Ablation catheter tip with a buffer layer covering the electrode
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United States of America Patent
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Dec 7, 1999
Grant Date -
N/A
app pub date -
Jul 3, 1997
filing date -
Jul 3, 1997
priority date (Note) -
Expired
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Abstract
An ablative catheter assembly whose electrode is completely covered by a buffer layer. The buffer layer prevents areas of high current density at the surface of the catheter tip, which helps to reduce popping and clotting. The buffer layer may be in the form of a conductive fluid (such as saline solution) pumped into a cavity surrounding the electrode. In this case, the conductive fluid couples the electrode to the surrounding tissue so that RF energy will pass from the electrode to the tissue, thereby effecting ablation. Also, the buffer layer may be in the form of a porous coating which covers an electrode tip. In this case, blood or fluid which infuses the porous coating couples the electrode tip to the surrounding tissues to be ablated.
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