portion 28 is sufficiently rigid for good pushability of the shaft through and out of a distal opening of the endoscope the distal portion 26 of the shaft 24 is about 1 6 french the occluding balloon when inflated is larger than the working channel of the endoscope and is typically about 8 french a suitable endoscope is the olympus lf tp bronchoscope alternatively or in addition to the use of the occluding member 46 airways adjacent the delivery airway can be obstructed for example with a fluid such as saline the fluid in the adjacent airways prevents condensable vapor 12 from entering into other lung regions which are not targeted for treatment and prevents damage of the adjacent regions preferably the vapor generator 34 as shown in fig5 a is external to the elongate shaft 24 and stores the liquid supply the vapor generator 34 has an outer housing 72 which houses internal structures including a liquid chamber 74 and an inner vapor conduit 76 liquid may be loaded directly into the liquid chamber the inner vapor conduit 76 extends from the liquid chamber 74 of the vapor generator 34 to the proximal portion 28 of the first lumen 32 and receives the condensable vapor 12 from the liquid chamber 74 a via an inlet port 78 the vapor generator 34 couples to the elongate shaft 24 via a luer fitting or similar mechanism the liquid chamber 74 has heating elements such as resistive heating elements or a rf heater or the like for vaporizing liquid inside the liquid chamber to a condensable vapor.