External charger usable with an implantable medical device having a programmable or time-varying temperature set point

• US 8,321,029 B2
• Filed: 09/18/2009
• Issued: 11/27/2012
• Est. Priority Date: 09/18/2009
• Status: Active Grant

• Current Assignee: Boston Scientific Neuromodulation Corporation (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Neuromodulation Corporation (Boston Scientific Corporation)
• Inventors: Aghassian, Daniel
• Primary Examiner(s): Layno, Carl H
• Assistant Examiner(s): Stice, Paula J
• Application Number:
  US12/562,694
• Publication Number:
  US 20110071597A1
• Time in Patent Office: 1,166 Days
• Field of Search: 607/30, 607 60- 61
• US Class Current: 607/61
• CPC Class Codes: A61N 1/37235 Aspects of the external programmer
• CPC Class Codes: A61N 1/3787 from an external energy source
• CPC Class Codes: H02J 2310/23 The load being a medical device, a medical implant, or a life supporting device
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/007192 in response to temperature
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage

Abstract

An improved external charger for charging the battery within or providing power to an implantable medical device is disclosed. The improved external charger includes circuitry for detecting the temperature of the external charger and for controlling charging to prevent exceeding a maximum temperature. The external charger in some embodiments includes a user interface for allowing a patient to set the external charger'"'"'s maximum temperature. The user interface can be used to select either constant maximum temperatures, or can allow the user to choose from a number of stored charging programs, which programs can control the maximum temperature to vary over time. Alternatively, a charging program in the external charger can vary the maximum temperature set point automatically. By controlling the maximum temperature of the external charger during charging in these manners, the time needed to charge can be minimized while still ensuring a temperature that is comfortable for that patient.

Claims

1. An external charger for use with an implantable medical device, comprising:

a coil for producing energy receivable by the implantable medical device to power or charge the implantable medical device;

temperature monitoring and control circuitry for detecting a temperature of the external charger and controlling activation of the coil in accordance with a temperature set point; and

memory comprising a temperature program for indicating the temperature set point to the temperature monitoring and control circuitry during a charging session, wherein the temperature set point is configured to vary during a charging session.

2. The external charger of claim 1, wherein the temperature set point decreases during the charging session.

3. The external charger of claim 1, wherein the temperature set point is set to a first temperature during a first time period and is set to a second temperature during a second time period.

4. The external charger of claim 3, wherein the first temperature is greater than the second temperature, and wherein the first time period is less than the second time period.

5. The external charger of claim 1, wherein the temperature program automatically executes at a beginning of the charging session.

6. The external charger of claim 1, wherein the temperature monitoring and control circuitry disables activation of the coil after a predetermined charging time.

7. An external charger for use with an implantable medical device, comprising:

a coil, selectively activated for producing energy receivable by the implantable medical device to power or recharge the implantable medical device;

a temperature-sensitive element for detecting the temperature of the external charger;

control circuitry configured to disable or reduce activation of the coil when the external charger temperature during a charging session is above a programmable maximum temperature; and

wherein the maximum temperature is programmed to automatically vary over time during the charging session.

8. The external charger of claim 7, further comprising a user interface, wherein the user interface is configured to allow for selection of the programmable maximum temperature.

9. The external charger of claim 8, wherein the user interface is configured to select the programmable maximum temperature from a plurality of pre-defined maximum temperatures.

10. The external charger of claim 7, wherein the maximum temperature comprises a first programmable maximum temperature during a first portion of a charging session and a second programmable maximum temperature during a second portion of the charging session.

11. The external charger of claim 10, wherein the first programmable maximum temperature is higher than the second programmable maximum temperature.

12. The external charger of claim 7, wherein the control circuitry disables activation of the coil after a predetermined charging time.

13. The external charger of claim 7,

wherein the control circuitry is further configured to enable activation of the coil during the charging session when the external charger temperature is below a programmable minimum temperature, and

wherein the minimum temperature is programmed to automatically vary over time during the charging session.

14. The external charger of claim 7, wherein the control circuitry is configured to enable stimulation of the coil during the charging session when the external charger temperature is below the programmable maximum temperature.

15. A system, comprising:

an implantable medical device, comprising;

a first coil for receiving energy to provide power for operating the implantable medical device; and

an external charger, comprising;

a second coil, selectively stimulated for producing energy receivable by the first coil; and

a control circuitry comprising a temperature-sensitive element for detecting the temperature of a portion of the external charger, the control circuitry configured to disable activation of the second coil when the external charger temperature is above a programmable maximum temperature,

wherein the programmable maximum temperature automatically varies over time during a charging session.

16. The system of claim 15, further comprising:

a user interface for the external charger, configured to program the programmable maximum temperature.

17. The system of claim 16, wherein the user interface is configured for direct entry of the programmable maximum temperature.

18. The system of claim 16, wherein the user interface is configured to select the programmable maximum temperature from a plurality of pre-defined maximum temperatures.

19. The system of claim 16, wherein the user interface is configured to select a program of a plurality of temperature programs, the selected program establishing the programmable maximum temperature as:

a first maximum temperature during a first portion of a charging session and

a second maximum temperature during a second portion of the charging session, different from the first maximum temperature.

20. The system of claim 16,

wherein the user interface is configured to select a program from a plurality of temperature programs,

wherein a first program of the plurality of temperature programs establishes the programmable maximum temperature as a first maximum temperature for an entire charging session, and

wherein a second program of the plurality of temperature programs establishes the programmable maximum temperature as:

a first maximum temperature during a first portion of a charging session and

a second maximum temperature during a second portion of the charging session, different from the first maximum temperature.

21. The system of claim 15,

wherein the temperature detection circuitry is further configured to enable activation of the coil during the charging session when the external charger temperature is below a programmable minimum temperature, and

wherein the programmable minimum temperature depends on the programmable maximum temperature.

22. The system of claim 15, wherein the temperature detection circuitry is configured to enable activation of the coil during a charging session when the external charger temperature is below the programmable maximum temperature.

23. The system of claim 15, wherein the control circuitry disables activation of the coil after a predetermined charging time.