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STENT DELIVERY SYSTEM

  • US 20120022635A1
  • Filed: 08/12/2011
  • Published: 01/26/2012
  • Est. Priority Date: 02/16/2009
  • Status: Active Grant
First Claim
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1. A stent delivery system comprising:

  • a tube body having a guide wire lumen;

    a stent-containing tubular member enveloping a distal end portion of the tube body and being slidable relative to the tube body toward a proximal end of the tube body;

    a stent contained in the stent-containing tubular member;

    a wire having one end portion fixed to the stent-containing tubular member and operable to move the stent-containing tubular member in a proximal direction;

    the tube body including a stent lock section abutting a proximal end of the stent contained in the stent-containing tubular member to restrict movement of the stent in the proximal direction;

    the stent possessing a cylindrical shape and being contained in the stent-containing tubular member while in a compressed state in which the stent is compressed toward a center axis of the stent, and the stent being restored to a pre-compression shape through outward expansion when indwelled in a living body;

    an operating section located proximally of the stent-containing tubular member;

    the operating section including a wire winding mechanism for winding the wire to thereby move the stent-containing tubular member toward the proximal direction and a wire winding amount restriction mechanism for restricting a length of the wire pulled by the wire winding mechanism;

    the wire winding mechanism including an operating section housing and an operating rotary roller having a portion exposed from the operating section housing which is operable by a user to rotate the operating rotary roller and wind the wire;

    the wire winding mechanism including a winding shaft section coaxial and integral with the operating rotary roller, the one end portion of the wire being held on the winding shaft section;

    the winding shaft section having a smaller outer diameter than the operating rotary roller;

    the wire winding amount restriction mechanism including a driving gear coaxial and integral with the operating rotary roller and a driven gear rotated intermittently by the driving gear; and

    the driven gear and the driving gear being configured as a stopper to stop rotation of the driving gear after rotation of the driving gear by a predetermined amount.

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