53 56 in the exterior surface of support member 48 recesses 55 56 are not shown in fig6 but are on the opposite side of support member 48 the longitudinal wall segments 49 52 are slit through the lumens 40 43 as best shown in fig3 5 lumens 40 43 are plugged off proximal to the split of the wall segments 49 52 this wall segment structure facilitates the manufacture of the catheter the elongated shaft may be extruded with all eight lumens 36 43 in place and the distal shaft portion 14 is segmented by cutting through lumens 40 43 by a cutting blade or other suitable cutting element the support member 48 may be slid over the central delivery tube 32 with the proximal end of the support member secured within the central lumen of the shaft 11 the free ends of the slit wall segments 49 52 are secured to the distal end of the support member 48 the balloon 15 may then be secured to the shaft 11 with wound sutures 57 and 58 further securing the ends of the balloon to the shaft the outer delivery tubes 21 24 may extend through lumens 36 39 to the distal ends of the wall segments 49 52 inflation line 17 and vacuum line 19 may likewise extend through lumens 40 and 41 to a location not shown proximal to the split of the wall segments 49 52 as best shown in fig5 7 and 8 the distal tip 12 has the distal vacuum port 45 which is in fluid communication with the annular space 46 between central delivery tube 32 and lumen 47 of support member 48 the distal tip 12 is provided with outer source lumen plugs 60 63 for plugging.