Abstract: Provided is an endoscope clip and an operation method for a clip. The clip includes a clip arm that is configured to be transitioned between a first, second and third configurations. The clip includes a slider to operate the clip arm to be transitioned between the configurations, and a limiter configured to restrict movement of the slider so as to restrict the transition of the clip arm from one configuration to another of the configurations.

Abstract: An endoscopic treatment tool comprises an elongated sheath and an elongated portion configured to be inserted in the elongated sheath and capable of being movable back and forth in directions. A loop portion is disposed on a distal end of the elongated portion and is constructed of a wire folded to form into a loop. The loop portion includes a first bent portion, a pair of second bent portions, a pair of third bent portions, and a fourth bent portion all of which are integrally formed from a distal end toward a proximal end of the loop portion. A first length that represents a length from the first bent portion to the fourth bent portion in the directions along the longitudinal axis ranges from one and half times to two times a first width that represents a maximum dimension of the loop portion in directions perpendicular to the longitudinal axis.

Abstract: An endoscopic treatment tool comprises an elongated sheath and an elongated portion configured to be inserted in the elongated sheath and capable of being movable back and forth in directions. A loop portion is disposed on a distal end of the elongated portion and is constructed of a wire folded to form into a loop. The loop portion includes a first bent portion, a pair of second bent portions, a pair of third bent portions, and a fourth bent portion all of which are integrally formed from a distal end toward a proximal end of the loop portion. A first length that represents a length from the first bent portion to the fourth bent portion in the directions along the longitudinal axis ranges from one and half times to two times a first width that represents a maximum dimension of the loop portion in directions perpendicular to the longitudinal axis.

Abstract: A treatment instrument is that a maximum dimension of the loop portion in a direction orthogonal to the longitudinal axis in a state where half of a total length of the loop portion in a direction of the longitudinal axis of the loop portion is pulled into the sheath is 40% to 60% of a maximum dimension of the loop portion in the orthogonal direction in a state where the whole loop portion protrudes from a distal end of the sheath.

Abstract: A treatment instrument is that a maximum dimension of the loop portion in a direction orthogonal to the longitudinal axis in a state where half of a total length of the loop portion in a direction of the longitudinal axis of the loop portion is pulled into the sheath is 40% to 60% of a maximum dimension of the loop portion in the orthogonal direction in a state where the whole loop portion protrudes from a distal end of the sheath.