In some embodiments, an electrosurgical device comprises an electrically conductive elongate member for traversing body vasculature defining a hollow lumen with one or more apertures at or near its distal end, wherein electrical energy can flow through the wall of the elongate member； and an energy delivery device in electrical communication with the elongate member located at or about the distal end of the elongate member. The energy delivery device includes an electrode for delivering energy, and a thermal shield positioned between the electrode and the elongate member.
