Impedance variability analysis to identify lead-related conditions
First Claim
1. A method comprising:
- obtaining a plurality of measured impedance values for an electrical path that are measured over multiple periods of time, wherein the electrical path comprises a plurality of electrodes for at least one of stimulation or sensing;
obtaining a central tendency of the plurality of measured impedance values for the electrical path;
determining an impedance value for the electrical path based on the central tendency;
determining an impedance variability value based on at least a difference between one of the plurality of measured impedance values and the determined impedance value, wherein the one of the plurality of measured impedance values comprises either a maximum or a minimum impedance value measured during one of the multiple periods of time, and wherein the impedance variability value indicates an expected level of variability for impedance measurements for the electrical path;
determining an impedance threshold value based on the determined impedance value and the impedance variability value;
comparing a newly measured impedance value for the electrical path to the impedance threshold value; and
indicating a possible condition of the electrical path based on the comparison.
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Accused Products
Abstract
In general, the disclosure relates to techniques for calculating mean impedance values and impedance variability values to detect a possible condition with a lead or device-lead pathway or connection. In one example, a device may be configured to determine an impedance value for an electrical path based on a plurality of measured impedance values for the electrical path, wherein the electrical path comprises a plurality of electrodes, and to determine an impedance variability value based on at least one of the plurality of measured impedance values. The device may be further configured to determine a threshold value based on the determined impedance value and the impedance variability value, compare a newly measured impedance value for the electrical path to the threshold value, and indicate a possible condition of the electrical path based on the comparison.
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Citations
42 Claims
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1. A method comprising:
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obtaining a plurality of measured impedance values for an electrical path that are measured over multiple periods of time, wherein the electrical path comprises a plurality of electrodes for at least one of stimulation or sensing; obtaining a central tendency of the plurality of measured impedance values for the electrical path; determining an impedance value for the electrical path based on the central tendency; determining an impedance variability value based on at least a difference between one of the plurality of measured impedance values and the determined impedance value, wherein the one of the plurality of measured impedance values comprises either a maximum or a minimum impedance value measured during one of the multiple periods of time, and wherein the impedance variability value indicates an expected level of variability for impedance measurements for the electrical path; determining an impedance threshold value based on the determined impedance value and the impedance variability value; comparing a newly measured impedance value for the electrical path to the impedance threshold value; and indicating a possible condition of the electrical path based on the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An implantable medical device comprising:
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a module configured to measure a plurality of impedance values for an electrical path associated with at least one implantable lead, wherein the plurality of measured impedance values are measured over multiple periods of time and, wherein the electrical path comprises a plurality of electrodes for at least one of patient stimulation or sensing; and a processor configured to; obtain a central tendency of the plurality of measure impedance values for the electrical path; determine an impedance value for the electrical path based on the central tendency; determine an impedance variability value based on at least a difference between one of the plurality of measured impedance values and the determined impedance value, wherein the one of the plurality of measured impedance values comprises either a maximum or a minimum impedance value measured during one of the multiple periods of time, and wherein the impedance variability value indicates an expected level of variability for impedance measurements for the electrical path; determine an impedance threshold value based on the determined impedance value and the impedance variability value; compare a newly measured impedance value for the electrical path to the impedance threshold value; and indicate a possible condition of the electrical path based on the comparison. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A system comprising:
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a module configured to receive a plurality of impedance values for an electrical path associated with at least one lead, wherein the plurality of measured impedance values are measured over multiple periods of time and, wherein the electrical path comprises a plurality of electrodes for at least one of patient stimulation or sensing; and one or more processors configured to; obtain a central tendency of the plurality of measured impedance values for the electrical path; determine an impedance value for the electrical path based on the central tendency; determine an impedance variability value based on at least a difference between one of the plurality of measured impedance values and the determined impedance value, wherein the one of the plurality of measured impedance values comprises either a maximum or a minimum impedance value measured during one of the multiple periods of time, and wherein the impedance variability value indicates an expected level of variability for impedance measurements for the electrical path; determine an impedance threshold value based on the determined impedance value and the impedance variability value; compare a newly measured impedance value for the electrical path to the impedance threshold value; and indicate a possible condition of the electrical path based on the comparison. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A system comprising:
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an impedance measurement module configured to receive a plurality of measured impedance values for an electrical path associated with at least one medical lead, wherein the plurality of measured impedance values are measured over multiple periods of time and, wherein the electrical path comprises a plurality of electrodes for at least one of patient stimulation or sensing; a threshold update module configured to obtain a central tendency of the plurality of measured impedance values for the electrical path, to determine an impedance value for the electrical path based on the central tendency, to determine an impedance variability value based on at least a difference between one of the plurality of measured impedance values and the determined impedance value, wherein the one of the plurality of measured impedance values comprises either a maximum or a minimum impedance value measured during one of the multiple periods of time, wherein the impedance variability value indicates an expected level of variability for impedance measurements for the electrical path, and wherein the threshold update module is further configured to determine an impedance threshold value based on the determined impedance value and the impedance variability value; a threshold comparison module configured to compare a newly measured impedance value for the electrical path to the impedance threshold value; and an integrity indication module configured to indicate a possible condition of the electrical path based on the comparison.
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41. A non-transitory computer-readable storage medium comprising instructions for causing one or more processors to:
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obtain a plurality of measured impedance values for an electrical path that are measured over multiple periods of time, wherein the electrical path comprises a plurality of electrodes for at least one of stimulation or sensing; obtain a central tendency of the plurality of measured impedance values for the electrical path; determine an impedance value for the electrical path based on the central tendency; determine an impedance variability value based on at least a difference between one of the plurality of measured impedance values and the determined impedance value, wherein the one of the plurality of measured impedance values comprises either a maximum or a minimum impedance value measured during one of the multiple periods of time, and wherein the impedance variability value indicates an expected level of variability for impedance measurements for the electrical path; determine an impedance threshold value based on the determined impedance value and the impedance variability value; compare a newly measured impedance value for the electrical path to the impedance threshold value; and indicate a possible condition of the electrical path based on the comparison.
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42. A system comprising:
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means for obtaining a plurality of measured impedance values for an electrical path that are measured over multiple periods of time, wherein the electrical path comprises a plurality of electrodes for at least one of stimulation or sensing; means for obtaining a central tendency of the plurality of measured impedance values for the electrical path; means for determining an impedance value for the electrical path based on the central tendency; means for determining an impedance variability value based on a difference between at least one of the plurality of measured impedance values and the determined impedance value, wherein the one of the plurality of measured impedance values comprises either a maximum or a minimum impedance value measured during one of the multiple periods of time, and wherein the impedance variability value indicates an expected level of variability for impedance measurements for the electrical path; means for determining an impedance threshold value based on the determined impedance value and the impedance variability value; means for comparing a newly measured impedance value for the electrical path to the impedance threshold value; and means for indicating a possible condition of the electrical path based on the comparison.
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Specification