Bifurcated stent

• US 7,169,177 B2
• Filed: 01/15/2003
• Issued: 01/30/2007
• Est. Priority Date: 01/15/2003
• Status: Expired due to Fees

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Obara, Robert Z.
• Primary Examiner(s): BARRETT, THOMAS C
• Application Number:
  US10/342,756
• Publication Number:
  US 20040138736A1
• Time in Patent Office: 1,476 Days
• Field of Search: 623/1.35
• US Class Current: 623/1.35
• CPC Class Codes: A61B 17/12022 Occluding by internal devices, e.g. balloons or releasable wires plugging an opening in the wall of an organ A61B17/0057; occluders for the cervical canal A61F6/146; vas deferens occluders A61F6/20
• CPC Class Codes: A61B 17/12118 for positioning in conjunction with a stent
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/067 modular
• CPC Class Codes: A61F 2002/823 Stents, different from stent-grafts, adapted to cover an aneurysm
• CPC Class Codes: A61F 2002/828 Means for connecting a plurality of stents allowing flexibility of the whole structure
• 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 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2250/0015 differing in density or specific weight

Abstract

A bifurcated stent comprises a body portion, a first branch portion, a second branch portion, a first pivot portion and a second pivot portion constructed from a common continuous sheet of stent material. The body portion, first branch portion and second branch portion provided with a substantially tubular shape, the tubular shape of each defines a lumen respectively therethrough. The lumen defined by the body portion is in fluid communication with the lumen defined by the first branch portion and the second branch portion. The first branch portion is pivotally engaged to an end of the body portion by the first pivot portion. The second branch portion is pivotally engaged to an end of the body portion by the second pivot portion.

Claims

1. A bifurcated stent comprising:

a body portion, a first branch portion, a second branch portion, a first pivot portion and a second pivot portion;

the body portion, the first branch portion, the second branch portion, the first pivot portion and the second pivot portion constructed from a common continuous sheet of stent material, each of the body portion, first branch portion and second branch portion having a first side and a second side opposite the first side and fixedly engaged to the first side to provide each of the body portion, first branch portion and second branch portion with a substantially tubular shape and defining a lumen respectively therethrough, the lumen defined by the body portion being in fluid communication with the lumen defined by the first branch portion and the second branch portion, the first branch portion being pivotally engaged to an end of the body portion by the first pivot portion, the second branch portion being pivotally engaged to an end of the body portion by the second pivot portion;

at least one of the first branch portion and the second branch portion comprising at least one aneurysm flap, the at least one aneurysm flap constructed and arranged to be positioned immediately adjacent to a carina of a vessel bifurcation.

2. The bifurcated stent of claim 1 wherein at least a portion of at least one of the body portion, the first branch portion and the second branch portion constructed and arranged to be balloon expandable, self-expandable or hybrid expandable.

3. The bifurcated stent of claim 1 wherein the first branch portion defines an angle with the body portion, the angle being about 0 degrees to about 180 degrees.

4. The bifurcated stent of claim 1 wherein the first branch portion defines an angle with the body portion, the angle being about 0 degrees to about 90 degrees.

5. The bifurcated stent of claim 1 wherein the second branch portion defines an angle with the body portion, the angle being about 0 degrees to about 180 degrees.

6. The bifurcated stent of claim 1 wherein the first branch portion and the second branch portion are constructed and arranged to at least partially engage the carina of the vessel bifurcation.

7. The bifurcated stent of claim 1 wherein the sheet of stent material is at least partially constructed form at least one material of the group consisting of:

nickel, titanium, nickel-titanium alloys, stainless steel, stainless steel alloys, tantalum and any combinations thereof.

8. The bifurcated stent of claim 1 wherein the sheet of stent material defines a pattern of interconnected strut members, wherein adjacent interconnected strut members define openings therethrough.

9. The bifurcated stent of claim 8 wherein the pattern of interconnected struts defines at least one first area of interconnected strut members and at least one second area of interconnected strut members the at least one first area having a greater density of stent material than the at least one second area.

10. The bifurcated stent of claim 9 wherein the first branch portion and the second branch portion are each at least partially defined by the at least one first area and the at least one second area.

