Implantable lead functional status monitor and method

• US 7,797,047 B2
• Filed: 02/18/2004
• Issued: 09/14/2010
• 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.
• Primary Examiner(s): Evanisko; George R
• Assistant Examiner(s): HOLMES, REX R
• Application Number:
  US10/781,426
• Publication Number:
  US 20040162593A1
• Time in Patent Office: 2,400 Days
• Field of Search: 607/28, 607/27, 607/7, 607/8
• 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

An implantable medical device (IMD) includes a lead status monitoring system. The lead status monitoring system employs a method including 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.

Claims

1. A method of lead status monitoring by a lead status monitor in an implantable medical device, the method comprising:

measuring an impedance along an electrical pathway;

measuring a non-physiologic sensed event along the electrical pathway;

collecting data relating to a percent of time in mode switch, an R-wave amplitude, a P-wave amplitude, a reversion pace count, and a time from implant;

processing, by the lead status monitor, the collected data, the measured impedance and the non-physiologic sensed events with an algorithm having a set of weighted sum rules, and determine a result of the algorithm, wherein the algorithm assigns a weight to each of the measured impedance, the measured non-physiologic sensed event, and each of the percent of time in mode switch, the R-wave amplitude, the P-wave amplitude, the reversion pace count, and the time from implant; and

determining, by the lead status monitor, if a lead status event has occurred based on the result of the algorithm.

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

3. The method of claim 2, wherein the message indicates one of a lead conductor or connector issue, a lead insulation issue, and a biological interface issue.

4. The method of claim 3, wherein the biological interface issue includes one of myocardial perforation, lead dislodgement, and exit block.

5. The method of claim 1, wherein the processing comprises:

summing the assigned weighted values to determine if one of a plurality of lead status events has occurred.

6. The method of claim 1, wherein collecting data further comprises collecting data relating to at least one of a refractory sense count or a high rate episode count, and wherein the algorithm assigns a value to the at least one of the refractory sense count or the high rate episode count.