Catheter equipped with a dilation element

A catheter equipped with a dilatation element comprising,

• an inner tube having a first lumen open at the distal end;
• an outer tube which surrounds the inner tube so that a predetermined length of the distal end of the inner tube extends out of the distal end of the outer tube and a second lumen is formed between the inner surface of the outer tube and the outer surface of the inner tube;
• a foldable dilatation element which has the front and rear end portions attached to the inner tube and the outer tube respectively and whose internal space communicates with the second lumen;
• a first opening which communicates with the first lumen at the proximal end of the inner tube;
• and a second opening which communicates with the second lumen at the proximal end of the outer tube:
• a fixing member inserted between the outer tube and the inner tube at a position a certain distance from the distal end of the outer tube toward the proximal end thereof,
• the outer tube is fixed to the inner tube without blocking the second lumen by the fixing member, and the distal end portion of the outer tube is not fixed to the inner tube.