Medical balloon catheter and manufacturing method of medical balloon catheter

A medical catheter, comprising:

• a multi-lumen tube including a first lumen and a second lumen;
• an extension tube fixed to a first end surface in a longitudinal direction of the multi-lumen tube, extending from the first end surface along the longitudinal direction, and including a third lumen communicating with the first lumen;
• and
• an outer wall portion extending from the multi-lumen tube along the extension tube and configured to cover a part of an outer surface of the extension tube, the outer wall portion including a pipeline formed to communicate with the second lumen and having a part of the outer surface in an inner surface of the pipeline:
• and
• a balloon fixed to at least one of the multi-lumen tube, the extension tube, and the outer wall portion,
• wherein the outer wall portion having second and third end surfaces each extending in the longitudinal direction and each directly contacting the outer surface of the extension tube,
• an internal space of the balloon is formed to surround the extension tube and the internal space communicates with the second lumen through the pipeline, and
• the balloon includes a proximal-end tail fixed to at least the outer wall portion, and a distal end of the outer wall portion is disposed at an inner side of the proximal-end tail.