from a two layer tubing comprising selar and pet polyethylene terapthalate as described in u s pat no 5 195 969 issued to wang et al on mar 23 1993 and in u s ser no 07 943 977 filed by sahatjian on sep 11 1993 which are assigned to the assignee of the present application the entire disclosures of which are herein incorporated by reference the balloon is mounted on the balloon segment 36 of the catheter shaft by bonding the proximal and distal sleeves 40 and 38 respectively of the balloon to the outside wall of the shaft in one embodiment the balloon has a profile of about 3 cm and a length of about 2 7 cm referring to fig3 proximal segment 16 of shaft 18 has a single lumen 42 extending therethrough the space between the inside wall of segment 16 of the shaft and the outside surface of the stylet is used for communicating inflation fluid e g radiopaque liquid between the hub 14 and a lumen 44 of segment 22 of the catheter shaft as shown in fig4 there is a 5 mm transition region 46 between the single lumen and triple lumen segments of the shaft during.