Patent ID: 8348886

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