Predictive infusion device operations and related methods and systems
Infusion systems, infusion devices, and related operating methods are provided. An exemplary method of operating an infusion device capable of delivering fluid to a user involves determining a current value for a physiological condition of the user influenced by the fluid violates a first threshold value, determining a predicted value for the physiological condition of the user violates a second threshold value, and automatically altering operation of the infusion device to modify delivery of the fluid to the user after determining the predicted value violates the second threshold value when the current value violates the first threshold value.
1. A system for fluid delivery, the system comprising:
one or more processors; and
one or more processor-readable storage media storing instructions which, when executed by the one or more processors, cause performance of:
verifying that a refractory time period has elapsed after enabling operation of a motor operable to deliver fluid to a body of a user; and
suspending operation of the motor after verifying that the refractory time period has elapsed, and in response to determining a current measurement value for a physiological condition in the body of the user is less than a suspend enable threshold value and a predicted value for the physiological condition of the user is less than a predictive suspend threshold value.
2. The system of claim 1 , wherein the one or more processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
enabling operation of the motor in response to determining the current measurement value is greater than a resume enable threshold value and the predicted value is greater than a predictive resume threshold value.
3. The system of claim 1 , wherein the one or more processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
determining the refractory time period based on responsiveness of the user.
4. The system of claim 1 , wherein the one or more processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
verifying that a minimum suspension time period has elapsed after suspending operation of the motor prior to enabling operation of the motor.
5. The system of claim 1 , wherein the one or more processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
obtaining a suspend protection threshold value; and
determining the predictive suspend threshold value based at least in part on the suspend protection threshold value.
6. The system of claim 5 , wherein the one or more processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
determining a resume enable threshold value based at least in part on the suspend protection threshold value; and
enabling operation of the motor to deliver the fluid to the user after suspending operation of the motor when a subsequent measurement value is greater than the resume enable threshold value and a subsequent predicted value is greater than a predictive resume threshold value, and
wherein the predictive resume threshold value is greater than the resume enable threshold value.
7. The system of claim 1 , wherein the fluid comprises insulin, and wherein the one or more processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
determining a current insulin on board for the user; and
enabling operation of the motor to deliver the fluid to the user after suspending operation of the motor when the current insulin on board is less than a threshold insulin on board.
8. The system of claim 1 , wherein the one or more processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
determining the predicted value for the physiological condition of the user at a time after the current measurement value is determined based at least in part on the current measurement value.
9. One or more non-transitory processor-readable storage media storing instructions which, when executed by one or more processors, cause performance of:
verifying that a refractory time period has elapsed after enabling operation of a motor operable to deliver fluid to a body of a user; and
suspending operation of the motor after verifying that the refractory time period has elapsed, and in response to determining a current measurement value for a physiological condition in the body of the user is less than a suspend enable threshold value and a predicted value for the physiological condition of the user is less than a predictive suspend threshold value.
10. The one or more non-transitory processor-readable storage media of claim 9 , wherein the one or more non-transitory processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
enabling operation of the motor in response to determining the current measurement value is greater than a resume enable threshold value and the predicted value is greater than a predictive resume threshold value.
11. The one or more non-transitory processor-readable storage media of claim 9 , wherein the one or more non-transitory processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
determining the refractory time period based on responsiveness of the user.
12. The one or more non-transitory processor-readable storage media of claim 9 , wherein the one or more non-transitory processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
verifying that a minimum suspension time period has elapsed after suspending operation of the motor prior to enabling operation of the motor.
13. The one or more non-transitory processor-readable storage media of claim 9 , wherein the one or more non-transitory processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
obtaining a suspend protection threshold value; and
determining the predictive suspend threshold value based at least in part on the suspend protection threshold value.
14. The one or more non-transitory processor-readable storage media of claim 13 , wherein the one or more non-transitory processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
determining a resume enable threshold value based at least in part on the suspend protection threshold value; and
enabling operation of the motor to deliver the fluid to the user after suspending operation of the motor when a subsequent measurement value is greater than the resume enable threshold value and a subsequent predicted value is greater than a predictive resume threshold value, and
wherein the predictive resume threshold value is greater than the resume enable threshold value.
15. The one or more non-transitory processor-readable storage media of claim 9 , wherein the fluid comprises insulin, and wherein the one or more non-transitory processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
determining a current insulin on board for the user; and
enabling operation of the motor to deliver the fluid to the user after suspending operation of the motor when the current insulin on board is less than a threshold insulin on board.
16. The one or more non-transitory processor-readable storage media of claim 9 , wherein the one or more non-transitory processor-readable storage media further store instructions, which, when executed by the one or more processors, cause performance of:
determining the predicted value for the physiological condition of the user at a time after the current measurement value is determined based at least in part on the current measurement value.
17. A processor-implemented method for fluid delivery, the method comprising
verifying that a refractory time period has elapsed after enabling operation of a motor operable to deliver fluid to a body of a user; and
suspending operation of the motor after verifying that the refractory time period has elapsed, and in response to determining a current measurement value for a physiological condition in the body of the user is less than a suspend enable threshold value and a predicted value for the physiological condition of the user is less than a predictive suspend threshold value.
18. The method of claim 17 , further comprising:
enabling operation of the motor in response to determining the current measurement value is greater than a resume enable threshold value and the predicted value is greater than a predictive resume threshold value.
19. The method of claim 17 , further comprising:
determining the refractory time period based on responsiveness of the user.
20. The method of 17 , further comprising:
verifying that a minimum suspension time period has elapsed after suspending operation of the motor prior to enabling operation of the motor.