Closed suction catheter

A closed suction catheter, comprising:

• a tube (10) covered with a flexible outer skin (20);
• a suction controller (30) provided at a first end of the tube (10) and controlling a suction pressure;
• and
• a connection adaptor (40) provided at a second end of the tube (10),
• wherein the suction controller (30) includes a main body (31) connected to the flexible outer skin (20) by a coupling ring (32), the main body (31) including:
• two tube holes (311 and 312) formed in the main body (31) such that the tube (10) passes through the main body (31);
• a longitudinal groove (313) formed at a position between the two tube holes (311 and 312), with a roller (33) installed in the longitudinal groove (313);
• a guide portion (315) formed on a side wall (314) of the longitudinal groove (313) and guiding movement of the roller (33);
• and a bottom surface (316) inclinedly formed at the main body (31) with the tube (10) placed on the bottom surface (316) such that when the roller (33) moves from a first end to a second end of the main body (31), the roller (33) presses the tube (10) to close the tube (10), and when the roller (33) moves from the second end to the first end of the main body (31), the tube (10) is opened, whereby an opening ratio of the tube (10) is controlled by the roller (33) provided at the main body (31).