Systems and methods for authenticating subscribers of video signals are disclosed. Such determination is performed by whether or not the copyright protecting function of the connected TV device satisfies a condition set in advance. Placement of a stent, endoprosthesis or mere circuit interrupting structure into a target pulmonary vein, without ablation, prevents aberrant electrical activity in the pulmonary veins from interfering with the electrical activity of the left atrium. The opposing end of the head section is pivotally connected to the main middle section, which is pivotally connected to the secondary middle section, which is pivotally connected to the opposing end of the foot section. The light source also preferably includes a plurality of heat pipes having heat radiating fins on the heat radiating portions thereof.