Rapid charging and power management of a battery-powered fluid analyte meter

• US 9,312,720 B2
• Filed: 03/07/2013
• Issued: 04/12/2016
• Est. Priority Date: 12/10/2007
• Status: Active Grant

• Current Assignee: Ascensia Diabetes Care Holdings AG (PHC Holdings Corporation)
• Original Assignee: Ascensia Diabetes Care Holdings AG (PHC Holdings Corporation)
• Inventors: Gofman, Igor, Chen, Jun
• Primary Examiner(s): La, Anh V
• Application Number:
  US13/789,104
• Publication Number:
  US 20130257352A1
• Time in Patent Office: 1,132 Days
• Field of Search: 340/636.2, 340/636.1, 340603-605, 340/573.1, 340/573.5, 600/364, 600/309, 600/365, 320/132, 320/155, 320/150
• US Class Current: 1/1
• CPC Class Codes: A61B 2560/0214 of power generation or supply
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• 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
• CPC Class Codes: G01R 31/3646 for indicating electrical conditions or variables, e.g. visual or audible indicators
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements
• CPC Class Codes: H02J 2310/23 The load being a medical device, a medical implant, or a life supporting device
• CPC Class Codes: H02J 7/0071 with a programmable schedule
• CPC Class Codes: H02J 7/00714 in response to battery charging or discharging current
• CPC Class Codes: H02J 7/007192 in response to temperature
• CPC Class Codes: H02J 7/007194 of the battery

Abstract

A system and method is described for rapid charging and power management of a battery for a meter. A charger component is operably associated with the meter and is capable of executing a rapid charge algorithm for a rechargeable battery. The algorithm includes monitoring for a connection to an external power source and implementing a charging routine of a battery at a first charge rate and then at a second charge rate. The second charge rate is lower than the first charge rate. A temperature rise in the rechargeable battery due to the first charge rate has a negligible heat transfer effect on the fluid sample. The meter can also include a power switch for controlling current flow to a battery fuel gauge. The power switch is open when the meter enters into a sleep mode. The state of battery charge is determined after the meter exits the sleep mode.

Claims

1. A battery-powered meter adapted to determine an analyte concentration of a fluid sample, the meter comprising:

a housing defining a volume for receiving a rechargeable battery and further defining a port sized to receive at least a portion of a test sensor; and

one or more processors disposed within said housing, said one or more processors configured to implement a charge process associated with said rechargeable battery, said charge process comprising the acts of;

(i) monitoring for a connection to an external power source; and

(ii) in response to receiving identifying information of said connection to said external power source, implementing a charging routine for rapid charging of said battery at a first charge rate until a first predetermined event occurs and thereafter charging said battery at a second charge rate that is lower than said first charge rate,

wherein implementation of said charging routine minimizes temperature rise in said meter such that said temperature rise is negligible to a temperature-sensitive analyte concentration test for which said meter is configured.

2. The battery-powered meter of claim 1, wherein said analyte concentration is a blood glucose concentration.

3. The battery-powered meter of claim 1, wherein said first charge rate is about 1C.

4. The battery-powered meter of claim 1, wherein said second charge rate is less than 1C.

5. The battery-powered meter of claim 1, wherein said second charge rate is from about 0.5C to about 0.6C.

6. The battery-powered meter of claim 1, wherein said first predetermined event is a lapsing of a predetermined time period.

7. The battery-powered meter of claim 6, wherein said predetermined time period is about one minute or less.

8. The battery-powered meter of claim 1, wherein at least one of said one or more processors comprises an integrated circuit.

9. The battery-powered meter of claim 1, wherein said external power source is a port on a computing device.

10. The battery-power meter of claim 1, wherein said housing has a footprint area of less than about nine square inches.

11. The battery-power meter of claim 1, wherein said housing has a long dimension of less than approximately three inches.

12. The battery-powered meter of claim 1, further comprising implementing a human-perceivable signal following said first predetermined event.

13. A battery-powered meter adapted to determine an analyte concentration of a fluid sample, the meter comprising:

a housing defining a volume for receiving a rechargeable battery and further defining a port sized to receive at least a portion of a test sensor; and

one or more processors disposed within said housing, said one or more processors configured to implement a charge process associated with said rechargeable battery, said charge process comprising the acts of;

(i) monitoring for a connection to an external power source; and

(ii) in response to receiving identifying information of said connection to said external power source, implementing a charging routine for rapid charging of said battery at a first charge rate until a first predetermined event occurs and thereafter charging said battery at a second charge rate that is lower than said first charge rate,

wherein implementation of said charge routine is in accordance with temperature rise criteria for said meter in view of particular temperature sensitive analyte concentration tests for which said meter is configured.

14. The battery-powered meter of claim 13, wherein said analyte concentration is a blood glucose concentration.

15. The battery-powered meter of claim 13, wherein said second charge rate is less than 1C, and said first predetermined event is the lapsing of about one minute or less.

16. The battery-powered meter of claim 13, wherein said charge process further comprises:

(iii) in response to a second predetermined event during said charging of said battery at a second charge rate, implementing a termination charge routine that charges said battery at a third charge rate until another predetermined event occurs, said third charge rate being lower than said second charge rate.

17. The battery-powered meter of claim 16, wherein said third charge rate is continuously decreasing.

18. A battery-powered meter adapted to determine an analyte concentration of a fluid sample, the meter comprising:

a housing defining a volume for receiving a rechargeable battery and further defining a port sized for receiving at least a portion of a test sensor; and

one or more processors disposed within said housing, at least one of said one or more processors configured to implement a charge process associated with said rechargeable battery, said charge process comprising the acts of;

(i) monitoring said rechargeable battery for a remaining battery charge value that is less than a predetermined charge value;

(ii) in response to receiving identifying information that said remaining battery charge value is less than the predetermined charge value, transmitting a signal for implementing a human-perceivable alert;

(iii) monitoring for a connection to an external power source; and

(iv) in response to receiving identifying information of said connection to said external power source, implementing a rapid charge routine for charging said rechargeable battery for less than about one minute at a charge rate of about 2C or less,

wherein a determination of analyte concentration by said meter has an approximated energy draw, and wherein said implementation of said rapid charge routine configured to provide energy to said rechargeable battery to allow one or more analyte concentration determinations to be completed based on said approximated energy draw.

19. The battery-powered meter of claim 18, wherein said predetermined charge value is a charge value associated with enough energy to complete two or fewer analyte concentration determinations based on said approximated energy draw.

20. The battery-powered meter of claim 18, wherein said charge routine provides energy to said battery to complete approximately five analyte concentration determinations based on said approximated energy draw.