Systems and methods for predicting ambient temperature in a fluid analyte meter

• US 8,649,997 B2
• Filed: 10/02/2009
• Issued: 02/11/2014
• Est. Priority Date: 10/03/2008
• Status: Active Grant

• Current Assignee: Ascensia Diabetes Care Holdings AG (PHC Holdings Corporation)
• Original Assignee: Bayer Healthcare LLC (Bayer AG)
• Inventors: Farrell, John, Lieber, Harris, Sun, Hoi-Cheong Steve, Wu, Mu, Chen, Jun, Gofman, Igor, Reynolds, Jeffery S., Wang, Xin, Stefkovic, Gregory, Harrison, Bern
• Primary Examiner(s): TSAI, CAROL S W
• Application Number:
  US13/122,098
• Publication Number:
  US 20110191059A1
• Time in Patent Office: 1,593 Days
• Field of Search: 702/130, 73/614.6, 731/133.4, 340/636.2, 340/573.1, 340/603, 340/636.1, 340/365, 600/300, 600/549, 600/365, 600/347, 128/898
• US Class Current: 702/130
• CPC Class Codes: A61B 2562/0295 Strip shaped analyte sensors for apparatus classified in A61B5/145 or A61B5/157 disposable multilayered or laminated electrodes G01N27/307; details of handling chemical test elements G01N33/4875
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: G01K 7/42 Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature
• CPC Class Codes: G01K 7/427 Temperature calculation based on spatial modeling, e.g. spatial inter- or extrapolation
• CPC Class Codes: G01N 33/48785 Electrical and electronic details of measuring devices for physical analysis of liquid biological material not specific to a particular test method, e.g. user interface or power supply

Abstract

A system for a meter configured to determine an analyte concentration of a fluid sample includes a housing and a temperature sensor disposed within the housing. The system also includes a processor configured to receive temperature data from the temperature sensor upon the meter entering one of a charge state and a discharge state. The processor is further configured to predict a temperature value that approximates the ambient temperature outside of the housing. The predicted temperature value is based on historical temperature data received from the temperature sensor such that the predicted temperature value remains constant if a recently received temperature value remains within predetermined upper and lower temperature thresholds and the recently received temperature value exceeds the at least one predicted temperature value.

Claims

1. A meter configured to predict a temperature value associated with an analyte concentration determination of a fluid sample, the meter comprising:

a housing defining an interior and an exterior of the meter;

a temperature sensor disposed within the interior defined by the housing;

a processor disposed within the interior defined by the housing, the processor configured to determine a new predicted temperature value that approximates an ambient temperature for the exterior defined by the housing, the new predicted temperature value based on a first stored prior predicted temperature value and received prior temperature data that is at least partially associated with the temperature sensor such that the new predicted temperature value is set equal to the first stored prior predicted temperature value if recently received prior temperature data from the temperature sensor represents a measured temperature value that (i) is within predetermined upper and lower temperature thresholds, and (ii) exceeds the first stored prior predicted temperature value.

2. The meter of claim 1, wherein the processor receives temperature data obtained from the temperature sensor at predetermined periodic intervals.

3. The meter of claim 1, wherein the predetermined upper threshold is based on a second stored prior predicted temperature value plus a predetermined value.

4. The meter of claim 1, wherein the predetermined lower threshold is based on a second stored prior predicted temperature value minus a predetermined value.

5. The meter of claim 1, wherein the housing forms a sample port therein, and wherein the meter enters the discharge state upon a strip being inserted into the sample port.

6. The meter of claim 1, wherein the new predicted temperature value is set to equal the measured temperature value if the measured temperature value is outside the predetermined upper and lower temperature thresholds.

7. The meter of claim 1, wherein the analyte concentration of the fluid sample is determined based on the new predicted temperature value.

8. The meter of claim 1, further comprising a display disposed on the housing, the display operable to display the analyte concentration of a fluid sample.

9. The meter of claim 1, further comprising a battery compartment disposed within the interior defined by the housing, the battery compartment configured to store a rechargeable battery that provides power to the meter.

10. The meter of claim 1, wherein an offset value is applied to the new predicted temperature value prior to determining the analyte concentration of the fluid sample.

11. The meter of claim 6, wherein the new predicted temperature value is set to equal the measured temperature value if the measured temperature value is less than the first stored prior predicted temperature value.

12. A meter configured to predict a temperature value associated with an analyte concentration determination of a fluid sample, the meter comprising:

a housing having a display thereon, the display operative to display the analyte concentration of the fluid sample;

a temperature sensor disposed within the housing;

a battery compartment disposed within the housing, the battery compartment configured to store a rechargeable battery operative to power the meter during a battery charge state and a battery discharge state;

a processor configured to receive temperature data obtained during the battery charge state, the received temperature data at least partially associated with the temperature sensor, the processor further configured to predict an ambient temperature external to the housing based on the received temperature data and an estimate of heating of the meter due to heat generated during the battery charge state, the estimate of heating associated with a variable battery charge current.

13. The meter of claim 12, wherein the estimate of heating further includes determining an estimate heat dissipation of the meter.

14. The meter of claim 13, wherein the estimate of heat dissipation is based on an initial temperature value received at the commencement of charging.

15. The meter of claim 13, where the estimate of heat dissipation is based on an end temperature value received at the end of charging.

16. The meter of claim 12, wherein the temperature sensor is disposed near a sample port located on the housing.

17. A method for predicting a temperature value in a meter for determining an analyte concentration of a fluid sample, the method comprising:

receiving temperature data obtained from one or more temperature sensors;

storing the temperature data in one or more memories associated with a processor;

upon the meter entering at least one of a charge state or a discharge state, predicting via the processor a new temperature value that approximates an ambient temperature outside of a housing associated with the meter, the predicted temperature value based on a first stored prior predicted temperature value and the received temperature data,

wherein the predicted new temperature value is equal to one of the following;

(i) the first stored prior predicted temperature value if recently received temperature data represents a measured temperature value that is within predetermined upper and lower temperature thresholds and if the measured temperature value exceeds the first stored prior predicted temperature value,

(ii) the measured temperature value if the measured temperature value is outside the predetermined upper and lower temperature thresholds, and

(iii) the measured temperature value if the measured temperature value is less than the first stored prior predicted temperature value.

18. The method of claim 17, wherein the processor receives temperature data obtained from the one or more temperature sensors at predetermined periodic intervals.

19. The method of claim 17, wherein the predetermined upper threshold is based on a second stored prior predicted temperature value plus a predetermined value.

20. The method of claim 17, wherein the predetermined lower threshold is based on a second stored prior predicted temperature value minus a predetermined value.

21. The method of claim 17, wherein an offset value is applied to the predicted new temperature value prior to determining the analyte concentration of the fluid sample.

22. The method of claim 17, wherein the housing forms a sample port therein, and wherein the meter enters the discharge state upon a strip being inserted into the sample port.