STENT DELIVERY SYSTEM

• US 20140025155A1
• Filed: 09/24/2013
• Published: 01/23/2014
• Est. Priority Date: 03/25/2011
• Status: Active Grant

• Current Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Original Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Inventors: MASUBUCHI, Yuki
• Granted Patent: US 9,662,236 B2
• Time in Patent Office: Days
• US Class Current: 623/1.12
• CPC Class Codes: A61F 2/962 having an outer sleeve

Abstract

A stent delivery system wherein, in a gap between an inner tube body and an outer tube body, a sealing member is arranged on the proximal side relative to a distal opening of a lumen, which extends from the proximal end of the inner tube body, and a guide wire leading-out hole. The inner circumferential surface of the sealing member is fixed to the outer circumferential surface of a first proximal tube of the inner tube body, and the outer circumferential surface of the sealing member is in sliding contact with the inner circumferential surface of a second proximal tube of the outer tube body. When blood or the like enters into the stent delivery system via the distal ends of the inner tube body and the outer tube body, progress of the blood or the like toward an operating unit side is inhibited by the sealing member.

Claims

1. A stent delivery system comprising:

an inner tube opening at a proximal end thereof;

a stent which is disposed on an outer surface of a distal portion of the inner tube while being compressed toward a center axis thereof at the time of insertion into a living body lumen and which can be restored into its pre-compression shape by expanding outward when put indwelling in the living body lumen; and

an outer tube which, by being disposed on an outer surface side of the inner tube, can contain the stent in its lumen and which, by moving proximally relative to the inner tube, can release the stent contained in its inside,

wherein a sealing member is provided between the outer tube and the inner tube on a proximal side relative to the stent, and the inner tube is provided, between the sealing member and the stent, with a first opening through which a lumen of the inner tube and the exterior of the inner tube communicate with each other.

2. The stent delivery system according to the claim 1,

wherein the outer tube is provided, between the first opening and the stent, with a hole through which a lumen of the outer tube and the exterior of the outer tube communicate with each other.

3. The stent delivery system according to claim 1,

wherein the sealing member is fixed to either one of the outer tube or the inner tube.

4. The stent delivery system according to claim 1,

wherein the sealing member is provided to be slidable in relation to either one of the outer tube or the inner tube.

5. The stent delivery system according to claim 1,

wherein a sectional area of the first opening is set to be large in relation to the sectional area of a gap between the outer tube and the inner tube.

6. The stent delivery system according to claim 1,

wherein the inner tube is provided, between the sealing member and the first opening, with a second opening through which the lumen of the inner tube and the exterior of the inner tube communicate with each other.

7. The stent delivery system according to claim 6,

wherein the second opening is provided so as to be adjacent to the sealing member.

8. The stent delivery system according to claim 6,

wherein the second opening is composed of a spiral slit or a plurality of mutually spaced-apart communicating holes.

9. The stent delivery system according to claim 6,

wherein the area of the second opening is larger than the sectional area of a gap between the outer tube and the inner tube.

10. The stent delivery system according to claim 1,

wherein the sealing member

is formed of a metallic material, a resin material, or a high-viscosity liquid.

11. A stent delivery system comprising:

an inner tube;

an outer tube provided on an outer circumference side of the inner tube, a gap defined between the inner tube and the outer tube being configured to contain an expandable stent;

an operating unit connected to the inner tube for moving the outer tube relative to the inner tube to deploy the expandable stent; and

a sealing member arranged in the gap between the inner tube and the outer tube;

wherein, when blood or other fluid enters into the stent delivery system via an open distal end of the inner tube or of the outer tube, said sealing member prevents the blood or other fluid from spreading to the operating unit.

12. The stent delivery system according to claim 11,

wherein the inner tube includes a first distal tube and a first proximal tube;

wherein the outer tube includes a second distal tube and a second proximal tube; and

wherein an inner circumferential surface of said sealing member is fixed to the outer circumferential surface of the first proximal tube of the inner tube, and an outer circumferential surface of the sealing member is in sliding contact with an inner circumferential surface of the second proximal tube of the outer tube.

13. The stent delivery system according to claim 12,

wherein the inner circumferential surface of said sealing member is fixed to the outer circumferential surface of the first proximal tube by an adhesive.

14. The stent delivery system according to claim 11,

wherein said sealing member is formed of a metallic material and an outer diameter of said sealing member is slightly smaller than an inner diameter of the outer tube.

15. The stent delivery system according to claim 11,

wherein said sealing member is formed of an elastic material and an outer diameter of said sealing member is approximately equal to an inner diameter of the outer tube.

16. The stent delivery system according to claim 11,

wherein said sealing member is formed of an elastic material and an outer diameter of said sealing member is a litter greater than an inner diameter of the outer tube.

17. The stent delivery system according to claim 11,

wherein said sealing member is formed from a water-swellable resin material and an outer diameter of said sealing member before swelling with water is smaller than an inner diameter of the outer tube.

18. The stent delivery system according to claim 11,

wherein said sealing member is formed from a high-viscosity liquid.