Patent ID: 11944755
Assignee: GE PRECISION HEALTHCARE LLC
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A

Claim 7:
8. 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.