lobe 71 a through aperture 64 a and communicates with the interior of lobe 71 c through aperture 64 b cooling fluid exhaust lumen 66 communicates with the interior of lobe 71 b through aperture 66 a and cooling fluid exhaust lumen 67 communicates with the interior of lobe 71 b through aperture 67 a cooling fluid intake lumen 64 and exhaust lumens 66 and 67 cooperate with cooling system 36 via ports 46 and 48 of handle 30 to provide a selectively controlled flow of fluid through cooling lumens 64 66 and 67 during a treatment session in operation cooling fluid flows from cooling system 36 to cooling fluid feed line 94 b and on through port 46 of handle 30 into cooling fluid intake lumen 64 the cooling fluid continues to flow under dynamic fluid pressure through apertures 64 a and 64 b to inflate lobes 71 a and 71 c of multi lobe balloon 71 cooling fluid flows from lobe 71 b through apertures 66 a and 67 a into cooling fluid exhaust lumens 66 and 67 and exits shaft 32 at distal end 50 thereof through port 48 of handle 30 and on through cooling fluid return line 96 b and manifold 35 to cooling system 36 for re chilling and recirculation cooling fluid feed line 96 b and return line 96 b are each provided with a conventional quick coupling fitting 65 a and 65 b respectively which permits catheter 28 to be easily disconnected from cooling system 36 in an exemplary embodiment the cooling fluid is deionized water provided by cooling system 36 chilled to an appropriate temperature so as to maintain the temperature of tissue.