The present invention relates to a medical device comprising an expandable electrode assembly reciprocally movable between a first configuration and a second configuration. The expandable electrode assembly includes a first plurality of longitudinally extending legs formed in a first partially tubular member, a second plurality of longitudinally extending legs formed in a second partially tubular member, and a first endpiece formed by first ends of the first and second partially tubular members as well as a second endpiece formed by second ends of the first and second partially tubular members, wherein a portion of the second partially tubular member is configured to be received in a portion of the first partially tubular member.
