A device to transmit energy to a body vessel has an elongate member； a basket comprising a hub and a circumferential body, the hub disposed about the elongate member, the circumferential body extending radially and distally from the hub to an open end, in an expanded state, the circumferential body having a surface such that a membrane is disposed on the surface, the membrane being substantially impermeable to blood flow such that it occludes the blood flow in the expanded state； a second conductive element being one of the basket and a return electrode disposed outside of the body vessel when the basket is in the expanded state； and a control unit which actuates the device to transmit energy to the body vessel.
