Patent ID: 9539047
Date: 2017-01-10
CPC Classifications: A61B,A61M

Claim:
1. A method for ablating tissue that is located radially outward from an interior surface of an interior wall of a target vessel of a human body, the method including: providing a tissue ablation catheter having a proximal end and a distal end, the tissue ablation catheter comprising three or more needle guiding elements through which three or more injection needles are advanced, the three or more needle guiding elements and the three or more injection needles being located at a distal portion of the tissue ablation catheter; advancing the distal portion of the tissue ablation catheter to a site within the target vessel where tissue ablation is to be performed; advancing the three or more needle guiding elements to expand outwardly against the interior surface of the target vessel; advancing the three or more injection needles through the three or more guiding elements and into the interior wall of the target vessel; and injecting an ablative fluid through the three or more injection needles into an adventitia of the target vessel creating three or more ablative fluid zones, wherein the ablative fluid zones intersect to form an ablation ring around the circumference of, and outside the interior surface of the target vessel; and wherein the ablative fluid is injected in a region that is more than 2 mm beyond the interior surface of the target vessel.