The apparatus and method includes a proximal balloon subsystem including a proximal balloon positionable to a selected first location within a blood vessel to be ablated. A distal balloon subsystem including a distal balloon is positionable to a selected second location within the blood vessel to be ablated. An ablating subsystem including an ablating element is configured to be positioned between the proximal balloon and the distal balloon within the blood vessel to be ablated. An evacuation port is configured to evacuate fluid between the proximal balloon and the distal balloon.
