Method of inserting treatment tool

1. A method of inserting a treatment tool, comprising:

making a puncture needle project from a first channel of an endoscope at a first raised angle with respect to a longitudinal axis of the endoscope and puncturing an upper digestive tract to place a distal end of a needle tube of the puncture needle inside a biliary tract while observing an ultrasound image;

inserting a guide wire into the biliary tract via the needle tube and making a distal end of the guide wire extend out from a duodenal papilla into a duodenum;

placing a distal end portion of the endoscope in vicinity of the duodenal papilla while keeping the distal end of the guide wire extending out from the duodenal papilla while observing a captured image;

pulling a first end portion of the guide wire extending out from the duodenal papilla into a second channel of the endoscope at a second raised angle with respect to the longitudinal axis of the endoscope, the second raised angle being larger than the first raised angle; and

inserting the treatment tool inside the biliary tract via the guide wire.

2. The method of inserting the treatment tool according to claim 1 , wherein

the treatment tool is cylindrical-shaped, and

inserting the cylindrical-shaped treatment tool inside the biliary tract includes inserting the cylindrical-shaped treatment tool at least up to a position of the biliary tract including a stenosis portion.

3. The method of inserting the treatment tool according to claim 1 , wherein making the distal end of the guide wire extend out from the duodenal papilla into the duodenum includes making the guide wire extend until an extending amount of the guide wire from the duodenal papilla becomes equal to or more than a moving amount of the distal end portion of the endoscope to move from a position punctured with the puncture needle to the duodenal papilla.

4. The method of inserting the treatment tool according to claim 1 , wherein making the distal end of the guide wire extend out from the duodenal papilla into the duodenum includes making the guide wire extend until an extending amount of the guide wire extending from the distal end portion of the endoscope into the duodenum becomes equal to or more than a moving amount of the distal end portion of the endoscope.

5. The method of inserting the treatment tool according to claim 1 , wherein pulling the first end portion of the guide wire into the second channel includes pulling the first end portion of the guide wire until a second end portion of the guide wire which is opposite to the first end portion is placed inside the biliary tract.

6. The method of inserting the treatment tool according to claim 1 , wherein pulling the first end portion of the guide wire into the second channel includes pulling the first end portion of the guide wire until a second end portion of the guide wire which is opposite to the first end portion is placed inside the upper digestive tract.

7. The method of inserting the treatment tool according to claim 1 , wherein pulling the first end portion of the guide wire into the second channel includes pulling the first end portion of the guide wire until a second end portion of the guide wire which is opposite to the first end portion is placed inside the endoscope.

8. The method of inserting the treatment tool according to claim 1 , wherein

the first raised angle is 20 to 40 degrees; and

the second raised angle is 60 to 120 degrees.

9. The method of inserting the treatment tool according to claim 1 , wherein the endoscope includes an ultrasound transducer unit at the distal end portion.

10. The method of inserting the treatment tool according to claim 1 , wherein the guide wire extending out from the duodenal papilla is pulled into the second channel by gripping the guide wire with a gripping forceps inserted into the second channel.

11. The method of inserting the treatment tool according to claim 2 , wherein the cylindrical-shaped treatment tool is inserted up to the position of the biliary tract including the stenosis portion via the guide wire pulled into the second channel.

12. The method of inserting the treatment tool according to claim 2 , wherein the cylindrical-shaped treatment tool is a stent.