Catheter System

A catheter system configured to be inserted into a lumen of a living body and to travel along the lumen, the catheter system comprising:

• a flexible outer tube;
• an inner tube disposed in an inner cavity of the outer tube so as to be movable in an axial direction of the outer tube;
• and
• a balloon having a tubular shape that connects a distal portion of the outer tube and a distal portion of the inner tube to each other, the balloon being configured to inflate radially inward with respect to the outer tube to allow insertion of a rod-like member through the inner tube, wherein the balloon has an outer peripheral portion that touches inner periphery of the lumen when the balloon protrudes in the distal direction from the distal end of the outer tube;
• wherein the balloon comprises a protrusion or recess located at the outer peripheral portion of the balloon and configured to remove tissue in the lumen.

A catheter system configured to be inserted into a lumen of a living body and to travel along the lumen, the catheter system comprising:

• a flexible outer tube;
• an inner tube disposed in an inner cavity of the outer tube so as to be movable in an axial direction of the outer tube;
• a rod-like member comprising a swab;
• and
• a balloon having a tubular shape that connects a distal portion of the outer tube and a distal portion of the inner tube to each other, the balloon being configured to inflate radially inward with respect to the outer tube to allow insertion of the rod-like member through the inner tube, wherein the balloon has an outer peripheral portion that touches inner periphery of the lumen when the balloon protrudes in the distal direction from the distal end of the outer tube.