Patent ID: 8414575
Filing Date: 2013-04-09
Classification: A61B

Abstract:
1. An electrosurgical device for tissue ablation, comprising: a delivery cannula having a lumen and an open distal end in communication with the lumen; a mandrel disposed in the lumen of the delivery cannula, the mandrel being axially moveable relative to the cannula; a plunger mounted on a proximal end of the mandrel, the plunger being configured for electrical connection to a radiofrequency power generator; a first set of electrode tines having proximal ends attached to and displaced circumferentially around a distal portion of the mandrel, the first set of electrode tines disposed a first radial position; a second set of electrode tines having proximal ends attached to and displaced circumferentially around a distal portion of the mandrel, the second set of electrode tines disposed at a second radial position located radially outward with respect to the first radial position; and wherein the second set of electrode tines are centered approximately evenly between a pair of electrode tines of the first set, the second set of electrode tines at least partially overlapping the first set of electrode tines when the first and second set of electrode tines are retracted into the lumen of the delivery cannula.