Uni-polar and bi-polar switchable tracking system between
First Claim
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1. A system to collect map data of a volume in a patient, comprising:
- an instrument positionable within the volume;
a first electrode associated with the instrument;
a second electrode associated with the instrument;
an insulator operable to selectively cover at least one of the first and second electrodes;
a processor configured to analyze data from the first electrode and the second electrode to determine uni-polar sensing by one of the first electrode or the second electrode or bi-polar sensing by both of the first electrode and the second electrode; and
a switch coupled to the processor and operable to select between recording data from one or both of the first electrode and the second electrode;
wherein when recording data with both electrodes a bi-polar signal is recorded by the processor and when only recording data with one of the electrodes a uni-polar signal is recorded by the processor;
wherein the processor is operable to determine whether either or both of the first electrode or the second electrode is covered by the insulator at least based on the data from the first electrode and the second electrode.
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Abstract
An volume of a patient can be mapped with a system operable to identify a plurality of locations and save a plurality of locations of a mapping instrument. The mapping instrument can include one or more electrodes that can sense a voltage that can be correlated to a three dimensional location of the electrode at the time of the sensing or measurement. Therefore, a map of a volume can be determined based upon the sensing of the plurality of points without the use of other imaging devices. An implantable medical device can then be navigated relative to the mapping data.
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Citations
22 Claims
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1. A system to collect map data of a volume in a patient, comprising:
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an instrument positionable within the volume; a first electrode associated with the instrument; a second electrode associated with the instrument; an insulator operable to selectively cover at least one of the first and second electrodes; a processor configured to analyze data from the first electrode and the second electrode to determine uni-polar sensing by one of the first electrode or the second electrode or bi-polar sensing by both of the first electrode and the second electrode; and a switch coupled to the processor and operable to select between recording data from one or both of the first electrode and the second electrode; wherein when recording data with both electrodes a bi-polar signal is recorded by the processor and when only recording data with one of the electrodes a uni-polar signal is recorded by the processor; wherein the processor is operable to determine whether either or both of the first electrode or the second electrode is covered by the insulator at least based on the data from the first electrode and the second electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of determining when a uni-polar or a bi-polar signal is sensed in a volume of a heart, comprising:
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positioning a first electrode near a second electrode in the volume of the heart; sensing electrical activity in the volume of the heart with the first and second electrodes; analyzing a first signal from the first electrode based on the sensed electrical activity; analyzing a second signal from the second electrode based on the sensed electrical activity; determining whether the first signal and the second signal are similar; determining that one of the first electrode or the second electrode is insulated from sensing a signal when a determination is made that the first signal and the second signals are dissimilar; and switching sensing to uni-polar sensing when the determination is that one of the first electrode or the second electrode is insulated from sensing. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method of evaluating a signal from within a volume based on a uni-polar or a bi-polar signal, comprising:
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providing at least one set of axis generation electrodes on an exterior surface of the volume, the at least one set of axis generation electrodes arranged to establish an axis via a conductive path therebetween; injecting a current into the volume between the at least one set of electrodes and generating a voltage gradient in the volume between the at least one set of electrodes; analyzing a first signal from a first electrode of an instrument in the volume; analyzing a second signal from a second electrode of the instrument in the volume, wherein an insulative cover is moveable relative to at least one of the first electrode or the second electrode; determining if one of the first electrode or the second electrode is insulated from sensing the voltage gradient in the volume based on the injected current in the volume; and automatically switching between sensing uni-polar when only one of the first electrode or the second electrode is determined to be exposed to the voltage gradient in the volume based on the injected current and sensing bi-polar when both the first electrode and the second electrode are exposed to sense the voltage gradient in the volume based on the injected current. - View Dependent Claims (20, 21, 22)
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Specification