Automated impedance measurement of an implantable medical device

• US 6,978,171 B2
• Filed: 03/15/2002
• Issued: 12/20/2005
• Est. Priority Date: 03/15/2002
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Goetz, Steven M., Hartmann, James M., Barnhorst, Jordan A.
• Primary Examiner(s): Winakur, Eric F.
• Assistant Examiner(s): Kremer, Matthew
• Application Number:
  US10/099,436
• Publication Number:
  US 20030176807A1
• Time in Patent Office: 1,376 Days
• Field of Search: 600309-310, 600/547, 607/8, 607/28
• US Class Current: 600/547
• CPC Class Codes: A61N 1/08 Arrangements or circuits for monitoring, protecting, controlling or indicating for external stimulators A61N1/3603; for implantable neurostimulators A61N1/36128; for heart stimulators A61N1/37; for defibrillators A61N1/3925
• CPC Class Codes: A61N 1/3614 based on impedance measurement
• CPC Class Codes: A61N 1/36185 Selection of the electrode configuration
• CPC Class Codes: A61N 1/37247 User interfaces, e.g. input or presentation means

Abstract

The present invention automates impedance measurements between pairs of electrodes that are associated with a lead of an implanted device. Apparatus comprises a communications module and a processor, in which the processor communicates with the implanted device over a communications channel. The processor instructs the implanted device to perform a voltage measurement that is associated with a stimulation pulse between the pair of electrodes. The implanted device sends the voltage measurement to the apparatus over the communications channel from which the apparatus determines the impedance between the pair of electrodes. The apparatus initiates an impedance measurement for each pair of electrodes along the lead. With a plurality of leads, the apparatus repeats the impedance measurements for electrode pairs of the other leads. The embodiment also supports measuring a current between pairs of electrodes. The impedance measurements and current measurements are displayed to a clinician on a user interface.

Claims

1. A method for automating impedance measurements associated with an implanted device, the method comprising:

(a) configuring a parameter of a stimulation pulse of the implanted device;

(b) performing a measurement process with the stimulation pulse in order to determine an impedance value corresponding to at least one electrode comprising;

(i) instructing the implanted device to perform a measurement that is associated with the at least one electrode, wherein the at least one electrode is contained on a lead;

(ii) calculating the impedance value utilizing the measurement, wherein (i) and (ii) are repeated for each at least one other electrode that is associated with the lead; and

(iii) upon completion of (i) and (ii), restoring an original value of the parameter; and

(c) automatically processing the impedance value.

2. The method of claim 1, wherein the at least one electrode comprises at least eight electrodes.

3. The method of claim 1, wherein (c) comprises:

(i) displaying the impedance value on a user interface.

4. The method of claim 1, wherein (c) comprises:

(i) storing the impedance value.

5. The method of claim 1, wherein the measurement corresponds to a final voltage value of a stimulation pulse.

6. The method of claim 1, wherein (b) further comprises:

(iv) instructing the implanted device to activate a second lead; and

(v) repeating (i) and (ii) for each of the at least one electrode that is associated with the second lead.

7. The method of claim 1, further comprising:

(d) interrogating the implanted device to determine a device type.

8. The method of claim 1, further comprising:

(d) instructing the implanted device to measure a value of current of the at least one electrode; and

(e) processing the value of current.

9. The method of claim 8, wherein the at least one electrode comprises at least eight electrodes.

10. The method of claim 1, wherein an amplitude of a stimulation pulse is essentially zero between a repetition of (i) and (ii).

11. A method for automating impedance measurements associated with an implanted device, the method comprising the steps of:

(a) configuring a parameter of a stimulation pulse of the implanted device;

(b) performing a measurement process with the stimulation pulse in order to determine an impedance value corresponding to a set of electrodes, wherein step (b) comprises the steps of;

(i) instructing the implanted device to perform a measurement that is associated with the set of electrodes, wherein the set of electrodes are contained on a lead;

(ii) calculating the impedance value utilizing the measurement; and

(iii) restoring an original value of the parameter upon completing step (i) and step (ii), wherein step (i), step (ii) and step (iii) are repeated for each set of electrodes that is associated with the lead; and

(c) automatically processing the impedance value.

12. Apparatus for automating impedance measurements associated with an implanted device, the apparatus comprising:

a communications module; and

a processor that communicates with the implanted device through the communications module, the processor configured to perform the steps of;

(a) configuring a parameter of a stimulation pulse of the implanted device;

(b) performing a measurement process with the stimulation pulse in order to determine an impedance value corresponding to a set of electrodes; and

(c) automatically processing the impedance value.

13. The apparatus of claim 12, wherein the set of electrodes comprises a pair of electrodes.

14. The apparatus of claim 12, wherein (c) comprises:

(i) displaying the impedance value on a user interface.

15. The apparatus of claim 12, wherein (c) comprises:

(i) storing the impedance value.

16. The apparatus of claim 12, wherein (b) comprises:

(i) instructing the implanted device to perform a measurement that is associated with the set of electrodes, the set of electrodes contained on a lead; and

(ii) calculating the impedance value utilizing the measurement.

17. The apparatus of claim 12, wherein the processor is configured to further perform:

(d) instructing the implanted device to measure a value of current of the set of electrodes; and

(e) processing the value of current.

18. The apparatus of claim 17, wherein the set of electrodes comprises a pair of electrodes.

19. A method in a computer system for displaying information in order to automate impedance measurements associated with an implanted device, the method comprising:

(a) displaying an identification of a pair of electrodes;

(b) displaying a value of impedance that is associated with the pair of electrodes; and

(c) displaying an indicator that is indicative of a consistency between the value of impedance and a corresponding measured current associated with the pair of electrodes.

20. A method for automating impedance measurements associated with an implanted device, the method comprising:

(a) configuring a parameter of a stimulation pulse of the implanted device;

(b) performing a measurement process with the stimulation pulse in order to determine an impedance value corresponding to a set of electrode;

(c) automatically processing the impedance value;

(d) displaying an identification of the set of electrodes;

(e) displaying the value of impedance that is associated with the set of electrodes; and

(f) displaying a value of current that is measured for the set of electrodes.