Infusion devices and related methods and systems for regulating insulin on board
First Claim
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1. A method of operating an infusion device operable to deliver fluid to a body of a user, the fluid influencing a physiological condition in the body, the method comprising:
- automatically suspending operation of the infusion device to deliver the fluid to the user based at least in part on a current measurement value for the physiological condition of the user;
determining a current amount of active fluid in the body of the user;
determining a steady state threshold value for the fluid that is active in the body of the user based on a basal infusion rate;
after automatically suspending operation of the infusion device, when the current amount of active fluid is less than the steady state threshold value, automatically resuming operation of the infusion device to deliver the fluid to the user to regulate the current amount of active fluid to the steady state threshold value based on a difference between the current amount of active fluid and the steady state threshold value when the current measurement value for the physiological condition of the user is less than a threshold value for the physiological condition of the user; and
automatically suspending the delivery of the fluid when the current amount is greater than the steady state threshold value.
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Abstract
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 amount of active fluid in the body of the user, determining a threshold amount of active fluid in the body of the user, and automatically altering operation of the infusion device to modify delivery of the fluid to the user based on a relationship between the current amount and the threshold amount.
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Citations
16 Claims
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1. A method of operating an infusion device operable to deliver fluid to a body of a user, the fluid influencing a physiological condition in the body, the method comprising:
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automatically suspending operation of the infusion device to deliver the fluid to the user based at least in part on a current measurement value for the physiological condition of the user; determining a current amount of active fluid in the body of the user; determining a steady state threshold value for the fluid that is active in the body of the user based on a basal infusion rate; after automatically suspending operation of the infusion device, when the current amount of active fluid is less than the steady state threshold value, automatically resuming operation of the infusion device to deliver the fluid to the user to regulate the current amount of active fluid to the steady state threshold value based on a difference between the current amount of active fluid and the steady state threshold value when the current measurement value for the physiological condition of the user is less than a threshold value for the physiological condition of the user; and automatically suspending the delivery of the fluid when the current amount is greater than the steady state threshold value. - View Dependent Claims (2, 3, 4, 5, 8)
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6. A method of operating an infusion device operable to deliver fluid to a body of a user, the fluid influencing a physiological condition in the body, the method comprising:
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automatically suspending operation of the infusion device to deliver the fluid to the user based at least in part on a current measurement value for the physiological condition of the user; determining a current amount of active fluid in the body of the user; determining a minimum threshold amount of active fluid for the user; after automatically suspending operation of the infusion device, when the current amount of active fluid is less than the minimum threshold amount, automatically resuming operation of the infusion device to deliver the fluid to the user to regulate the current amount of active fluid to the minimum threshold amount of active fluid based on a difference between the current amount of active fluid to the minimum threshold amount of active fluid when the current measurement value for the physiological condition of the user is less than a threshold value for the physiological condition of the user; and automatically suspending the delivery of the fluid upon transitioning from a closed-loop mode regulating the physiological condition of the user to a target value to an open-loop mode when the current amount is greater than the minimum threshold amount. - View Dependent Claims (7)
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9. A method of operating an infusion device operable to deliver insulin to a body of a user, the method comprising:
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automatically suspending operation of a motor of the infusion device based at least in part on a current glucose measurement value for the user; identifying a minimum insulin on board for the user; identifying a current insulin on board for the user; generating an insulin on board delivery command configured to regulate the current insulin on board to the minimum insulin on board based on a difference between the current insulin on board and the minimum insulin on board; prior to operating the infusion device in accordance with the insulin on board delivery command, determining the current glucose measurement value for the user is greater than a resume enable threshold value prior to automatically enabling operation of the motor in response to determining the current insulin on board is less than the minimum insulin on board; and operating the infusion device in accordance with the insulin on board delivery command when a closed-loop delivery command generated based on a difference between the current glucose measurement value for the user and a target glucose value for the user is less than or equal to zero. - View Dependent Claims (10, 11, 15, 16)
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12. A method of operating an infusion device operable to deliver fluid to a body of a user, the fluid influencing a physiological condition in the body, the infusion device comprising a motor operable to deliver the fluid to the body of the user and a control module coupled to the motor, the method comprising:
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operating, by the control module, the motor to deliver the fluid based on a difference between a current measurement value for the physiological condition and a target value for the physiological condition when the current measurement value is greater than the target value; automatically suspending operation of the infusion device to deliver the fluid to the user based at least in part on the current measurement value; determining a current amount of active fluid in the body of the user; determining a minimum threshold amount of active fluid for the user; and after automatically suspending operation of the infusion device, when the current amount of active fluid is less than the minimum threshold amount, automatically resuming operation of the infusion device to deliver the fluid to the user to regulate the current amount of active fluid to the minimum threshold amount of active fluid based on a difference between the current amount of active fluid to the minimum threshold amount of active fluid when the current measurement value for the physiological condition of the user is less than a threshold value for the physiological condition of the user, wherein automatically resuming operation of the infusion device to modify delivery of the fluid to the user based on a relationship between the current amount and the minimum threshold comprises; operating, by the control module, the motor to deliver the fluid to regulate the current amount of the active fluid in the body of the user to the minimum threshold amount for the active fluid in the body of the user when the current amount is less than the minimum threshold amount and the current measurement value is less than or equal to the target value; and suspending operation of the motor when the current amount is greater than an upper threshold amount and the current measurement value is less than or equal to the target value. - View Dependent Claims (13, 14)
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Specification