Lead condition assessment for an implantable medical device
First Claim
1. A method for assessing a condition of a lead assembly coupled to an implantable medical device (IMD), comprising:
- determining a first impedance relative to a first electrode and a reference electrode;
determining a second impedance relative to a second electrode and said reference electrode;
comparing said first impedance to said second impedance to determine an impedance difference;
determining whether said impedance difference is outside a predetermined tolerance range; and
providing an indication of a lead condition error in response to determining that said impedance difference is outside said predetermined tolerance range.
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Accused Products
Abstract
A method, system, and apparatus for performing a lead condition assessment and/or a lead orientation determination associated with an implantable medical device (IMD). A first impedance is determined. The first impedance relates to the impedance relative to a first electrode and a portion of the IMD. A second impedance is determined. The second impedance relates to the impedance relative to a second electrode and the portion of the IMD. The first impedance is compared with the second impedance to determine an impedance difference. A determination is made whether the impedance difference is outside a predetermined tolerance range. Furthermore, artifact measured during impedance measurements or test pulses may be compared to assess lead orientation. An indication of a lead condition error is provided in response to determining that the impedance difference is outside the predetermined tolerance range.
80 Citations
21 Claims
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1. A method for assessing a condition of a lead assembly coupled to an implantable medical device (IMD), comprising:
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determining a first impedance relative to a first electrode and a reference electrode;
determining a second impedance relative to a second electrode and said reference electrode;
comparing said first impedance to said second impedance to determine an impedance difference;
determining whether said impedance difference is outside a predetermined tolerance range; and
providing an indication of a lead condition error in response to determining that said impedance difference is outside said predetermined tolerance range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for determining a condition of a lead assembly associated with an implantable medical device (IMD), comprising:
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determining a first impedance relative to a first electrode and a reference electrode;
determining a second impedance relative to a second electrode and said reference electrode;
determining a third impedance relative to said first electrode and said second electrode;
comparing said first impedance to said second impedance to determine an impedance difference;
determining whether said impedance difference is outside a predetermined tolerance range;
providing an indication of a lead condition error in response to determining that said impedance difference is outside a predetermined tolerance range;
comparing said impedance difference to said third impedance; and
identifying a source of said lead condition error based upon said comparing of said impedance difference to said third impedance, said source comprising at least one of said first electrode, said second electrode, and a physiological impedance.
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14. A method for determining a condition of a lead assembly associated with an implantable medical device (IMD), comprising:
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providing a first test signal to a first electrode coupled to said IMD through a first lead;
measuring a first signal artifact relating to a second electrode coupled to said IMD through a second lead, said first signal artifact resulting from said first test signal being applied to said first electrode;
providing a second test signal to said second electrode;
measuring a second signal artifact relating to said first electrode, said second signal artifact resulting from said second test signal being applied to said second electrode;
comparing said first signal artifact to said second signal artifact to determine a signal artifact differential;
determining whether said signal artifact differential is outside a predetermined tolerance range; and
providing an indication of a lead condition error in response to determining that said signal artifact differential is outside said predetermined tolerance range. - View Dependent Claims (15)
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16. A method for determining an orientation of a lead assembly associated with an implantable medical device (IMD), comprising:
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determining a first impedance relative to a first electrode and a reference electrode;
determining a second impedance relative to a second electrode and said reference electrode;
comparing said first impedance to said second impedance to determine whether said first impedance is greater than said second impedance;
determining which of said first electrode and said second electrodes is positioned distal to said reference electrode based upon comparing said first and second impedances. - View Dependent Claims (17, 18)
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19. A medical device system (MDS) for providing therapy, comprising:
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an implantable medical device (IMD) for delivering an electrical signal to a patient'"'"'s body;
a first electrode coupled to said IMD and to a first portion of the patient'"'"'s body;
a second electrode coupled to said IMD and to a second portion of the patient'"'"'s body;
an external device to communicate with said IMD; and
wherein said MDS comprises a controller to determine a first impedance relative to a first electrode and a reference electrode, determine a second impedance relative to a second electrode and said reference electrode, compare said first impedance and said second impedance to determine an impedance difference, and determine whether said impedance difference is outside a predetermined tolerance range;
and wherein said MDS provides an indication of a lead condition error in response to determining that said impedance difference is outside said predetermined tolerance range. - View Dependent Claims (20)
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21. A computer readable program storage device encoded with instructions that, when executed by a computer, performs a method for determining a condition of a lead assembly associated with an implantable medical device (IMD), comprising:
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determining a first impedance, said first impedance relating to the impedance relative to a first electrode and a reference electrode;
determining a second impedance, said second impedance relating to the impedance relative to a second electrode and said reference electrode;
comparing said first impedance to said second impedance to determine an impedance difference;
determining whether said impedance difference is outside a predetermined tolerance range; and
providing an indication of a lead condition error in response to determining that said impedance difference is outside said predetermined tolerance range.
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Specification