Patent ID: 8771222

Claim:
An apparatus for infusing insulin into a body of a user, the apparatus comprising: a housing; a pump inside the housing for delivering insulin into the body of the user; and at least one controller to control delivery of the insulin from the housing by the pump, wherein the at least one controller: controls delivery of a basal amount of insulin to the body of the user at a predetermined basal rate; determines a bolus amount of insulin to be delivered to the body of the user; determines at least one state variable, said at least one state variable being at least one of subcutaneous insulin concentration, plasma insulin concentration, and insulin effect; determines, based on the at least one state variable, an additional amount of insulin to be delivered to the body of the user with the bolus amount of insulin; controls delivery of the determined bolus amount of insulin and the determined additional amount of insulin to the user; and reduces the basal rate by the additional amount of insulin delivered with the bolus amount of insulin.