STENT DELIVERY SYSTEM

• US 20140257459A1
• Filed: 05/23/2014
• Published: 09/11/2014
• Est. Priority Date: 02/15/2012
• Status: Active Grant

• Current Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Original Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Inventors: MASAKAZU, Shimoyama
• Granted Patent: US 9,707,115 B2
• Time in Patent Office: Days
• US Class Current: 623/1.11
• CPC Class Codes: A61B 17/00 Surgical instruments, devices or methods, e.g. tourniquets A61B18/00 takes precedence; contraceptive devices, pessaries, or applicators therefor A61F6/00; eye surgery A61F9/007; ear surgery A61F11/00
• CPC Class Codes: A61F 2/06 Blood vessels
• 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

Abstract

In an operating unit constituting a stent delivery system, a protector for preventing an inner tube body from deforming is provided between a rack member and a containing groove guiding the rack member (so as to be movable. The protector, for example is a bellows shaped cylinder so as to be freely extendable and covers an outer circumferential side of the inner tube body. At the time of releasing a stent, the protector is compressed due to the movement of the rack member toward the proximal side and the inner tube body is prevented from deforming due to the protector, because an inner circumferential surface of the protector comes into contact with the inner tube body.

Claims

1. A stent delivery system comprising:

an inner tube;

a stent which is compressed toward a center axis and disposed on a distal side of the inner tube as the stent is inserted into a lumen of a living body, and which can be restored into a pre-compression shape by expanding outward as the stent is indwelled in the lumen of the living body;

an outer tube disposed on an outer surface side of the inner tube, and configured to release the stent to the exterior by moving proximally relative to the inner tube; and

an operating unit for moving the outer tube in an axial direction relative to the inner tube,

wherein the operating unit includes a housing, and a protector different from the housing, enclosing an outer circumferential side of the inner tube connected to the housing between the proximal end of the inner tube and the proximal end of the outer tube.

2. The stent delivery system according to claim 1, wherein the protector covers the outer circumferential side of the inner tube.

3. The stent delivery system according to claim 1, wherein the protector is configured to be freely deformable in the axial direction when the outer tube is moved along the axial direction.

4. The stent delivery system according to claim 1, wherein the protector is configured to apply an elastic force which is less than a thrust generated by the outer tube moving toward the proximal side.

5. The stent delivery system according to claim 1, wherein a distal end of the protector is moved toward a proximal end of the protector when the outer tube or a connection body to which the outer tube is connected is moved in an axial direction relative to the inner tube.

6. The stent delivery system according to claim 1, wherein the protector is a bellows-shaped cylinder that is freely foldable in the axial direction.

7. The stent delivery system according to claim 1, wherein the protector is spiral shaped along an axial direction of the protector.

8. The stent delivery system according to claim 1, wherein the protector is cylindrically shaped.

9. The stent delivery system according to claim 1, wherein the protector comprises of at least two slide members) positioned between the proximal end of the inner tube and the proximal end of the outer tube.

10. The stent delivery system according to claim 9, wherein the at least two slide members are movable relative to each other.

11. A stent delivery system comprising:

an inner tube possessing a proximal end and a distal end;

an outer tube possessing a proximal end and a distal end;

a stent positioned between an outer surface of the distal end of the inner tube and an inner surface of the distal end of the outer tube in a collapsed state of the stent, the stent being configured to expand radially outwardly from the collapsed state by moving the outer tube proximally relative to the inner tube;

an operating unit operably connected to the outer tube and configured to move the outer tube proximally in an axial direction relative to the inner tube, wherein the operating unit includes a housing possessing an inner surface;

a protector different from the housing positioned on the outer surface of the inner tube between the proximal end of the inner tube and the proximal end of the outer tube, the protector possessing an outer surface; and

the protector possessing an inner surface facing the outer surface of the inner tube, and the outer surface of the protector being spaced from the inner surface of the housing.

12. The stent delivery system according to claim 11, wherein a distal end of the protector moves toward the proximal end of the inner tube when the outer tube is moved proximally relative to the inner tube.

13. The stent delivery system according to claim 11, wherein the operating unit includes a connection body possessing a proximal-most end and a distal-most end, the outer tube being connected to the distal-most end of the connection body;

and

wherein a distal end of the protector is connected to the proximal-most end of the connection body.

14. The stent delivery system according to claim 13, wherein the distal end of the protector is axially moved towards the proximal end of the protector when the connection body is moved proximally in an axial direction.

15. The stent delivery system according to claim 13, wherein the distal end of the outer tube is axially moved towards the proximal end of the outer tube when the connection body is moved proximally in an axial direction such that the stent expands radially outwardly from the collapsed state.

16. A stent delivery system comprising:

an inner tube possessing a proximal end and a distal end;

an outer tube possessing a proximal end and a distal end;

a stent positioned between an outer surface of the distal end of the inner tube and an inner surface of the distal end of the outer tube in a collapsed state of the stent, the stent being configured to expand radially outwardly from the collapsed state by moving the outer tube proximally relative to the inner tube;

an operating unit including a housing, a connection body and a protector;

the connection body possessing a distal-most end and a proximal-most end, the outer tube being connected to the distal-most end of the connection body and protector being connected to the proximal-most end of the connection body;

the protector surrounding the outer surface of the inner tube between a proximal-most end of the inner tube and the proximal end of the outer tube; and

an axial dimension of the protector being reduced when the connection tube is moved axially towards the proximal-most end of the inner tube.

17. The stent delivery system according to claim 16, wherein the protector is positioned between the outer surface of the inner tube and the inner surface of the housing.

18. The stent delivery system according to claim 16, wherein the protector possesses an inner surface and an outer surface, the outer surface of the inner tube contacting the inner surface of the protector when the connection tube is moved axially towards the proximal-most end of the inner tube.

19. The stent delivery system according to claim 18, wherein the housing possesses an inner surface and an outer surface, the outer surface of the protector moving towards the inner surface of the housing when the connection tube is moved axially towards the proximal-most end of the inner tube.

20. The stent delivery system according to claim 16, wherein the protector comprises a first slide member and a second slide member, the first slide member being connected to the proximal-most end of the connector and being configured to move towards the second slide member when the connection tube is moved axially towards the proximal-most end of the inner tube.