Balloon detachment tool

A balloon detachment tool comprising:

• a cylindrical holding portion including a first opening on one end side in an axial direction, the first opening having an inner diameter that allows an ultrasound transducer unit in a distal end of an insertion portion of an ultrasound endoscope to be inserted and extracted, and a second opening on another end side in the axial direction;
• a first balloon engagement groove formed in an outer periphery of the holding portion, the first balloon engagement groove being at a position a set distance away toward the other end side in the axial direction from the one end, the first balloon engagement groove being engageable with an end portion of the balloon which is removed from a second balloon engagement groove provided in an outer periphery of the ultrasound transducer unit;
• a cut portion provided in the holding portion, the cut portion allowing the holding portion to radially expand in a radial direction;
• and
• an abutment portion provided on an inner peripheral face of the holding portion and on the second opening side relative to the first balloon engagement groove in the axial direction, the abutment portion positioning the first balloon engagement groove so that the first balloon engagement groove is located on a distal end side of the insertion portion of the ultrasound endoscope relative to the second balloon engagement groove when the abutment portion is brought into abutment with the distal end of the insertion portion of the ultrasound endoscope.