Patent ID: 9320471
Filing Date: 2016-04-26
CPC Classification: A61B,A61M,G16H,G16Z

Claim Text:
1. An infusion system for infusing a fluid into the body of a patient, the system comprising: a sensor system that includes a sensor for monitoring blood glucose concentration of a patient, and produces at least one sensor signal, which is representative of the blood glucose concentration of the patient, and wherein the at least one sensor signal is used to generate at least one sensor signal input; a controller, wherein the controller uses the at least one sensor signal input and a derivative predicted algorithm to determine at least one sensor-derived blood glucose trend, and wherein the at least one sensor-derived blood glucose trend is used to determine blood glucose levels at a predetermined time in the future, wherein 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, wherein the first derivative of the sensor current sample is calculated from a slope of the sensor current sample versus time using a Savitzky-Golay finite impulse response filter; and a delivery system that infuses a fluid into the patient, wherein operation of the delivery system is affected by commands from the controller and the patient, wherein the controller suspends fluid delivery if the at least one sensor-derived trend yields at least one blood glucose level reading that is below a predefined low shutoff threshold.