Stent delivery device

• US 8,419,784 B2
• Filed: 09/10/2010
• Issued: 04/16/2013
• Est. Priority Date: 03/28/2005
• Status: Active Grant

• Current Assignee: Terumo Kabushiki Kaisha
• Original Assignee: Terumo Kabushiki Kaisha
• Inventors: Moriuchi, Yousuke, Morishita, Keitaro, Matsuoka, Emi
• Primary Examiner(s): Bui, Vy Q
• Application Number:
  US12/879,828
• Publication Number:
  US 20100331953A1
• Time in Patent Office: 949 Days
• Field of Search: 606/108, 606/191, 606/194, 606/195, 606/198, 606/192, 623/1.11, 623/1.23
• US Class Current: 623/1.11
• CPC Class Codes: A61F 2/9517 handle assemblies therefor
• CPC Class Codes: A61F 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61M 25/0147 with movable mechanical means, e.g. pull wires

Abstract

A stent delivery device includes a distal-side tube having a guide wire lumen; a proximal-side tube whose distal portion is fixed to a proximal portion of the distal-side tube; a cylindrical member which encloses a distal side of the distal-side tube and is slidable toward a proximal end of the distal-side tube; a stent accommodated in the cylindrical member; and a pulling member 6 for moving the cylindrical member toward a proximal side of the stent delivery device. The distal-side tube has a proximal-side opening which is open at the proximal side of the distal-side tube; and a stent-locking portion for preventing the stent from moving to the proximal side of the stent delivery device. The outer diameter of the proximal-side tube is set smaller than that of a portion, having a maximum diameter, which is disposed in a region of the stent delivery device which is distal from the proximal-side tube.

Claims

1. 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.

2. A stent delivery device according to claim 1, wherein said distal-side tube has a projected portion, for preventing a movement of said stent, which is provided at a side distal from said distal end of said stent;

and a distal side of said projected portion for preventing said movement of said stent is gradually decreased in a diameter thereof toward a distal end thereof.

3. A stent delivery device according to claim 1, further comprising a member, for maintaining a position of said pulling member, which is disposed on an outer surface of said distal-side tube and has a passage through which said pulling member is capable of penetrating.

4. A stent delivery device according to claim 1, further comprising a projected portion provided on an outer surface of said distal-side tube;

and said cylindrical member has a slit which extends from a proximal end thereof toward a distal side thereof and into which said projected portion is capable of moving.

5. A stent delivery device according to claim 1, wherein a central longitudinal axis of said proximal-side tube is shifted in a direction away from said proximal-side opening with respect to a central longitudinal axis of said distal-side tube such that the central longitudinal axis of said proximal-side tube is offset relative to the central longitudinal axis of said distal-side tube.

6. A stent delivery device according to claim 1, wherein said pulling member extends from a proximal end of said proximal-side tube and has a member for pulling operation fixed to an extended portion of said pulling member.

7. A stent delivery device according to claim 1, wherein said proximal-side tube has a sealing member through which said pulling member penetrates in a liquid-tight state.

8. A stent delivery device according to claim 1, wherein a hub having a valve holding said pulling member slidably and liquid-tightly is provided at a proximal portion of said proximal-side tube.

9. A stent delivery device according to claim 1, further comprising a movement distance restriction portion for restricting a movement distance of said cylindrical member toward a proximal side of said stent delivery device.

10. A stent delivery device according to claim 1, wherein said intermediate tube encloses said proximal side of said distal-side tube and said proximal side of said cylindrical member without preventing said cylindrical member from moving toward said proximal side of said stent delivery device;

one end portion of said pulling member is fixed to said cylindrical member inside said intermediate tube; and

said pulling member passes a space between said intermediate tube and said distal-side tube and extends into said proximal-side tube.

11. A stent delivery device according to claim 1, wherein two pulling members are provided.

12. A stent delivery device according to claim 1, wherein said pulling member passes through a space between said intermediate tube and said distal-side tube such that said pulling member is not exposed.