Implantable lead functional status monitor and method
First Claim
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1. A method comprising:
- measuring, by a control circuit of an implantable medical device (IMD), a unipolar impedance value along a unipolar electrical pathway of a lead having a plurality of electrodes using one or more subthreshold pulses, wherein the lead is coupled to the IMD;
measuring, by the control circuit, a bipolar impedance value along a bipolar electrical pathway of the lead having the plurality of electrodes using one or more subthreshold pulses; and
identifying, by the control circuit, the presence of a lead-related condition based on a comparison of the unipolar impedance value measured along the unipolar electrical pathway and the bipolar impedance value measured along the bipolar electrical pathway.
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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.
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Citations
18 Claims
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1. A method comprising:
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measuring, by a control circuit of an implantable medical device (IMD), a unipolar impedance value along a unipolar electrical pathway of a lead having a plurality of electrodes using one or more subthreshold pulses, wherein the lead is coupled to the IMD; measuring, by the control circuit, a bipolar impedance value along a bipolar electrical pathway of the lead having the plurality of electrodes using one or more subthreshold pulses; and identifying, by the control circuit, the presence of a lead-related condition based on a comparison of the unipolar impedance value measured along the unipolar electrical pathway and the bipolar impedance value measured along the bipolar electrical pathway. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A medical device system comprising:
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a lead having a plurality of electrodes; and an implantable medical device coupled to the lead and having a control circuit that measures a unipolar impedance value along a unipolar electrical pathway using one or more subthreshold pulses, measures a bipolar impedance value along a bipolar electrical pathway using one or more subthreshold pulses, compares the unipolar impedance value measured along the unipolar electrical pathway with the bipolar impedance value measured along the bipolar electrical pathway, and identifies presence of the lead-related condition based on the comparison. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A medical device system comprising:
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a lead having a plurality of electrodes; and an implantable medical device coupled to lead and having a control circuit that senses signals along a first sensing pathway formed by one or more of the plurality of electrodes, senses signals along a second sensing pathway, different from the first sensing pathway, formed by one or more of the plurality of electrodes, determines whether a number of non-physiologic sensed events occurring along the first sensing pathway is greater than a first threshold associated with the first sensing pathway to generate a first event count, determines whether a number of non-physiologic sensed events occurring along the second sensing pathway is greater than a second threshold associated with the second sensing pathway to generate a second event count, and identifies the presence of a lead-related condition based on the first event count and the second event count. - View Dependent Claims (17, 18)
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Specification