Calibration techniques for a continuous analyte sensor

Abstract

Disclosed herein are systems and methods for calibrating a continuous analyte sensor, such as a continuous glucose sensor. One such system utilizes one or more electrodes to measure an additional analyte. Such measurements may provide a baseline or sensitivity measurement for use in calibrating the sensor. Furthermore, baseline and/or sensitivity measurements may be used to trigger events such as digital filtering of data or suspending display of data.

1 . A method for processing data from an analyte sensor in a host, the method comprising:
 receiving sensor data from an analyte sensor, the sensor data indicative of an analyte concentration in a host;   measuring a change in sensitivity associated with the analyte sensor over a time period; and   calibrating the sensor data, using an electronic device, in response to the change in sensitivity measurement.   
     
     
         2 . The method of  claim 1 , wherein the measuring is independent of an external reference value. 
     
     
         3 . The method of  claim 1 , wherein the measuring is performed by the sensor. 
     
     
         4 . The method of  claim 1 , wherein the measuring utilizes one or more electrodes of the analyte sensor. 
     
     
         5 . The method of  claim 1 , wherein the measuring comprises measuring an auxiliary signal. 
     
     
         6 . The method of  claim 1 , wherein the measuring comprises measuring a constant, non-glucose analyte concentration. 
     
     
         7 . The method of  claim 1 , wherein the calibrating comprises requesting an external reference value in response to the measured change. 
     
     
         8 . The method of  claim 1 , wherein further calibrations are performed at a frequency selected based on the measured sensitivity change. 
     
     
         9 . The method of  claim 1 , wherein the calibrating is based on the measured change in sensitivity. 
     
     
         10 . The method of  claim 9 , wherein the calibrating is further based on an external reference value. 
     
     
         11 . The method of  claim 1 , wherein the calibrating comprises updating a previous calibration based on the measured change in sensitivity. 
     
     
         12 . The method of  claim 1 , wherein the calibrating comprises augmenting a previous calibration based on the measured change in sensitivity. 
     
     
         13 . The method of  claim 1 , further comprising determining a sensor stability based on the measured change in sensitivity. 
     
     
         14 . The method of  claim 13 , further comprising displaying sensor data, wherein a determination as to whether sensor data is to be displayed is based on the determined sensor stability. 
     
     
         15 . The method of  claim 1 , wherein the analyte sensor is a glucose sensor.