Method and device for providing offset model based calibration for analyte sensor

• US 8,532,935 B2
• Filed: 07/16/2012
• Issued: 09/10/2013
• Est. Priority Date: 01/29/2009
• Status: Active Grant

• Current Assignee: Abbott Diabetes Care Incorporated (Abbott Laboratories Incorporated)
• Original Assignee: Abbott Diabetes Care Incorporated (Abbott Laboratories Incorporated)
• Inventors: Budiman, Erwin Satrya
• Primary Examiner(s): Brusca, John S
• Application Number:
  US13/550,515
• Publication Number:
  US 20120283960A1
• Time in Patent Office: 421 Days
• Field of Search: None
• US Class Current: 702/19
• 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: G16H 10/20 for electronic clinical trials or questionnaires
• CPC Class Codes: G16H 10/40 for data related to laboratory analysis, e.g. patient specimen analysis
• CPC Class Codes: G16H 40/63 for local operation
• CPC Class Codes: Y10T 436/144444 Glucose

Abstract

Methods and devices to detect analyte in body fluid are provided. Embodiments include processing sampled data from analyte sensor, determining a single, fixed, normal sensitivity value associated with the analyte sensor, estimating a windowed offset value associated with the analyte sensor for each available sampled data cluster, computing a time varying offset based on the estimated windowed offset value, and applying the time varying offset and the determined normal sensitivity value to the processed sampled data to estimate an analyte level for the sensor.

Claims

1. A method, comprising:

receiving, using one or more processors, sampled data associated with an analyte sensor;

estimating, using the one or more processors, a windowed offset value associated with the analyte sensor;

determining, using the one or more processors, a time varying offset based on the estimated windowed offset value; and

applying, using the one or more processors, the time varying offset to the received sampled data to estimate an analyte level.

2. The method of claim 1 further including performing retrospective lag correction of the sampled data.

3. The method of claim 1 further including smoothing the sampled data.

4. The method of claim 1 further including performing temperature correction to the sampled data.

5. The method of claim 1 further including determining a sensitivity value associated with the analyte sensor.

6. The method of claim 5 wherein determining the sensitivity value includes pairing the sampled data from the analyte sensor with one or more time corresponding reference measurement values.

7. The method of claim 5 further including applying the sensitivity value to the received sampled data.

8. An apparatus, comprising:

a data communication interface;

one or more processors operatively coupled to the data communication interface; and

a memory for storing instructions which, when executed by the one or more processors, causes the one or more processors to receive sampled data associated with an analyte sensor, estimate a windowed offset value associated with the analyte sensor, determine a time varying offset based on the estimated windowed offset value, and apply the time varying offset to the received sampled data to estimate an analyte level.

9. The apparatus of claim 8 wherein the memory for storing instructions which, when executed by the one or more processors, causes the one or more processors to perform retrospective lag correction of the sampled data.

10. The apparatus of claim 8 wherein the memory for storing instructions which, when executed by the one or more processors, causes the one or more processors to smooth the sampled data.

11. The apparatus of claim 8 wherein the memory for storing instructions which, when executed by the one or more processors, causes the one or more processors to perform temperature correction for the sampled data.

12. The apparatus of claim 8 wherein the memory for storing instructions which, when executed by the one or more processors, causes the one or more processors to determine a sensitivity value associated with the analyte sensor.

13. The apparatus of claim 12 wherein the memory for storing instructions which, when executed by the one or more processors, causes the one or more processors to pair the sampled data from the analyte sensor with one or more time corresponding reference measurement values.

14. The apparatus of claim 12 wherein the memory for storing instructions which, when executed by the one or more processors, causes the one or more processors to apply the sensitivity value to the received sampled data.

15. One or more storage devices having processor readable code embodied thereon, the processor readable code for programming one or more processors to estimate an analyte level, comprising:

receiving sampled data associated with an analyte sensor;

estimating a windowed offset value associated with the analyte sensor;

determining a time varying offset based on the estimated windowed offset value; and

applying the time varying offset to the received sampled data to estimate the analyte level.

16. The one or more storage devices of claim 15 further including processor readable code for programming the one or more processors to perform retrospective lag correction of the sampled data.

17. The one or more storage devices of claim 15 further including processor readable code for programming the one or more processors to smooth the sampled data.

18. The one or more storage devices of claim 15 further including processor readable code for programming the one or more processors to perform temperature correction to the sampled data.

19. The one or more storage devices of claim 15 further including processor readable code for programming the one or more processors to determine a sensitivity value associated with the analyte sensor.

20. The one or more storage devices of claim 19 further including processor readable code for programming the one or more processors to apply the sensitivity value to the received sampled data.