Medical stent and stent delivery device

A medical stent comprising:

• a resin main body that includes a distal end and a proximal end and is formed in a tubular shape along a longitudinal axis between the distal end and the proximal end;
• a first flap including a first fixed end fixed to a distal end side of the main body and a first free end positioned outward of an outer circumferential surface of the main body in a radial direction of the main body, the first flap extending from the first fixed end to the first free end;
• a second flap including a second fixed end fixed to a proximal end side of the main body and a second free end positioned outward of the outer circumferential surface of the main body in the radial direction of the main body, the second flap extending from the second fixed end to the second free end;
• and
• a reinforcing material made of metal that extends spirally around the longitudinal axis of the main body between the distal end and the proximal end of the main body and is embedded between an inner circumferential surface of the main body and the outer circumferential surface of the main body,
• wherein the reinforcing material includes
• a first portion spirally wound at a position between the first fixed end and the second fixed end,
• a second portion that is connected to the first portion at a position between the first fixed end and the second fixed end, and is spirally wound toward the second fixed end at a pitch larger than a pitch of the first portion, and
• a third portion that is connected to the second portion, and is positioned between the proximal end of the main body and the second fixed end, the third portion being spirally wound at a pitch larger than the pitch of the second portion.

A stent delivery device comprising:

• a guide catheter including
• a guide tube through which a guide wire can be inserted, and
• a wire connected to the guide tube;
• a pusher catheter including a first tube having a first lumen through which the wire can be inserted, and a second tube having a second lumen connected to a distal end of the first lumen and through which the guide tube can be inserted;
• a connecting member including a loop that is connected to a distal end of the pusher catheter;
• and
• a stent configured to be attached to an outer circumferential surface of the guide tube and positioned distal of a distal end of the second tube,
• wherein
• the stent includes
• a resin main body that includes a distal end and a proximal end and is formed in a tubular shape along a longitudinal axis between the distal end and the proximal end,
• a first flap including a first fixed end fixed to a distal end side of the main body and a first free end positioned outward of an outer circumferential surface of the main body in a radial direction of the main body, the first flap extending from the first fixed end to the first free end,
• a second flap including a second fixed end fixed to a proximal end side of the main body and a second free end positioned outward of the outer circumferential surface of the main body in the radial direction of the main body, the second flap extending from the second fixed end to the second free end, and
• a reinforcing material made of metal that extends spirally around the longitudinal axis of the main body between the distal end and the proximal end of the main body and is embedded between an inner circumferential surface of the main body and the outer circumferential surface of the main body, the reinforcing material including
• a first portion spirally wound at a position between the first fixed end and the second fixed end,
• a second portion that is connected to the first portion at a position between the first fixed end and the second fixed end, and is spirally wound toward the second fixed end at a pitch larger than a pitch of the first portion, and
• a third portion that is connected to the second portion, and is positioned between the proximal end of the main body and the second fixed end, the third portion being spirally wound at a pitch larger than the pitch of the second portion,
• the main body has a through hole that opens on the outer circumferential surface between the proximal end and the second fixed end, and
• the stent is configured to be positioned with respect to the pusher catheter by inserting the guide tube into the loop of the connecting member in a state in which the loop is inserted into the through hole in the main body of the stent.