Patent ID: 8419784

Claim:
A stent delivery device comprising: a distal-side tube having a guide wire lumen; a proximal-side tube having a distal portion fixed to a proximal portion of said distal-side tube; a cylindrical member which encloses a distal side of said distal-side tube and is slidable toward a proximal end of said distal-side tube; a stent housed in said cylindrical member; an intermediate tube which encloses a proximal side of said distal-side tube and a proximal side of said cylindrical member and is fixed at a proximal portion thereof to the proximal portion of said distal-side tube and the distal portion of said proximal-side tube, and a pulling member which extends inside said proximal-side tube, with one end portion thereof fixed to said cylindrical member and is pulled toward said proximal side of said proximal-side tube to move said cylindrical member toward a proximal side of said stent delivery device, wherein said distal-side tube has a proximal-side opening which is open at said proximal side of said distal-side tube and communicates with said guide wire lumen; and a stent-locking portion which is disposed at said distal side of said distal-side tube and contacts a proximal end of said stent accommodated inside said cylindrical member, thus preventing said stent from moving to said proximal side of said stent delivery device; said stent is formed approximately cylindrically, and is accommodated in said cylindrical member, with said stent being compressed in an axial direction thereof, and expands outward and returns to a configuration before said stent is compressed, when said stent is implanted in an organism; and an outer diameter of said proximal-side tube is set smaller than an outer diameter of a portion, having a maximum diameter, which is disposed in a region distal from said proximal-side tube; wherein said cylindrical member thereby defines a stent accommodation cylindrical member configured to slide on an inner side of said intermediate tube when said pulling member is pulled toward said proximal side of said proximal-side tube.