Mucous membrane lifting instrument and mucous membrane lifting method

A method of lifting a mucous membrane by operating a mucous membrane lifting instrument including a tubular hood having a proximal end attachable to a distal end of an endoscope, a first band having an elasticity, and arranged on an outer peripheral surface of the hood in a stretched state, a second band having an elasticity, and arranged on the outer peripheral surface of the hood in a stretched state at a position proximal of the first band, and a linear member that is connected to the first band and passes between the outer peripheral surface of the hood and the second band, the method comprising:

• fixing the first band to the mucous membrane by removing the first band from the hood in a state in which a part of the mucous membrane is pulled into an inner cavity in the hood;
• and
• then fixing the second band to a tube wall of a gastrointestinal tract by removing the second band from the hood in a state in which a part of the tube wall facing the mucous membrane is pulled into the inner cavity of the hood,
• wherein when the second band is fixed to the tube wall, the linear member extends from a first end connected to the first band through the second band so as to pass between the tube wall and the second band, and is supported by being sandwiched between the tube wall and the second band.