Method and apparatus for guiding ablative therapy of abnormal biological electrical excitation
First Claim
1. A method for localizing an electrical source in the body comprising:
- placing passive electrodes on the body;
placing at least one active electrode in the body;
acquiring from the passive electrodes signals emanating from the electrical source;
processing the signals emanating from the electrical source to determine the relative location of the electrical source;
delivering electrical energy to the at least one active electrode;
acquiring from the passive electrodes the signals emanating from the at least one active electrode;
processing the signals emanating from the at least one active electrode to determine the relative location of the at least one active electrode;
positioning the at least one active electrode to localize the electrical source.
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Accused Products
Abstract
This invention involves method and apparatus for guiding ablative therapy of abnormal biological electrical excitation. In particular, it is designed for treatment of cardiac arrhythmias. In the method of this invention electrical signals are acquired from passive electrodes, and an inverse dipole method is used to identify the site of origin of an arrhytmia. The location of the tip of the ablation catheter is similarly localized from signals acquired from the passive electrodes while electrical energy is delivered to the tip of the catheter. The catheter tip is then guided to the site of origin of the arrhythmia, and ablative radio frequency energy is delivered to its tip to ablate the site.
130 Citations
42 Claims
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1. A method for localizing an electrical source in the body comprising:
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placing passive electrodes on the body;
placing at least one active electrode in the body;
acquiring from the passive electrodes signals emanating from the electrical source;
processing the signals emanating from the electrical source to determine the relative location of the electrical source;
delivering electrical energy to the at least one active electrode;
acquiring from the passive electrodes the signals emanating from the at least one active electrode;
processing the signals emanating from the at least one active electrode to determine the relative location of the at least one active electrode;
positioning the at least one active electrode to localize the electrical source. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20)
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2. A method for localizing an electrical source in the body comprising:
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placing passive electrodes on the body;
placing at least one active electrode on the body;
acquiring from the passive electrodes signals emanating from the electrical source;
processing the signals emanating from the electrical source to determine the relative location of the electrical source;
delivering electrical energy to the at least one active electrode;
acquiring from the passive electrodes the signals emanating from the at least one active electrode;
processing the signals emanating from the at least one active electrode to determine the relative location of the at least one active electrode;
positioning the at least one active electrode to localize the electrical source.
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3. A method for localizing an electrical source in the body comprising:
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placing passive electrodes in the body;
placing at least one active electrode on the body;
acquiring from the passive electrodes signals emanating from the electrical source;
processing the signals emanating from the electrical source to determine the relative location of the electrical source;
delivering electrical energy to the at least one active electrode;
acquiring from the passive electrodes the signals emanating from the at least one active electrode;
processing the signals emanating from the at least one active electrode to determine the relative location of the at least one active electrode;
positioning the at least one active electrode to localize the electrical source. - View Dependent Claims (18)
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4. A method for localizing an electrical source in the body comprising:
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placing passive electrodes in the body;
placing at least one active electrode in the body;
acquiring from the passive electrodes signals emanating from the electrical source;
processing the signals emanating from the electrical source to determine the relative location of the electrical source;
delivering electrical energy to the at least one active electrode;
acquiring from the passive electrodes the signals emanating from the at least one active electrode;
processing the signals emanating from the at least one active electrode to determine the relative location of the at least one active electrode;
positioning the at least one active electrode to localize the electrical source.
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21. A method for localizing an electrical source in the body comprising:
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placing passive electrodes on the body;
placing at least one active electrode in the body;
acquiring from the passive electrodes signals emanating from the electrical source;
processing the signals emanating from the electrical source to determine the relative location of the electrical source at a multiplicity of time epochs during the cardiac cycle, wherein the processing involves fitting the signals to a moving dipole model;
delivering electrical energy to the at least one active electrode;
acquiring from the passive electrodes the signals emanating from the at least one active electrode;
processing the signals emanating from the at least one active electrode to determine the relative location of the at least one active electrode, wherein the processing involves fitting the signals to a moving dipole model; and
positioning the at least one active electrode to localize the electrical source at one of the time epochs, wherein at least one criterion is used to choose the time epoch; and
wherein the delivering step, the second acquiring step, the second processing step, and the positioning step are performed iteratively.- View Dependent Claims (22)
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23. An apparatus for localizing an electrical source within the body comprising:
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at least one passive electrode adapted for placement on the body;
at least one active electrode adapted for placement in the body;
a signal generator for delivering electrical energy to the at least one active electrode; and
a computer for processing the signals emanating from the electrical source and the at least one active electrode to determine the relative location of the electrical source and the relative location of the at least one active electrode. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
an isolation amplifier for isolating the signals acquired from the passive electrodes; and
an amplifier bank for amplifying the signals acquired from the passive electrodes;
a low-pass filter for identifying the signals originating from the electrical source;
a lock-in amplifier for identifying the signals emanating from the at least one active electrode;
a catheter, wherein the at least one active electrode is located on the catheter;
a source of ablative energy for delivery in the vicinity of the at least one active electrode, wherein the ablative energy is delivered through the catheter; and
a display.
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24. An apparatus for localizing an electrical source within the body comprising:
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at least one passive electrode adapted for placement on the body;
at least one active electrode adapted for placement on the body;
a signal generator for delivering electrical energy to the at least one active electrode; and
a computer for processing the signals emanating from the electrical source and the at least one active electrode to determine the relative location of the electrical source and the relative location of the at least one active electrode.
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25. An apparatus for localizing an electrical source within the body comprising:
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at least one passive electrode adapted for placement in the body;
at least one active electrode adapted for placement on the body;
a signal generator for delivering electrical energy to the at least one active electrode; and
a computer for processing the signals emanating from the electrical source and the at least one active electrode to determine the relative location of the electrical source and the relative location of the at least one active electrode.
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26. An apparatus for localizing an electrical source within the body comprising:
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at least one passive electrode adapted for placement in the body;
at least one active electrode adapted for placement in the body;
a signal generator for delivering electrical energy to the at least one active electrode; and
a computer for processing the signals emanating from the electrical source and the at least one active electrode to determine the relative location of the electrical source and the relative location of the at least one active electrode.
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Specification