A method of retrieving calculus in a living body and relocating the calculus to a different location in the living body involves positioning an elongated member in the living body in which the calculus is located, drawing the calculus in the living body toward the elongated member while the elongated member is positioned in the living body so that the calculus is retained by the elongated member； moving the elongated member so that the elongated member is located at a position in the living body that is different from the position of the elongated member in the living body during the drawing of the calculus toward the elongated member； and releasing the calculus from the elongated member so that the calculus is at a position in the living body different from a location of the calculus in the living body while the calculus is being drawn toward the elongated member.
