Abstract: The stent delivery system includes: an outer tube in which a first opening is formed in a distal end and a second opening is formed between the distal end and a proximal end; an inner tube inserted into the outer tube from the first opening to the second opening, and disposed outside of the outer tube from the second opening to the proximal end of the outer tube; and a stent stored between the inner tube and the outer tube. The outer tube and the inner tube are configured to be inserted into a channel of an endoscope. The second opening is formed at a position where the second opening is arranged inside the channel when a storage position is protruded from a distal end side of the channel.

Abstract: A stent delivery system includes: a first outer tube; a second outer tube disposed at a proximal side from the first outer tube; an inner tube connected to a distal end part of the second outer tube and configured to be inserted into the first outer tube; a traction member connected to a proximal end part of the first outer tube and configured to be inserted into the second outer tube; and a stent housed between the inner tube and the first outer tube. The surface roughness of an outer surface of the second outer tube is higher than the surface roughness of an outer surface of the first outer tube.