A transporting rail unit includes a first driving mechanism driving the object to a first position on a rail. The devices generally involve tissue stabilizers having at least one multiple link support member operably connecting a stabilizer foot to a retractor. The retraction mechanism is used to automatically retract and extend the flexible members as the base is pivoted between a retracted position and a deployed position on the blade. The fins extend upwardly from the heat-spreading surface. The upper electrode 105 includes an upper base 105a made of a dielectric material, and a plurality of fine holes A having a diameter equal to or less than twice a thickness of a sheath are formed in the upper base 105a.