11. The bifurcated stent of claim 10 wherein the first branch portion and the second branch portion are constructed and arranged to at least partially engage a vessel bifurcation, when the first branch portion and the second branch portion are at least partially engaged to the vessel bifurcation the at least one first area of the first branch portion and the second branch portion is positioned immediately adjacent to the carina of the vessel bifurcation.

12. The bifurcated stent of claim 1 wherein the sheet of stent material defines a body section, a first branch section and a second branch section, the body section constructed and arranged to be formed into the body portion, the first branch section constructed and arranged to be formed into the first branch portion and the second branch section constructed and arranged to be formed into the second branch portion.

13. The bifurcated stent of claim 12 wherein the body section of the sheet defines a first body section end and a second body section end, the body portion being provided with the substantially tubular shape by engaging the first body section end and the second body section end one to the other.

14. The bifurcated stent of claim 13 wherein the first body section end and the second body section end are at least partially overlappingly engaged one to the other.

15. The bifurcated stent of claim 12 wherein the first branch section of the sheet defines a first branch section end and a second first branch section end, the first branch portion being provided with the substantially tubular shape by engaging the first branch section end and the second branch section end one to the other.

16. The bifurcated stent of claim 15 wherein the first branch section end and the second branch section end are at least partially overlappingly engaged one to the other.

17. The bifurcated stent of claim 12 wherein the second branch section of the sheet defines a first branch section end and a second branch section eud, the second branch portion being provided with the substantially tubular shape by engaging the first branch section end and the second branch section end one to the other.

18. The bifurcated stent of claim 17 wherein the first branch section end and the second branch section end are at least partially overlappingly engaged one to the other.

19. The bifurcated stent of claim 8 wherein each of the first pivot connection and the second pivot connection comprise at least one strut member.

20. The bifurcated stent of claim 1 wherein the first pivot connection is defined by a section of the sheet of stent material extending between the body portion and the first branch portion when the body portion and the first branch portion are respectively provided with the substantially tubular form, the first pivot connection having a circumferential length less than that of the body portion and the first branch portion.

21. The bifurcated stent of claim 1 wherein the second pivot connection is defined by a section of the sheet of stent material extending between the body portion and the second branch portion when the body portion and the second branch portion are respectively provided with the substantially tabular form, the second pivot connection having a circumferential length less than that of the body portion and the second branch portion.

22. The bifurcated stent of claim 1 wherein the at least one aneurysm flap is constructed of a shape memory material.

23. The bifurcated stent of claim 22 wherein the at least one aneurysm flap comprises a first aneurysm flap and a second aneurysm flap, the first aneurysm flap being pivotally engaged to only the first branch portion, the second aneurysm flap being pivotally engaged to only the second branch portion.

24. The bifurcated stent of claim 23 wherein the first aneurysm flap and the second aneurysm flap are each moveable from a open position and a closed position, in the closed position the first aneurysm flap and the second aneurysm flap being overlappingly engaged to one another over the carina of the vessel bifurcation.

25. A method of manufacturing a bifurcated stent comprising the steps of:

providing a single sheet of stent material with a body section, the body section having a primary body end and a secondary body end;

a first branch section, the first branch section having a primary first branch end and a secondary first branch end;

a second branch section, the second branch section having a primary second branch end and a secondary second branch end;

a first connector section; and

a second connector section wherein the first connector section extends between a first end of the body section to an adjacent end of the first branch section, and the second connector section extends between the first end of the body section to an adjacent end of the second branch section;

at least one of the adjacent end of the first branch section and the adjacent end of the second branch section comprising at least one aneurysm flap, the at least one aneurysm flap constructed and arranged to be positioned immediately adjacent to a carina of a vessel bifurcation;

providing the single sheet of stent material with a predetermined pattern of interconnected struts and openings defined therebetween, each of the first connector section and the second connector section comprising at least one interconnected strut;

engaging the primary body end and the secondary body end one to the other to provide a body portion of the stent;

engaging the primary first branch end and the secondary first branch end one to the other to provide a first branch portion of the stent; and

engaging the primary second branch end and the secondary second branch end one to the other to provide a second branch portion of the stent.