Optional small intestine extension (Semi-difficult version) for LM107

Features:
- Practical training for the double balloon method can be performed
- Practical training for the single balloon method can be performed
- Using each type of balloon enteroscopy, insertion into the large and small intestine and shortening technique can be performed
- The small intestine has a total length of 120 cm and contains an internal scale with intervals of 30 cm to enable the user to confirm the length of insertion
- The level of difficulty of inserting the enteroscope into the small intestine can be changed (Two types)

Semi-difficult version.