Apparatus and method for controlling insulin infusion with state variable feedback
First Claim
1. A method of infusing insulin into a body of a user, the method comprising:
- delivering a basal amount of insulin to the body of the user at a predetermined basal rate;
determining at least one state variable;
determining, based on the at least one state variable, an additional amount of insulin to be delivered to the body of the user;
infusing the determined additional amount of insulin to the body of the user; and
reducing the basal rate by said additional amount of insulin.
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Abstract
An infusion system, which may be a closed loop, or “semi-closed-loop”, infusion system, uses state variable feedback to control the rate at which fluid is infused into a user'"'"'s body. The closed loop system includes a sensor system, a controller, and a delivery system. The “semi-closed-loop” system further includes prompts that provide indications to the user prior to fluid delivery. The sensor system includes a sensor for monitoring a condition of the user and produces a sensor signal which is representative of the user'"'"'s condition. The delivery system infuses a fluid into the user at a rate dictated by the commands from the controller. The system may use three state variables, e.g., subcutaneous insulin concentration, plasma insulin concentration, and insulin effect, and corresponding gains, to calculate an additional amount of fluid to be infused with a bolus and to be removed from the basal delivery of the fluid.
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Citations
12 Claims
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1. A method of infusing insulin into a body of a user, the method comprising:
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delivering a basal amount of insulin to the body of the user at a predetermined basal rate; determining at least one state variable; determining, based on the at least one state variable, an additional amount of insulin to be delivered to the body of the user; infusing the determined additional amount of insulin to the body of the user; and reducing the basal rate by said additional amount of insulin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification