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 system for processing sensor data from an analyte sensor in a host, the system comprising:
 an analyte sensor configured to provide sensor data associated with an analyte concentration in a host; and   a processor module configured to calibrate the sensor data based on a measurement indicative of a change in sensitivity over a time period.   
     
     
         2 . The system of  claim 1 , wherein the processor module is further configured to calibrate the sensor data based on an external reference value. 
     
     
         3 . The system of  claim 1 , wherein the measurement is independent of an external reference value. 
     
     
         4 . The system of  claim 1 , wherein the measurement is performed by the analyte sensor. 
     
     
         5 . The system of  claim 1 , wherein the measurement utilizes one or more electrodes of the analyte sensor. 
     
     
         6 . The system of  claim 1 , wherein the measurement is based on an auxiliary signal. 
     
     
         7 . The system of  claim 1 , wherein the measurement is indicative of a constant non-glucose analyte concentration. 
     
     
         8 . The system of  claim 1 , wherein the processor module is configured to request an external reference value in response to the measurement exceeding a threshold. 
     
     
         9 . The system of  claim 1 , wherein the processor module is configured to calibrate the sensor data at a frequency selected based on the measurement. 
     
     
         10 . The system of  claim 1 , wherein the processor module is configured to calibrate the sensor data in response to the measurement exceeding a threshold. 
     
     
         11 . The system of  claim 1 , wherein the processor module is configured to re-calibrate the sensor data based on the measurement. 
     
     
         12 . The system of  claim 1 , wherein the processor module is configured to augment a previous calibration based on the measurement. 
     
     
         13 . The system of  claim 1 , wherein the processor module is configured to determine a sensor stability based on the measurement. 
     
     
         14 . The system of  claim 13 , wherein the processor module is configured to selectively display the sensor data based on the determined sensor stability. 
     
     
         15 . The system of  claim 1 , wherein the analyte sensor is a glucose sensor.