Apparatus and method for determining the relative position and orientation of neurostimulation leads
First Claim
1. A system, comprising:
- an implantable pulse generator;
a plurality of electrodes configured to be operably coupled to the implantable pulse generator, the plurality of electrodes including a return or reference electrode and further including other electrodes; and
a programmable external device configured to program the implantable pulse generator,wherein the system configured to;
measure a first monopolar electrical impedance between a first one of the other electrodes and the return or reference electrode;
measure a second monopolar electrical impedance between each of the other ones of the other electrodes and the return or reference electrode;
measure a bipolar electrical impedance between the first one of the other electrodes and each of the other ones of the other electrodes;
determine the amplitude of a field potential at each of the other electrodes based on the measured first monopolar electrical impedance, each of the second monopolar electrical impedances, and each of the measured bipolar electrical impedances; and
determine the relative positions of the electrodes based on each of the determined field potential amplitudes.
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Accused Products
Abstract
A method for determining whether the relative position of electrodes used by a neurostimulation system has changed within a patient comprises determining the amplitude of a field potential at each of at least one of the electrodes, determining if a change in each of the determined electric field amplitudes has occurred, and analyzing the change in each of the determined electric field amplitudes to determine whether a change in the relative position of the electrodes has occurred. Another method comprises measuring a first monopolar impedance between a first electrode and a reference electrode, measuring a second monopolar impedance between second electrode and the reference electrode, measuring a bipolar impedance between the first and second electrodes, and estimating an amplitude of a field potential at the second electrode based on the first and second monopolar impedances and the bipolar impedance.
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Citations
20 Claims
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1. A system, comprising:
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an implantable pulse generator; a plurality of electrodes configured to be operably coupled to the implantable pulse generator, the plurality of electrodes including a return or reference electrode and further including other electrodes; and a programmable external device configured to program the implantable pulse generator, wherein the system configured to; measure a first monopolar electrical impedance between a first one of the other electrodes and the return or reference electrode; measure a second monopolar electrical impedance between each of the other ones of the other electrodes and the return or reference electrode; measure a bipolar electrical impedance between the first one of the other electrodes and each of the other ones of the other electrodes; determine the amplitude of a field potential at each of the other electrodes based on the measured first monopolar electrical impedance, each of the second monopolar electrical impedances, and each of the measured bipolar electrical impedances; and determine the relative positions of the electrodes based on each of the determined field potential amplitudes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system, comprising:
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an implantable pulse generator; a plurality of electrodes configured to be operably coupled to the implantable pulse generator, the plurality of electrodes including a return or reference electrode and further including other electrodes; and a programmable external device configured to program the implantable pulse generator, wherein the system configured to; measure a first monopolar impedance between a first one of the other electrodes and the return or reference electrode; measure a second monopolar impedance between a second one of the other electrodes and the return or reference electrode; measure a bipolar impedance between the first electrode and the second electrode; and estimate an amplitude of a field potential at the second electrode based on the first and second monopolar impedances and the bipolar impedance. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A system, comprising:
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an implantable pulse generator; a plurality of electrodes configured to be operably coupled to the implantable pulse generator, the plurality of electrodes including at least one electrode and further including a return or reference electrode; and a programmable external device configured to program the implantable pulse generator, wherein the system configured to perform two measurement processes selected from the following measurement processes; (1) a measurement process to measure a first monopolar impedance between a first one of the electrodes and a return or reference electrode, and measure a second monopolar impedance between a second one of the electrodes and the return or reference electrode; (2) a measurement process of a bipolar impedance between the first electrode and the second electrode; and (3) a measurement process a field potential at the second electrode; and wherein the system is further configured to estimate a remaining one of the (1) first and second monopolar impedances;
(2) the bipolar impedance; and
(3) the field potential based on the performance of the two measurements in accordance with the equation Φ
=(Ibp−
Imp1−
Imp2)/2, where Φ
equals the field potential, Ibp equals the bipolar electrical impedance, Imp1 equals the first monopolar electrical impedance, and Imp2 equals the second monopolar electrical impedance.
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Specification