Ambulatory infusion device with variable energy storage testing and method for testing an energy storage

• US 8,476,868 B2
• Filed: 12/23/2010
• Issued: 07/02/2013
• Est. Priority Date: 12/28/2009
• Status: Active Grant

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Diagnostics International AG (Roche Holding AG)
• Inventors: Rufer, Thomas, Aeschlimann, Reto
• Primary Examiner(s): TSO, EDWARD H
• Application Number:
  US12/977,392
• Publication Number:
  US 20110279123A1
• Time in Patent Office: 922 Days
• Field of Search: 320/107, 320/114, 320/115, 320/166, 324/426, 324/427, 324/433, 607/5, 607/75
• US Class Current: 320/114
• CPC Class Codes: A61M 5/14 Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/14276 specially adapted for implantation
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence
• CPC Class Codes: A61M 5/5086 for indicating if defective, used, tampered with or unsterile
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC

Abstract

Included are embodiments of an ambulatory infusion device. Some embodiments include an energy storage for storing electrical energy utilized for powering the ambulatory infusion device. The energy storage may serve as a primary power source of the ambulatory infusion device. Also included is a dosing unit with an electrically powered actuator and an electronic controller, where the electronic controller controls operation of the electrically powered actuator. Some embodiments also include a testing unit for testing the energy storage. The testing unit may be configured to repeatedly carry out a test during operation of the ambulatory infusion device. Additionally, the test may include determining a control variable, the control variable being indicative of a capability of the energy storage for further powering the ambulatory infusion device.

Claims

1. Ambulatory infusion device, comprising:

an energy storage for storing electrical energy utilized for powering the ambulatory infusion device, the energy storage serving as a primary power source of the ambulatory infusion device, the energy storage being successively depleted during application;

a dosing unit with an electrically powered actuator and an electronic controller, the electronic controller controlling operation of the electrically powered actuator; and

a testing unit for testing the energy storage, the testing unit configured to repeatedly carry out a test during operation of the ambulatory infusion device, the test including determining a control variable, the control variable being indicative of a capability of the energy storage for further powering the ambulatory infusion device,

wherein the testing unit is configured to vary the testing of the energy storage in dependence of the control variable.

2. The ambulatory infusion device according to claim 1, wherein the testing unit is configured to vary the testing by reduce a testing interval for carrying out consecutive tests as a change of the control variable indicates a decreasing capability of the energy storage for further powering the ambulatory infusion device.

3. The ambulatory infusion device according to claim 1, wherein the testing unit comprises a test load having a test load resistance, wherein the test includes connecting the test load to the energy storage and the testing unit is configured to vary the testing by reducing the test load resistance as a change of the control variable indicates a decreasing capability of the energy storage for further powering the ambulatory infusion device.

4. The ambulatory infusion device according to claim 1, wherein the control variable includes at least one of the following:

a terminal voltage of the energy storage, an internal resistance of the energy storage, a first variable derived from the terminal voltage, and a second variable derived from the internal resistance.

5. The ambulatory infusion device according to claim 2, wherein the testing unit is configured to reduce the testing interval upon at least one of the following:

a decreasing terminal voltage and an increasing internal resistance.

6. The ambulatory infusion device according to claim 3, wherein the testing unit is configured to reduce the test load resistance upon at least one of the following:

a decreasing terminal voltage and an increasing internal resistance.

7. The ambulatory infusion device according to claim 1, wherein the testing unit is configured to trigger an alert upon the test indicating a lack of capability of the energy storage to further power the ambulatory infusion device.

8. The ambulatory infusion device according to claim 1, wherein the ambulatory infusion device is at least partially powered by a voltage converter and wherein the testing unit is configured to trigger an alert upon the test indicating an input voltage of the voltage converter falling below a minimum operating voltage of the voltage converter.

9. A method for testing an electrical energy storage of an ambulatory infusion device, the electrical energy storage serving as a primary power source of the ambulatory infusion device, the electrical energy storage being successively depleted during application, the method comprising:

repeatedly carrying out tests during operation of the ambulatory infusion device, at least one of the tests including a determination of a control variable, the control variable being indicative of a capability of the electrical energy storage for further powering the ambulatory infusion device; and

varying the testing in dependence of the control variable.

10. The method according to claim 9, further comprising varying the at least one test by reducing a testing interval for carrying out consecutive tests as a change of the control variable that indicates a decreasing capability of the electrical energy storage for further powering the ambulatory infusion device.

11. The method according to claim 9, further comprising coupling a test load to the electrical energy storage, the test load having a test load resistance and wherein varying the testing comprises reducing the test load resistance as a change of the control variable that indicates a decreasing capability of the electrical energy storage for further powering the ambulatory infusion device.

12. The method according to claim 9, further comprising determining at least one of the following:

a terminal voltage of the electrical energy storage, an internal resistance of the electrical energy storage, a variable derived from the terminal voltage, and the internal resistance as the control variable.

13. The method according to claim 10, further comprising reducing the testing interval for carrying out consecutive tests upon at least one of the following:

a decreasing terminal voltage and an increasing internal resistance.

14. The method according to claim 9, further comprising triggering an alert upon a test indicating a lack of capability of the electrical energy storage for further powering the ambulatory infusion device.

15. The method according to claim 9, further comprising triggering an alert upon a test indicating that the input voltage of a voltage converter falling below a minimum operating voltage of the voltage converter, wherein the ambulatory infusion device is powered, at least in part, by the voltage converter.