Analyte Monitoring Device and Methods of Use

Abstract

An analyte monitor includes a sensor, a sensor control unit, and a display unit. The sensor has, for example, a substrate, a recessed channel formed in the substrate, and conductive material disposed in the recessed channel to form a working electrode. The sensor control unit typically has a housing adapted for placement on skin and is adapted to receive a portion of an electrochemical sensor. The sensor control unit also includes two or more conductive contacts disposed on the housing and configured for coupling to two or more contact pads on the sensor. A transmitter is disposed in the housing and coupled to the plurality of conductive contacts for transmitting data obtained using the sensor. The display unit has a receiver for receiving data transmitted by the transmitter of the sensor control unit and a display coupled to the receiver for displaying an indication of a level of an analyte. The analyte monitor may also be part of a drug delivery system to alter the level of the analyte based on the data obtained using the sensor.

1 - 247 . (canceled) 
     
     
         248 . A method for calibration of a continuous glucose sensor, the method comprising:
 receiving a signal from a continuous glucose sensor;   evaluating a sensor performance during a sensor session by determining an amount of drift on the signal over a period of time, wherein determining the amount of drift comprises monitoring a change in calibration information; and   processing the signal based on the sensor performance.   
     
     
         249 . The method of  claim 248 , wherein the calibration information comprises one or more matched data pairs, a calibration set and/or a calibration line. 
     
     
         250 . The method of  claim 248 , wherein the processing comprises determining when to request reference data responsive to the sensor performance determined. 
     
     
         251 . The method of  claim 248 , wherein the processing comprises diagnosing a sensor condition. 
     
     
         252 . The method of  claim 248 , wherein the processing comprises controlling alarms indicative of at least one of hypoglycemia, hyperglycemia, predicted hypoglycemia, or predicted hyperglycemia based on the predictive accuracy. 
     
     
         253 . The method of  claim 248 , wherein the processing comprises controlling insulin delivery and/or insulin therapy instructions based on the predictive accuracy. 
     
     
         254 . The method of  claim 248 , wherein the processing comprises diagnosing a sensor condition based at least in part on the predictive accuracy. 
     
     
         255 . A system for processing continuous glucose sensor data, the system comprising:
 a continuous analyte sensor configured to continuously measure a concentration of an analyte in a host; and   a computer system configured to receive sensor data from the continuous analyte sensor, wherein the computer system is configured to evaluate a sensor performance during a sensor session and to process a signal from the sensor responsive to the evaluation, wherein the evaluation comprises monitoring calibration information to determine an amount of drift on the signal over a period of time.   
     
     
         256 . The system of  claim 255 , wherein the calibration information comprises one or more matched data pairs, a calibration set and/or a calibration line. 
     
     
         257 . The system of  claim 255 , wherein the computer system is configured to determine when to request reference data based on the sensor performance. 
     
     
         258 . The system of  claim 255 , wherein the computer system is configured to diagnose a sensor condition based on the sensor performance. 
     
     
         259 . The system of  claim 255 , wherein the computer system is configured to control an alarm indicative of at least one of hypoglycemia, hyperglycemia, predicted hypoglycemia, or predicted hyperglycemia based on the sensor performance. 
     
     
         260 . The system of  claim 255 , wherein the computer system is configured to control delivery and/or insulin therapy instructions based on the sensor performance. 
     
     
         261 . The system of  claim 255 , wherein the computer system is incorporated in a hand-held receiver device. 
     
     
         262 . The system of  claim 255 , wherein the computer system is incorporated in sensor electronics configured to be physically coupled to the continuous analyte sensor.