Abstract: A stent delivery apparatus includes a guide catheter through which a guide wire is inserted, a pusher catheter including a first lumen through which the guide catheter is inserted and a first communication hole communicating with the first lumen, a stent including a second lumen through which the guide catheter is inserted and a second communication hole communicating with the second lumen and disposed on a distal side of the pusher catheter, and a thread that connects the stent and the pusher catheter to each other in a releasable manner, wherein the thread has a first end portion that through the first communication hole, an intermediate portion that through the second communication hole, and a second end portion that extends around a part of the guide catheter located between a proximal end of the stent and a distal end of the pusher catheter.

Abstract: A stent delivery device that can be inserted into an endoscope. The device includes a guide catheter including a guide tube, an operating wire, and a joint portion that joins the guide tube and the wire. The device also includes a pusher catheter including a first tube through which the wire is inserted and a second tube through which the guide tube is inserted. The device may include a bite prevention portion that can prevent the wire from biting into an inner surface of the second tube. In a state where a distal end of the pusher catheter protrudes from the endoscope channel and the channel includes a curved portion in a curved state, a proximal end of the guide tube, which includes the joint portion, and/or the bite prevention portion can be positioned proximal of a proximal end of the curved portion in the endoscope channel.

Abstract: A medical stent including: a tubular main body made of resin that extends along an axis; a first locking member including a first fixed end fixed to the distal end side of the main body, and a first free end positioned radially outward of the main body; a second locking member including a second fixed end fixed to the proximal end side of the main body, and a second free end positioned radially outward of the main body; and a spiral reinforcing material made of metal which is embedded between the inner and outer circumferential surfaces of the main body. The reinforcing material includes a first portion spirally wound between the first and second fixed ends, a second portion spirally wound at a pitch greater than that of the first portion, and a third portion spirally wound at a pitch greater than that of the second portion.