Stent delivery system

摘要

This stent delivery system includes: a guide catheter inserted into the inside of a cylindrical stent, and inserted into the interior of the living body with the stent; a pusher catheter inserted into the interior of the living body with the guide catheter in a state where the guide catheter is inserted into the inside of the push catheter, and which is for pushing the stent along the guide catheter; a stent connecting member for connecting the stent with the pusher catheter; and a stent releasing member for releasing the stent from the pusher catheter by separating the connection between the stent and the pusher catheter depending on the stent connecting member, which is independently operable separately from the guide catheter, and which is inserted into the inside of the pusher catheter.

主权项

1. A stent delivery system for delivering a stent,
wherein the stent has a stent outer surface and a stent inner surface, wherein the stent inner surface defines a stent lumen, and wherein the stent has a proximal end face, the proximal end face of the stent defining a proximal opening of the stent lumen, wherein the stent delivery system comprises:
a pusher catheter having a pusher catheter outer surface and a pusher catheter inner surface, the pusher catheter inner surface defining a pusher catheter lumen, wherein the pusher catheter has a distal end face, the distal end face of the pusher catheter defining a distal opening of the pusher catheter lumen;an elongated stent securing material having a fixed first portion fixed to the pusher catheter, a releasable second portion, and a releasable third portion, in that order, along a length of the elongated stent securing material,
wherein in a secured configuration in which the stent and the pusher catheter are arranged in series along a longitudinal axis such that the proximal end face of the stent faces the distal end face of the pusher catheter, the releasable second portion is releasably connected to the stent and the releasable third portion is arranged in the pusher catheter lumen; andan elongated stent releasing material having a releasing portion configured to be retracted within the pusher catheter lumen along the longitudinal axis,wherein in the secured configuration of the stent and the pusher catheter, the releasing portion of the elongated stent releasing material is releasably connected to the releasable third portion of the elongated stent securing material to limit relative movement of the proximal end face of the stent and the distal end face of the pusher catheter along the longitudinal axis,wherein in the secured configuration of the stent and the pusher catheter, the releasable second portion, the fixed first portion, and the releasable third portion of the elongated stent securing material are disposed in that order along the longitudinal axis,
wherein the releasable second portion is releasably connected to the stent at a more distal side than the fixed first portion along the longitudinal axis, andwherein the releasable third portion is releasably connected to the releasing portion of the elongated stent releasing material at a more proximal side than the fixed first portion along the longitudinal axis, andwherein in a released configuration of the stent and the pusher catheter, the releasing portion of the elongated stent releasing material is retracted within the pusher catheter lumen to be disconnected from the releasable third portion of the elongated stent securing material such that the releasable second portion of the elongated stent securing material is disconnected from the stent to permit relative movement of the proximal end face of the stent and the distal end face of the pusher catheter along the longitudinal axis.