System and methods for processing analyte sensor data for sensor calibration
Systems and methods for processing sensor analyte data are disclosed, including initiating calibration, updating calibration, evaluating clinical acceptability of reference and sensor analyte data, and evaluating the quality of sensor calibration. The sensor can be calibrated using a calibration set of one or more matched sensor and reference analyte data pairs. Reference data resulting from benchtop testing an analyte sensor prior to its insertion can be used to provide initial calibration of the sensor data. Reference data from a short term continuous analyte sensor implanted in a user can be used to initially calibrate or update sensor data from a long term continuous analyte sensor.
1. A method of making a glucose concentration measuring system comprising:
measuring glucose sensitivity characteristics of a sample set of transcutaneous glucose sensors;
manufacturing at least one transcutaneous glucose sensor, wherein the at least one transcutaneous glucose sensor comprises:
an in vivo portion configured for insertion and existence within a living body of a host during sensor use; and
an ex vivo portion configured to remain outside the living body of the host during sensor use, wherein the ex vivo portion is configured to operably connect to sensor electronics via contacts during sensor use;
assigning information associated with a sensor sensitivity to the at least one transcutaneous glucose sensor based at least in part on the measurements of glucose sensitivity characteristics of the sample set of transcutaneous glucose sensors;
storing the information associated with the sensor sensitivity in the sensor electronics;
configuring the sensor electronics to receive sensor input signals; and
configuring a processor to use the information associated with the sensor sensitivity to calibrate received sensor input signals after implantation of the at least one sensor in the host, without use of reference glucose concentration values from the host obtained after implantation of the at least one transcutaneous glucose sensor in the host.
2. The method of claim 1 , wherein the processor is incorporated in a receiver.
3. The method of claim 2 , wherein the receiver comprises a display screen.
4. The method of claim 1 , wherein the processor is incorporated in the sensor electronics.
5. The method of claim 1 , wherein the information associated with the sensor sensitivity is also based at least in part on an in vivo versus in vitro sensitivity relationship derived from clinical data obtained in at least one experiment using a plurality of transcutaneous glucose sensors.
6. The method of claim 1 , wherein measuring glucose sensitivity characteristics of the sample set of transcutaneous glucose sensors is performed in one or more reference solutions.