Implantable lead functional status monitor and method

• US 20040162593A1
• Filed: 02/18/2004
• Published: 08/19/2004
• Est. Priority Date: 01/19/2000
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Wahlstrand, John D., McVenes, Rick D., Peck, Bradley C., Jorgenson, David J., Trautmann, Charles D., Starkson, Ross O.
• Granted Patent: US 7,797,047 B2
• Time in Patent Office: Days
• US Class Current: 607/27
• CPC Class Codes: A61N 1/3706 Pacemaker parameters stimulation threshold A61N1/371
• CPC Class Codes: A61N 1/3925 Monitoring; Protecting

Abstract

A system for monitoring trends in lead impedance includes collecting data from various sources in an implantable medical device system. Lead impedance, non-physiologic sensed events percentage of time in mode switch, results of capture management operation, sensed events, adversion pace counts, refractory sense counts and similar data are used to determine the status of a lead. A set of weighted sum rules are implemented by a software system to process the data and provide displayable information to health care professionals via a programmer. The lead monitoring system includes a patient alert system for patients to seek help in the event a serious lead condition is identified.

Claims

1. An implantable medical device (IMD) including a lead status monitoring system employing a method comprising the steps of:

collecting data sets from a lead impedance source, a stimulation threshold source, and at least one additional source included in the IMD; and

processing the data sets to determine if a lead status event has occurred.

2. The method of claim 1, further comprising the step of providing a message indicating a lead-related condition to a user based on the lead status event.

3. The method of claim 1, wherein the at least one additional source includes a non-physiological sensed event source.

4. The method of claim 1, wherein the at least one additional source includes a percent time in mode switch source.

5. The method of claim 1, wherein the at least one additional source includes an R-wave and P-wave amplitude source.

6. The method of claim 1, wherein the at least one additional source includes a reversion pace count source.

7. The method of claim 1, wherein the at least one additional source includes a refractory sense count source.

8. The method of claim 1, wherein the at least one additional source includes a high rate episode count source.

9. The method of claim 1, wherein the at least one additional source includes a time from implant source.

10. The method of claim 1, wherein the collecting of data sets occurs at a frequency that depends upon a time from implant.

11. The method of claim 2, wherein the message indicates a lead conductor or connector issue.

12. The method of claim 2, wherein the message indicates a lead insulation issue.

13. The method of claim 2, wherein the message indicates a biological interface issue.

14. The method of claim 13, wherein the biological interface issue includes myocardial perforation.

15. The method of claim 13, wherein the biological interface issue includes lead dislodgement.

16. The method of claim 13, wherein the biological interface issue includes exit block.