Atrial ablation catheter adapted for treatment of septal wall arrhythmogenic foci and method of use

Abstract

An atrial ablation catheter with an electrode array particularly adapted to locate and ablate foci of arrhythmia which are required for sustained atrial fibrillation is provided. The array is easily deployed and retracted from the catheter, and presents a proximally oriented electrode array that can be pulled against the septal wall of the left atrium to engage the septal wall.

Description

[0001] This application is a continuation-in-part of U.S. patent application Ser. No. 10 / 997,713 filed Nov. 24, 2004.FIELD OF THE INVENTIONS [0002] The inventions described below relate the field of atrial ablation. BACKGROUND OF THE INVENTIONS [0003] Atrial fibrillation is a form of arrhythmia, or irregular heartbeat, in which the atria (the two small upper chambers of the heart) quiver instead of beating effectively. While there are a number of variations of atrial fibrillation with different causes, they all involve irregularities in the transmission of electrical impulses through the heart. As a result of abnormalities in the heart's electrical impulses, the heart is not able to pump the blood out properly, and it may pool and clot. If a blood clot moves to an artery in the brain, AF can lead to stroke. AF is also associated with increased risks of congestive heart failure and cardiomyopathy. These risks warrant medical attention for patients with AF even if the symptoms are mil...

AI Technical Summary

Benefits of technology

[0005] The devices and methods described below provide for a simplified approach to the treatment of atrial fibrillation with substantially improved efficacy and outcomes in patients with paroxysmal or persistent atrial fibrillation, especially for those arrhythmia originating from, or sustained by, arrhythmogenic foci located on the septal wall of the left atrium. An endocardial catheter with an electrode array particularly adapted to locate and ablate foci of arrhythmia which are required for sustained atrial fibrillation is provided. The array is easily deployed and retracted from the catheter, and presents a proximally oriented electrode array that can be pulled against the septal wall of the left atrium to engage the septal wall. A control system comprising an ECG analyzer and a RF power supply operates to analyze electrical signals obtained from the electrode array, determine if an arrhythmogenic focus is present in the area covered by the array, and supply RF power to appropriate electrodes to ablate the focus.

Problems solved by technology

As a result of abnormalities in the heart's electrical impulses, the heart is not able to pump the blood out properly, and it may pool and clot.

If a blood clot moves to an artery in the brain, AF can lead to stroke.

AF is also associated with increased risks of congestive heart failure and cardiomyopathy.

Atrial fibrillation is the most common sustained heart rhythm disorder and increases the risk for heart disease and stroke, both leading causes of death in the United States.

The Cox-Maze procedure and linear ablation procedures are tedious and time-consuming, taking up to several hours to accomplish endocardially.

Circumferential ablation is proving to lead to rapid stenosis and occlusion of the pulmonary veins, and of course is not applicable to treatment of the septal wall of the left atrium.

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