STENT WITH SELF-DEPLOYABLE PORTION HAVING WINGS OF DIFFERENT LENGTHS

• US 20090182409A1
• Filed: 02/20/2009
• Published: 07/16/2009
• Est. Priority Date: 01/10/2005
• Status: Active Grant

• Current Assignee: Trireme Medical Incorporated
• Original Assignee: Trireme Medical Incorporated
• Inventors: Konstantino, Eitan, Feld, Tanhum
• Granted Patent: US 9,101,500 B2
• Time in Patent Office: Days
• US Class Current: 623/1.110
• CPC Class Codes: A61F 2/856 Single tubular stent with a side portal passage
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/954 for placing stents or stent-grafts in a bifurcation
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/821 Ostial stents
• CPC Class Codes: A61F 2002/91508 the meander having a difference in amplitude along the band
• CPC Class Codes: A61F 2002/91516 the meander having a change in frequency along the band
• CPC Class Codes: A61F 2002/91525 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/9155 Adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/91566 connected trough to trough

Abstract

The present invention provides methods and devices for placement of a stent in a bifurcation or ostial lesion. The stent comprises a main body and a flaring portion. The main body is designed to expand and support a main vessel of the bifurcation and defines a main body axis. The flaring portion is disposed on a side of the main body and is adapted to flare radially and offset the main body axis in response to expansion of the main body. The flaring portion comprises at least one distal wing and at least one proximal wing. Each wing is aligned along the main body axis. The at least one proximal wing is longer than the at least one distal wing, providing greater coverage of the proximal side of the side vessel than on the distal surface of the side vessel.

Claims

1. An expandable stent for deployment at a vascular bifurcation having a side vessel branching from a main vessel, the stent comprising:

a main body for expansion into the main vessel, wherein the main body defines a main body axis; and

a flaring portion disposed on a side of the main body and adapted to flare radially and offset the main body axis;

wherein the flaring portion comprises at least one distal wing and at least one proximal wing each aligned along the axis of the main body, and wherein the at least one proximal wing is longer than the at least one distal wing.

2. The expandable stent of claim 1, wherein the side vessel branches from the main vessel at an acute angle in a distal direction.

3. The expandable stent of claim 1, wherein the at least one distal wing and the at least one proximal wing are configured to open at different angles relative to the axis of the main body when the flaring portion flares radially into the side branch vessel.

5. The expandable stent of claim 1, wherein the flaring portion is adapted to flare radially and offset the main body axis in response to expansion of the main body into the main vessel.

6. The expandable stent of claim 5, further comprising at least one connector disposed between the main body and the wings, wherein the at least one connector deforms in response to expansion of the main body to cause the wings to flare radially.

7. The expandable stent of claim 6, wherein the at least one distal wing and the at least one proximal wing each comprise a base and sides, and wherein the at least one connector is disposed between the main body and the base of each wing.

8. The expandable stent of claim 7, wherein the at least one connector transfers displacement and expansion forces from the main body to the flaring portion during expansion of the main body.

9. The expandable stent of claim 1, wherein the at least one distal wing consists only of one distal wing.

10. The expandable stent of claim 1, wherein the at least one proximal wing consists only of one proximal wing.

11. The expandable stent of claim 1, wherein the at least one distal wing and the at least one proximal wing each comprise a base, sides, and a radiopaque marker disposed above the base and between the sides.

12. The expandable stent of claim 1, wherein the at least one distal wing and the at least one proximal wing each comprise a base, sides, and struts extending from the sides of each wing to the main body to provide coverage of a side branch ostium when the wing is opened into said ostium.

13. The expandable stent of claim 1, wherein the expandable stent is balloon expandable.

14. The expandable stent of claim 1, wherein the flaring portion flares at an angle in the range from 10 to 150 degrees relative to the main body axis when the main body is expanded.

15. The expandable stent of claim 1, further comprising a therapeutic agent disposed over at least a portion of the expandable stent.

16. The expandable stent of claim 15, further comprising a polymeric layer, wherein the therapeutic agent is sequestered in the polymeric layer.

17. A stent delivery system comprising:

an expandable stent as in claim 1; and

a delivery catheter comprising;

(a) a shaft having a proximal end and a distal end; and

(b) an inflatable balloon disposed near the distal end of the shaft;

wherein the stent is disposed on the balloon with the distal end of the stent faced distally and a proximal end of the stent facing proximally.

4. The expandable stent of claim 4, wherein the at least one proximal wing is configured to open to a greater angle relative to the main body than the at least one distal wing.

18. A method for deploying a stent at a vascular bifurcation having a side vessel branching from a main vessel, said method comprising:

positioning a main body of the stent in the main vessel at the bifurcation;

opening a distal wing and a proximal wing from the main body into the side vessel, wherein the distal wing is shorter than the proximal wing so that there is greater coverage on a proximal surface of the side vessel by the proximal wing than on the distal surface of the side vessel by the distal wing.

19. The method of claim 18, wherein the side branch branches from the main vessel at an acute angle in a distal direction.

20. The method of claim 18, wherein the vascular bifurcation defines a proximal intersection angle between the main vessel and the side vessel, and wherein opening the proximal wing comprises opening the proximal wing to an angle corresponding to the proximal intersection angle.

21. The method of claim 18, wherein the vascular bifurcation defines a transition zone between the main vessel and the side vessel, the transition zone having a distal radius of curvature, and wherein opening the distal wing comprises opening the distal wing to an angle corresponding to the distal radius of curvature.

22. The method of claim 18, further comprising:

positioning a side branch stent at the side vessel, wherein the side branch stent has a proximal end and a distal end and wherein the proximal end of the side branch stent is positioned adjacent the bifurcation;

expanding the side branch stent, wherein the greater coverage on the proximal side of the side vessel by the proximal wing than on the distal side of the side vessel of by the distal wing minimizes the gap between the proximal end of the side branch stent and the proximal and distal wings of the main body.