Patent ID: 7547281

Claim:
An infusion system for infusing a fluid into the body of a patient, the infusion system comprising: at least one sensor for monitoring blood glucose concentration of the patient, wherein the sensor produces at least one sensor signal input; and an infusion device for delivering fluid to the patient, wherein the infusion device uses the at least one sensor signal input and a derivative predicted algorithm to determine future blood glucose levels, the derivative predicted algorithm calculates a first derivative of a sensor current sample from the at least one sensor signal input at time period n, and then calculates a first derivative of a sensor glucose value from the at least one sensor signal input using the first derivative of the sensor current sample to determine future blood glucose levels, the infusion device is capable of automatically suspending and resuming fluid delivery based on future blood glucose levels and the patient's predefined low shutoff threshold, and the infusion device recommends more fluid delivery based on a positive derivative from the derivative predicted algorithm, and the infusion device recommends less fluid delivery based on a negative derivative from the derivative predicted algorithm.