Abstract: A stent delivery system includes a stent; a pusher catheter disposed at a proximal-end side thereof; and a collet chuck disposed at the proximal-end side of the pusher catheter. The collet chuck includes a collet disposed along an outer circumference of a guide catheter; and a chuck nut provided to be relatively advanceable and retractable with respect to the collet and into which the guide catheter is insertable, and an inner circumferential surface of the chuck nut facing a center axis of the guide catheter includes a first region tightens the collet to make the collet to approach the center axis as coming into contact with the collet while approaching the collet; and a second region being at an opposite side of the collet with respect to the first region for making an approaching amount of the collet to be smaller than that in the first region.

Abstract: An endoscope treatment tool includes: a sheath; a clip unit; a biasing member arranged between a distal end part of the sheath and the clip unit; and a first rotation preventing part capable of preventing the clip unit from rotating relative to the distal end part of the sheath about a longitudinal axis. The clip unit includes: a clip body; a holding tube; and a second rotation preventing part capable of preventing the clip body from rotating relative to the holding tubes about the longitudinal axis. The biasing member biases the holding tube so as to separate from the distal end part of the sheath. When a proximal end part of the holding tube comes into contact with the distal end part of the sheath against the biasing force of the biasing member, the first rotation preventing part prevents the relative rotation of the clip unit.

Abstract: An endoscope treatment tool includes: a tubular sheath part; an operation wire; an arm member; a holding tube; and a biasing member. The sheath part includes an elongated body part, and a tubular member. In a state where the holding tube and the tubular member are in contact with each other, the holding tube and the tubular member are connected to each other so as not to be rotated relative to each other about an axis and to be movable relative to each other in a direction in which a central axis of the sheath part extends. The arm member and the holding tube have a rotation restricting structure that prevents the arm member from rotating about an axis of the holding tube in a state where the arm member is in contact with the holding tube against the biasing force of the biasing member.

Abstract: An endoscope treatment tool includes: a sheath; a clip unit; a biasing member arranged between a distal end part of the sheath and the clip unit; and a first rotation preventing part capable of preventing the clip unit from rotating relative to the distal end part of the sheath about a longitudinal axis. The clip unit includes: a clip body; a holding tube; and a second rotation preventing part capable of preventing the clip body from rotating relative to the holding tubes about the longitudinal axis. The biasing member biases the holding tube so as to separate from the distal end part of the sheath. When a proximal end part of the holding tube comes into contact with the distal end part of the sheath against the biasing force of the biasing member, the first rotation preventing part prevents the relative rotation of the clip unit.

Abstract: An endoscope treatment tool includes: a tubular sheath part; an operation wire; an arm member; a holding tube; and a biasing member. The sheath part includes an elongated body part, and a tubular member. In a state where the holding tube and the tubular member are in contact with each other, the holding tube and the tubular member are connected to each other so as not to be rotated relative to each other about an axis and to be movable relative to each other in a direction in which a central axis of the sheath part extends. The arm member and the holding tube have a rotation restricting structure that prevents the arm member from rotating about an axis of the holding tube in a state where the arm member is in contact with the holding tube against the biasing force of the biasing member.