Method and apparatus for providing data processing and control in a medical communication system

• US 20080312844A1
• Filed: 05/14/2008
• Published: 12/18/2008
• Est. Priority Date: 05/14/2007
• Status: Active Grant

• Current Assignee: Abbott Diabetes Care Incorporated (Abbott Laboratories Incorporated)
• Original Assignee: Abbott Diabetes Care Incorporated (Abbott Laboratories Incorporated)
• Inventors: Hayter, Gary, Feldman, Benjamin J., McGarraugh, Geoffrey V., Mazza, John C., Harper, Wesley Scott, Naegeli, Andrew H.
• Granted Patent: US 7,996,158 B2
• Time in Patent Office: Days
• US Class Current: 702/23
• CPC Class Codes: A61B 2560/0223 of calibration, e.g. protocols for calibrating sensors
• CPC Class Codes: A61B 2560/0252 using ambient temperature
• CPC Class Codes: A61B 2560/0276 Determining malfunction
• CPC Class Codes: A61B 5/002 Monitoring the patient using a local or closed circuit, e.g. in a room or building A61B5/0017 takes precedence
• 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

Abstract

Methods and apparatus for providing data processing and control for use in a medical communication system are provided.

Claims

1. A method, comprising:

performing a calibration routine associated with an in vivo analyte sensor based on a current calibration parameter;

retrieving a prior calibration parameter;

comparing the current calibration parameter and the retrieved prior calibration parameter; and

determining a stability status associated with the analyte sensor based at least in part on comparing the current calibration parameter and the retrieved prior calibration parameter.

2. The method of claim 1 wherein the analyte sensor is determined to be within a predetermined stability range based on the comparing step.

3. The method of claim 2 wherein the predetermined stability range is approximately 50 percent difference or less between the current calibration parameter and the retrieved prior calibration parameter.

4. The method of claim 2 wherein the predetermined stability range is approximately 25 percent difference or less between the current calibration parameter and the retrieved prior calibration parameter.

5. The method of claim 1 wherein the analyte sensor is determined to be outside a predetermined stability range based on the comparing step.

6. The method of claim 5 wherein the predetermined stability range is approximately 50 percent difference or less between the current calibration parameter and the retrieved prior calibration parameter.

7. The method of claim 5 wherein the predetermined stability range is approximately 25 percent difference or less between the current calibration parameter and the retrieved prior calibration parameter.

8. The method of claim 1 wherein the current calibration parameter and the prior calibration parameter are each associated with a respective sensitivity of the analyte sensor.

9. The method of claim 1 wherein the performed calibration routine and a prior calibration routine associated with the prior calibration parameter are based on a predetermined calibration schedule for the analyte sensor.

10. The method of claim 1 wherein when the current calibration parameter compared with the retrieved prior calibration parameter is within a predetermined range, the determined stability status indicates a stable status associated with the analyte sensor.

11. The method of claim 1 wherein when the current calibration parameter compared with the retrieved prior calibration parameter is not within a predetermined range, the determined stability status indicates an unstable status associated with the analyte sensor.

12. The method of claim 11 including performing a further calibration routine.

13. The method of claim 1 wherein the prior calibration parameter is associated with a prior calibration routine preceding the calibration routine for the analyte sensor.

14. The method of claim 13 wherein the prior calibration routine and the calibration routine are performed based on a predetermined calibration schedule to calibrate the analyte sensor during a predetermined time period when the analyte sensor is in continuous contact with an analyte of a user.

15. The method of claim 1 wherein performing the calibration routine includes receiving a current blood glucose data.

16. The method of claim 1 wherein the analyte sensor is a continuous glucose sensor.

17. The method of claim 1 wherein the analyte sensor is an electrochemical continuous glucose sensor.

18. An apparatus, comprising:

a data storage unit; and

a processing unit coupled to the data storage unit, and configured to perform a calibration routine associated with an in vivo analyte sensor based on a current calibration parameter, retrieve a prior calibration parameter from the data storage unit, compare the current calibration parameter and the retrieved prior calibration parameter, and determine a stability status associated with the analyte sensor based at least in part on comparing the current calibration parameter and the retrieved prior calibration parameter.

19. The apparatus of claim 18 wherein the processing unit determines the analyte sensor stability level based on a predetermined stability range.

20. The apparatus of claim 19 wherein the predetermined stability range is approximately 50 percent difference or less between the current calibration parameter and the retrieved prior calibration parameter.

21. The apparatus of claim 19 wherein the predetermined stability range is approximately 25 percent difference or less between the current calibration parameter and the retrieved prior calibration parameter.

22. The apparatus of claim 18 wherein the current calibration parameter and the prior calibration parameter are each associated with a respective sensitivity of the analyte sensor.

23. The apparatus of claim 18 wherein the processing unit performs the calibration routine and a prior calibration routine associated with the prior calibration parameter based on a predetermined calibration schedule for the analyte sensor during the time period that the analyte sensor is in substantially continuous fluid contact with an analyte of a user.

24. The apparatus of claim 18 wherein when the processing unit determines the current calibration parameter compared with the retrieved prior calibration parameter is within a predetermined range, the processing unit determines the stability status indicating a stable status associated with the analyte sensor.

25. The apparatus of claim 18 wherein when the processing unit determines the current calibration parameter compared with the retrieved prior calibration parameter is not within a predetermined range, the processing unit determines the stability status indicating an unstable status associated with the analyte sensor.

26. The apparatus of claim 25 wherein when the unstable status of the analyte sensor is indicated, the processing unit is configured to perform a further calibration routine.

27. The apparatus of claim 18 wherein the calibration routine includes processing one or more signals from the analyte sensor based on a blood glucose measurement.

28. The apparatus of claim 27 including a blood glucose meter to provide the blood glucose measurement.

29. The apparatus of claim 28 wherein the processing unit is in signal communication with the blood glucose meter to receive the blood glucose measurement.

30. The apparatus of claim 27 including a housing, the processing unit and the blood glucose meter provided substantially within the housing.