Systems and methods for compensating long term sensitivity drift of electrochemical gas sensors exposed to nitric oxide
DCFirst Claim
1. A method for delivering notifications of a calibration status for a sensor associated with a therapeutic gas delivery device, the method comprising:
- storing in memory a baseline calibration value, slope, and calibration schedule;
monitoring a patient intake of therapeutic gas with a sensor;
delivering, via a therapeutic gas delivery device, a predetermined dosage of therapeutic gas to the patient;
measuring a concentration of therapeutic gas from the delivered predetermined dosage;
retrieving, from memory, the baseline calibration value, slope and calibration schedule;
performing a calibration according to the calibration schedule, wherein the calibration includes exposing the sensor to a zero concentration of the therapeutic gas and adjusting the baseline calibration value according to a sensor output value during the calibration;
notifying a user, during the performance of the calibration, that the calibration is currently in effect, wherein the notifying includes displaying a notification that the measuring of therapeutic gas concentration is off-line; and
upon completion of the calibration, determining an actual concentration of therapeutic gas delivered in the predetermined dosage to compensate for sensor drift by adjusting the value of the measured concentration based on the adjusted baseline value and the slope.
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Abstract
Systems and methods for compensating long term sensitivity drift of catalytic type electrochemical gas sensors used in systems for delivering therapeutic nitric oxide (NO) gas to a patient by compensating for drift that may be specific to the sensors. In at least some instances, the long term sensitivity drift of catalytic type electrochemical gas sensors can be addressed using calibration schedules, which can factor in the absolute change in set dose of NO being delivered to the patient that can drive one or more baseline calibrations. The calibration schedules can reduce the amount of times the sensor goes offline. Systems and methods may factor in actions occurring at the delivery system and/or aspects of the surrounding environment, prior to performing a baseline calibration, and may postpone the calibration and/or rejected using the sensor'"'"'s output for the calibration.
22 Citations
16 Claims
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1. A method for delivering notifications of a calibration status for a sensor associated with a therapeutic gas delivery device, the method comprising:
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storing in memory a baseline calibration value, slope, and calibration schedule; monitoring a patient intake of therapeutic gas with a sensor; delivering, via a therapeutic gas delivery device, a predetermined dosage of therapeutic gas to the patient; measuring a concentration of therapeutic gas from the delivered predetermined dosage; retrieving, from memory, the baseline calibration value, slope and calibration schedule; performing a calibration according to the calibration schedule, wherein the calibration includes exposing the sensor to a zero concentration of the therapeutic gas and adjusting the baseline calibration value according to a sensor output value during the calibration; notifying a user, during the performance of the calibration, that the calibration is currently in effect, wherein the notifying includes displaying a notification that the measuring of therapeutic gas concentration is off-line; and upon completion of the calibration, determining an actual concentration of therapeutic gas delivered in the predetermined dosage to compensate for sensor drift by adjusting the value of the measured concentration based on the adjusted baseline value and the slope. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for delivering notifications of a calibration status for a sensor associated with a therapeutic gas delivery device including a display screen, the method comprising:
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storing in memory a baseline calibration value, slope, and calibration schedule; monitoring a patient intake of therapeutic gas with a sensor; delivering, via a therapeutic gas delivery device, a predetermined dosage of therapeutic gas to the patient; measuring a concentration of therapeutic gas from the delivered predetermined dosage; retrieving, from memory, the baseline calibration value, slope and calibration schedule; performing a calibration according to the calibration schedule, wherein the calibration includes exposing the sensor to a zero concentration of the therapeutic gas and adjusting the baseline calibration value according to a sensor output value during the calibration; notifying a user, during the performance of the calibration, that the calibration is currently in effect, wherein the notifying includes displaying a notification on the display screen that the measuring of therapeutic gas concentration is off-line and that an alarm associated with the sensor has been disabled; and upon completion of the calibration, determining an actual concentration of therapeutic gas delivered in the predetermined dosage to compensate for sensor drift by adjusting the value of the measured concentration based on the adjusted baseline value and the slope. - View Dependent Claims (13, 14, 15, 16)
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Specification