System and method to evaluate electrode position and spacing
First Claim
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1. A system to determine a location of an electrode within a volume, comprising:
- a medical device sized and shaped to be positioned by implantation and contained within the volume, the medical device including;
a lead having a first implantable electrode;
an implantable case containing an electronics system operable to receive a signal from the first implantable electrode, wherein the first implantable electrode is operable to move based on contact with a surface within the volume and relative to the implantable medical device;
a connector extending from the lead to be connected to the electronics system; and
a current injecting system operable to inject a current into the volume between a first injecting electrode and a second injecting electrode;
wherein the first implantable electrode is operable to sense a voltage at a location due at least in part to the current injected into the volume.
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Abstract
An IMD can be implanted into a patient to address various conditions. The IMD case and leads can have various electrodes and other portions to measure various physiological conditions. For example, a selected current can be generated between two electrodes, either external or internal in the patient, and a voltage can be measured by one or more electrodes of the IMD. A voltage can be measured at two or more locations to determine a relative motion of different electrodes. If the electrodes are in different portions of the heart, a determination can be made of a relative motion or position of the heart or portions of the heart.
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Citations
45 Claims
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1. A system to determine a location of an electrode within a volume, comprising:
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a medical device sized and shaped to be positioned by implantation and contained within the volume, the medical device including; a lead having a first implantable electrode; an implantable case containing an electronics system operable to receive a signal from the first implantable electrode, wherein the first implantable electrode is operable to move based on contact with a surface within the volume and relative to the implantable medical device; a connector extending from the lead to be connected to the electronics system; and a current injecting system operable to inject a current into the volume between a first injecting electrode and a second injecting electrode; wherein the first implantable electrode is operable to sense a voltage at a location due at least in part to the current injected into the volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system to measure a position of a surface of a portion of an anatomy, comprising:
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a medical device sized to be implanted with the anatomy, including; a lead including a first electrode fixed to a surface of the anatomy; a position sensing system operable to sense a voltage at the first electrode at least a first time and a second time to generate a first sensed voltage signal and a second sensed voltage signal with the first electrode; and a processor operable to compare a first sensed voltage and a second sensed voltage at the first electrode; and a current injecting system operable to inject a current into the anatomical system to generate the voltage sensed by the first electrode; wherein the processor undersamples the first sensed voltage signal and the second sensed voltage signal from the position sensing system with intentional aliasing. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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27. A system to determine a location of an electrode with a volume, comprising:
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a medical device sized to be positioned and contained within the volume, including; an implantable case; a lead connected to a connector associated with the implantable case having a first implantable electrode, wherein the first implantable electrode is operable to contact and move with a surface within the volume; and a processor positioned within the implantable case and operable to execute a first set of instructions when a signal from the lead is received to affect the volume in a first manner; and a current injecting system operable to inject a current into the volume between a first injecting electrode and a second injecting electrode and the first implantable electrode is operable to sense a voltage at a location due at least in part to the injected current; wherein the processor is operable to change the first set of instructions based upon the sensed voltage to affect the volume in a second manner different from the first manner. - View Dependent Claims (28, 29, 30, 31, 32)
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33. A method of measuring movement of an electrode within a volume, comprising:
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providing an implantable device; implanting a lead extending from the implantable device into a surface within the volume, the lead having a first electrode; injecting a current in the volume; sensing a voltage in the volume with the first electrode; sending a sensed voltage signal based on the sensed voltage to an electronics system of the implantable device; and undersampling the sent sensed voltage signal. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A system to measure a position of a surface of a portion of an anatomy, comprising:
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an implantable medical device including; a lead including a first electrode; a position sensing system operable to sense a voltage at the first electrode, the position sensing includes at least one of an electrogram filter, a myocardial infarction detection system, a sensing system for timing and rhythm detection, and an evoked response detection system; a first processor operable to compare a first sensed voltage and a second sensed voltage at the first electrode; a power source having a finite power supply; and a first telemetry system operable to transmit and receive information regarding at least the first electrode; and a current injecting system operable to inject a current into the anatomy to generate the voltage sensed by the first electrode, including; a first pair of injecting electrodes and a second pair of injecting electrodes; a current source system operable to inject a current between the first pair of injecting electrodes and the second pair of injecting electrodes; and a second telemetry system operable to communicate with the first telemetry system; wherein the first processor undersamples a signal from the first electrode to include intentional aliasing, wherein the undersampled signal is operable to be transmitted with the first telemetry system from the implantable medical device to the second telemetry system of the current injecting system, wherein the undersampled signal includes substantially all necessary information and is transmitted at a selected current drain from the finite power supply; wherein a second processor of the current injecting system is operable to transform the undersampled signal in a selected frequency domain to identify three signal components; wherein the signals are measured over time to determine information regarding the position of the first electrode. - View Dependent Claims (44, 45)
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Specification