Calibration techniques for a continuous analyte sensor

• US 10,188,333 B2
• Filed: 08/17/2017
• Issued: 01/29/2019
• Est. Priority Date: 12/05/2003
• Status: Active Grant

• Current Assignee: DexCom Incorporated
• Original Assignee: DexCom Incorporated
• Inventors: Kamath, Apurv Ullas, Simpson, Peter C., Brauker, James H., Goode, Jr., Paul V.
• Primary Examiner(s): JANG, CHRISTIAN YONGKYUN
• Application Number:
  US15/680,053
• Publication Number:
  US 20170340253A1
• Time in Patent Office: 530 Days
• CPC Class Codes: A61B 2560/0223 of calibration, e.g. protocols for calibrating sensors
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/14865 invasive, e.g. introduced into the body by a catheter or needle or using implanted sensors
• CPC Class Codes: A61B 5/1495 Calibrating or testing of in-vivo probes
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal
• CPC Class Codes: A61B 5/742 using visual displays A61B5/339 takes precedence
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing

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.

Claims

1. A system for continuous glucose sensing, the system comprising:

an implantable continuous glucose sensor configured to generate sensor data associated with glucose concentration in a host; and

sensor electronics configured to;

apply a voltage to the implantable continuous glucose sensor at a first setting,

switch the voltage applied to the implantable continuous glucose sensor to a second setting, wherein the first setting is different from the second setting,

measure a signal response of the electrochemical glucose sensor responsive to a change in the voltage applied, wherein the signal response is associated with a sensitivity change of the implantable continuous glucose sensor,

calibrate the sensor data, wherein the calibrating accounts for the sensitivity change, and

generate at least one glucose concentration value based on the calibrated sensor data.

2. The system of claim 1, wherein the sensor electronics are further configured to calibrate the sensor data based on an external reference value.

3. The system of claim 1, wherein the signal response measurement is independent of an external reference value.

4. The system of claim 1, wherein the signal response measurement is performed by the implantable continuous glucose sensor.

5. The system of claim 1, wherein the signal response measurement utilizes at least one electrode of the implantable continuous glucose sensor.

6. The system of claim 1, wherein the sensor electronics are configured to request an external reference value in response to the measurement exceeding a threshold.

7. The system of claim 1, wherein the sensor electronics are configured to calibrate the sensor data at a frequency selected based on the signal response measurement.

8. The system of claim 1, wherein the sensor electronics are configured to calibrate the sensor data in response to the signal response measurement exceeding a threshold.

9. The system of claim 1, wherein the sensor electronics are configured to re-calibrate the sensor data based on the signal response measurement.

10. The system of claim 1, wherein the sensor electronics are configured to determine a sensor stability based on the signal response measurement.

11. The system of claim 10, wherein the sensor electronics are configured to selectively display the sensor data based on the determined sensor stability.