Abstract: A rotation transmission structure includes a coil body formed by winding wires, and a reinforcing body for connecting adjacent wires of the coil body. When the wires of the coil body are connected to one another by the reinforcing body, the rigidity of a predetermined region of the rotation transmission structure in the longitudinal direction is lower than the rigidity of another region of the rotation transmission structure.

Abstract: A human body simulation device includes an aorta model that simulates an aorta, and a biological model that simulates a part of a human body and has a partial blood vessel model simulating a part of blood vessels. The aorta model includes a biological model connecting portion that attachably/detachably connects the biological model in a state where an inner cavity of the aorta model and an inner cavity of the partial blood vessel model are in communication with each other, and a fluid feeding portion connecting portion that connects a fluid feeding portion for feeding a fluid into the inner cavities.

Abstract: A ligation device includes a cylindrical inner cylinder having a distal end portion, a slider having a cylindrical shape, attached around the inner cylinder, movable with respect to the inner cylinder along an axial direction of the inner cylinder, and having annular grooves extending along a circumferential direction on an inner peripheral face, and ligation rings attached around the inner cylinder and located in the annular grooves.

Abstract: A ligation device includes a main body and a first ligation ring. The main body has a cylindrical shape. The main body is configured to be attached to an endoscope and to be located on a distal end portion of the endoscope. The main body includes a distal end portion configured to project from a distal end of the endoscope in a longitudinal direction of the main body and includes a first fluid feeding passage with a first opening that opens on a distal end face or an outer peripheral face of the distal end portion of the main body. The first ligation ring is attached to the distal end portion of the main body so as to obstruct the first opening.