Patent ID: 9675411
Date: 2017-06-13
CPC Classifications: A61B,A61N,Y10T

Claim:
1. A medical device, comprising: an insertion tube, having a distal end for insertion into a body of a subject at a treatment area; a conductive hollow distal tip including a cylindrically shaped outer surface having a diameter and a circumference and defining a longitudinal axis and proximal and distal ends, and a planar end cap integrated along the distal end, the planar end cap having a planar section that extends across the diameter of the cylindrically shaped outer surface to enclose an interior space, the planar end cap is configured to be substantially perpendicular to the longitudinal axis, which conductive hollow distal tip is fixed to the distal end of the insertion tube and is coupled to a generator and is configured to directly apply energy to tissue at the treatment area inside the body, and wherein the conductive hollow distal tip has a distribution of perforations therethrough, and wherein there are at least 50 perforations in the distribution of perforations and at least a portion of the at least 50 perforations are circumferentially and longitudinally arranged over the cylindrically shaped outer surface of the hollow distal tip, wherein each perforation of the distribution of the at least 50 perforations is not greater than 0.2 mm in diameter; and a lumen passing through the insertion tube and coupled to deliver a cooling fluid to the tissue at the treatment area via the perforations, the distribution of the at least 50 perforations is configured to ensure equal flow of the cooling fluid while not overloading the treatment area with the cooling fluid; wherein the cylindrically shaped outer surface has edges along the circumference of the proximal and distal ends, wherein the edges are rounded and configured to avoid concentration of an electric field around the edges.