[Problem] To provide a balloon catheter capable of expanding a luminal organ such as a blood vessel without dissociation or recoil and of preventing restenosis of the luminal organ over a long period. [Solution] Because thermoplastic collagen, which is the main component of the matrix of luminal organs, is softened and extended by evenly heating a balloon (6) that is set at the tip of the catheter using a high frequency generator (21) and a vibration generator (32) while pressurizing the balloon (6) using a syringe (31), the blood vessel is expanded without dissociation or recoil of the luminal organ. And because an intima proliferation-inhibiting substance (42) is added to the surface of the balloon (6) with a biodegradable thermoplastic substance (41) as a base material, when the surface of the balloon (6) is heated, the biodegradable thermoplastic substance (41) melts and releases the intima proliferation-inhibiting substance (42), which is absorbed into the inner wall of the luminal organ. Restenosis due to intima proliferation can be prevented over a long period as a result of the drug effects. Moreover, even if the biodegradable thermoplastic substance (41) flows from the surface of the balloon (6) into the body, it is degraded in the body and causes few complications.Linvention a pour but de proposer un cathéter à ballonnet apte à expanser un organe luminal tel quun vaisseau sanguin sans dissociation ni recul et à prévenir une resténose de lorgane luminal sur une longue durée. En raison du fait que le collagène thermoplastique, qui est le composant principal de la matrice dorganes luminaux, est assoupli et allongé par chauffage uniforme dun ballonnet (6) qui est disposé à la pointe du cathéter à laide dun générateur haute fréquence (21) et dun générateur de vibration (32) tout en pressurisant le ballonnet (6) à laide dune seringue (31), le vaisseau sanguin est expansé sans dissociation ni recul de lorgane luminal. Et en raison du fait quune substance inhibant
