Lead condition assessment for an implantable medical device
First Claim
1. A method comprising:
- determining, at an impedance unit of an implantable medical device (IMD) or an external unit configured to communicate with the IMD, a first impedance relative to a first electrode and a reference electrode;
determining, at the IMD or the external unit, a second impedance relative to a second electrode and the reference electrode;
comparing, at the IMD or the external unit, the first impedance to the second impedance to determine an impedance difference;
determining, at the IMD or the external unit, a position of the first electrode relative to the second electrode based on at least the impedance difference; and
providing an indication of a change in impedance in response to determining that the impedance difference is outside a 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.
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Citations
20 Claims
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1. A method comprising:
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determining, at an impedance unit of an implantable medical device (IMD) or an external unit configured to communicate with the IMD, a first impedance relative to a first electrode and a reference electrode; determining, at the IMD or the external unit, a second impedance relative to a second electrode and the reference electrode; comparing, at the IMD or the external unit, the first impedance to the second impedance to determine an impedance difference; determining, at the IMD or the external unit, a position of the first electrode relative to the second electrode based on at least the impedance difference; and providing an indication of a change in impedance in response to determining that the impedance difference is outside a predetermined tolerance range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An implantable medical device (IMD) comprising:
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a stimulation unit configured to deliver an electrical signal to a patient, wherein the stimulation unit is configured to be coupled to a first electrode, wherein the stimulation unit is configured to be coupled to a second electrode; an impedance unit configured to determine a first impedance between the first electrode and a reference electrode, wherein the impedance unit is configured to determine a second impedance between the second electrode and the reference electrode, wherein the impedance unit is configured to compare the first impedance to the second impedance to determine an impedance difference; a processor coupled to the impedance unit and configured to determine a position of the first electrode relative to the second electrode based on at least the impedance difference; and the impedance unit is further configured to determine whether the impedance difference is outside a predetermined tolerance range, wherein the impedance unit is further configured to provide an indication of a change in impedance in response to determining that the impedance difference is outside the predetermined tolerance range. - View Dependent Claims (11, 12, 13, 14)
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15. A method comprising:
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determining, at an impedance unit of an implantable medical device (IMD) or an external unit configured to communicate with the IMD, a first impedance relative to a first electrode and a reference electrode; determining, at the IMD or the external unit, a second impedance relative to a second electrode and the reference electrode; comparing, at the IMD or the external unit, the first impedance to the second impedance to determine an impedance difference; determining, at the IMD or the external unit, a position of the first electrode relative to the second electrode based on at least the impedance difference; and providing an indication of a lead condition error in response to determining that the impedance difference is outside a predetermined tolerance range. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification