Blocking device and method

A blocking method using the blocking device described in 2, the blocking method comprising the steps of:

• connecting the cylinder to the fluid tube;
• introducing a tip end of the guide pipe into the fluid tube;
• advancing the slide tube toward the fluid tube and introducing the bag into the fluid tube through the notch;
• withdrawing the guide pipe from the fluid tube before expanding the bag;
• and
• expanding the bag to block the inside of the fluid tube.

A blocking device that introduces a bag into a fluid tube, and expands the bag by pressure of fluid to block the inside of the fluid tube, the blocking device comprising:

• a cylinder connectable to the fluid tube;
• a guide pipe provided to be movable forward and backward in an axial direction of said cylinder in said cylinder and formed with a notch for passing the bag at a tip end;
• a slide tube inserted into said guide pipe and provided to be movable forward and backward in the axial direction, and having a tip end portion connected to the bag and a basal end portion connected to a fluid source for expanding the bag;
• and
• a mechanical linkage having a first end connected to a joint configured to couple to the basal end on said slide tube and a second end connected to said guide pipe, wherein when the joint is connected to the basal end on said slide tube said guide pipe is withdrawn from the fluid tube,
• whereby the bag is expanded in a state in which said guide pipe is withdrawn from the fluid tube.