Endocardial mapping system
AssigneeEndocardial Therapeutics, Inc.
InventorsGraydon E. Beatty, Jonathan Kagan, Jeffrey R. Budd
Life of this patent
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Abstract
An array of electrode sites are placed in a heart chamber. The shape of the chamber and the location of the electrodes is determined via impedance plethysmography. Electrical measurements taken from the electrode array and referenced to a surface contacting electrode is used to generate a three-dimensional map of electrical activity. A two-dimensional map of the electrical activity within the endocardial surface is also computed.
Claims4
A method of mapping a volumetric electrical potential distribution of a heart chamber arising from electrical activation in a myocardium comprising the steps of:
- a) positioning an electrode array within the endocardial cavity;
- b) positioning a reference electrode at the interior surface of said heart chamber at a known distance from said array, said reference electrode and said array together defining an endocardine reference position;
- c) measuring volume and shape of said heart chamber, and generating volume measurement data from the volume and shape measurements;
- d) computing the position of said array, from said volume measurement, and from said endocardial reference position, and generating array position measurement data;
- e) measuring electrical potentials on said array, and generating electrical potential measurement data from the electrical potential measurements;
- f) computing the three-dimensional volumetric electrical field distribution of said heart chamber volume from a spherical harmonic series expression containing said electrical potential measurements, and said array position measurement data;
- and
- g) displaying said volumetric electrical field distribution.
A method of mapping a two-dimensional electrical potential distribution within a wall of a heart chamber arising from electrical activation in a myocardium comprising the steps of:
- a) positioning an electrode array within the endocardial cavity;
- b) positioning a reference electrode at the interior surface of said heart chamber at a known distance from said array, said reference electrode and said array together defining an endocardial reference position;
- c) measuring volume and shape of said heart chamber, and generating volume measurement data from the volume and shape measurements;
- d) computing the position of said array, from said volume measurement, and from said endocardial reference position, and generating array position measurement data;
- e) measuring the electrical potentials on said array, and generating electrical potential measurement data from the electrical potential measurements;
- f) computing a three-dimensional volumetric electrical field distribution of said heart chamber volume from a spherical harmonic series expression containing said electrical potential measurement data, and said array position measurement data;
- g) defining a set of computed potential points on the wall of said heart chamber;
- h) inerting an intramural electrode into said wall defining a subsurface electrode site and, generating a subsurface voltage measurement, from said subsurface electrode site;
- i) computing a two-dimensional potential distribution from a center of gravity calculation from said computed potential points from step g) and from said subsurface voltage measurement from step h), and generating two-dimensional map data from the two dimensional potential distribution;
- and
- j) displaying a two-dimensional potential distribution map from said two-dimensional map data.
Dependencies are inferred from the claim text.