Regulating entry into a closed-loop operating mode of an insulin infusion system

A method of operating an insulin infusion device to deliver insulin to a body of a user, the method comprising:

• obtaining sensor calibration data for a glucose sensor that generates a sensor variable indicative of blood glucose of the user;
• identifying a most recent calibration factor from the sensor calibration data, the most recent calibration factor representing a first conversion value applicable to convert a first value of the sensor variable to a first blood glucose value;
• identifying a prior calibration factor from the sensor calibration data, the prior calibration factor representing a second conversion value applicable to convert a second value of the sensor variable to a second blood glucose value, and the prior calibration factor corresponding to an earlier time relative to the most recent calibration factor;
• and
• permitting entry into a closed-loop operating mode of the insulin infusion device only when the prior calibration factor falls within a designated window of time;
• and
• operating the insulin infusion device in the closed-loop operating mode to deliver insulin to the body of the user in a manner that is influenced by the most recent calibration factor.

A device comprising:

• a processor architecture comprising at least one processor device;
• and
• at least one memory element associated with the processor architecture, the at least one memory element storing processor-executable instructions that, when executed by the processor architecture, cause the processor architecture to:
• obtain sensor calibration data for a glucose sensor that generates a sensor variable indicative of blood glucose of a user;
• identify at least one of a prior calibration factor and a most recent calibration factor from the sensor calibration data, the most recent calibration factor representing a first conversion value applicable to convert a first value of the sensor variable to a first blood glucose value, the prior calibration factor representing a second conversion value applicable to convert a second value of the sensor variable to a second blood glucose value, and the prior calibration factor corresponding to an earlier time relative to the most recent calibration factor;
• and
• permit entry into a closed-loop operating mode of an insulin infusion device only when the at least one of the prior calibration factor and the most recent calibration factor from the sensor calibration data is greater than or equal to a minimum acceptable calibration factor value and less than or equal to a maximum acceptable calibration factor value, wherein the insulin infusion device operation in the closed-loop operating mode to deliver insulin to a body of the user is influenced by the most recent calibration factor.