by the oxygen sensor during the second flow;
- and
- monitor depletion of the oxygen sensor by tracking the output voltage recorded during the calibration routine over time by extrapolating an end of life date of the oxygen sensor based on a difference between the first voltage and the second voltage;
- control the display to output a lower priority oxygen sensor replacement notification based on the extrapolated end-of-life date being greater than a threshold duration;
- and control the display to output a higher priority oxygen sensor replacement notification responsive to the extrapolated end-of-life date being less than the threshold duration.
11 more elements
Dependencies are inferred from the claim text.