System for regulating the concentration of glucose in the blood of a person

A system for regulating the concentration of glucose in the blood of a person, comprising:

• a device for selectively supplying insulin and glucagon;
• at least two infusion sets connectable to said device for infusing the insulin and glucagon to said person;
• at least one sensor for measuring a glucose concentration in the blood of said person;
• and
• a controller for controlling said device such that a certain amount of insulin and glucagon is supplied per time unit and thereby infused into the body of the person via a respective infusion set, wherein said certain amount is chosen in accordance with the measured glucose concentration as prescribed by an insulin injection curve and a glucagon injection curve which prescribes the amount of insulin and glucagon, respectively, to be supplied per measured glucose concentration,
• wherein said controller is further arranged to determine if glucagon is supplied to said person in a chosen time frame, and wherein the controller is arranged to re-assess and optionally adjust the insulin injection curve based on the determination if glucagon is supplied to said person in said chosen time frame.