Bifurcated stent and method of making same

• US 6,090,133 A
• Filed: 03/27/1998
• Issued: 07/18/2000
• Est. Priority Date: 05/03/1996
• Status: Expired due to Term

• Current Assignee: Medinol Limited (Medinol USA Incorporated)
• Original Assignee: Medinol Limited (Medinol USA Incorporated)
• Inventors: Richter, Jacob, Pinchasik, Gregory
• Primary Examiner(s): Jackson, Gary
• Assistant Examiner(s): TRUONG, KEVIN THAO
• Application Number:
  US09/049,842
• Time in Patent Office: 844 Days
• Field of Search: 606/194, 606/191, 606/198, 623/1, 623/12, 128/898
• US Class Current: 623/1.35
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2/856 Single tubular stent with a side portal passage
• 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 2002/065 Y-shaped blood vessels
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2220/0041 using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2230/001 Figure-8-shaped, e.g. hourglass-shaped
• CPC Class Codes: A61F 2240/001 Designing or manufacturing processes
• CPC Class Codes: Y10S 623/901 Method of manufacturing prosthetic device
• CPC Class Codes: Y10T 29/494 Fluidic or fluid actuated device making

Abstract

A bifurcated stent for insertion into a bifurcated vessel such as a blood vessel. In one embodiment, a first sheet is formed into a first leg, a second sheet is formed into a second leg, a third sheet is formed into a stem, and the two legs are attached to the stem. In a second embodiment, a first sheet is formed into a member having a first leg and half of a stem, a second sheet is formed into a second member having a second leg and half of a stem, and the two stem halves are combined to form the bifurcated stent. In a third embodiment, the stent comprises two sections that are serially inserted and assembled within the vessel at the site of the bifurcation to be treated.

Claims

1. A method of making a bifurcated stent, comprising the steps of:

a) preparing a first sheet having a proximal end and a distal end;

b) providing said first sheet with an expandable pattern;

c) deforming said distal end of said first sheet to form a first leg and deforming said proximal end of said first sheet to form a first stem half;

d) preparing a second sheet having a proximal end and a distal end;

e) providing said second sheet with an expandable pattern;

f) deforming said distal end of said second sheet to form a second leg and deforming said proximal end of said second sheet to form a second stem half; and

g) joining said first stem half to said second stem half to form a stem.

2. The method of claim 1, wherein said first sheet and said second sheet are substantially the same size.

3. The method of claim 1, wherein said first sheet and said second sheet are of a different size.

4. The method of claim 1, wherein said joining step is carried out utilizing screwing.

5. The method of claim 1, wherein said joining step is carried out utilizing crimping.

6. The method of claim 1, wherein said joining step is carried out utilizing soldering.

7. The method of claim 1, wherein said joining step is carried out utilizing welding.

8. The method of claim 7 wherein said welding step is carried out utilizing spot welding.

9. A bifurcated stent comprising:

a) a first sheet having a proximal end and a distal end;

said distal end of said first sheet deformed to form a first leg and said proximal end of said first sheet deformed to form a first stem half;

b) a second sheet having a proximal end and a distal end;

said distal end of said second sheet deformed to form a second leg and said proximal end of said second sheet deformed to form a second stem half; and

c) means for joining said first stem half to said second stem half to form a stem.

10. The stent of claim 9, wherein said first sheet and said second sheet are substantially the same size.

11. The stent of claim 9, wherein said first sheet and said second sheet are of a different size.

12. The stent of claim 9, wherein said means for joining is a screw.

13. The stent of claim 9, wherein said means for joining is a crimp.

14. The stent of claim 9, wherein said means for joining is solder.

15. The stent of claim 9, wherein said means for joining is a weld.

16. The stent of claim 15 wherein said weld is a spot weld.

17. The stent of claim 9, wherein said first and said second sheets are etched with an expandable pattern.

18. A method of making a bifurcated stent, comprising the steps of:

a) preparing a first sheet having a proximal end and a distal end and having a first side, a second side, a third side, a fourth side, a fifth side, a sixth side, a seventh side, and an eighth side;

b) deforming said distal end of said first sheet and joining said fourth side to said sixth side to form a first leg and deforming said proximal end of said first sheet to form a first stem half;

c) preparing a second sheet having a proximal end and a distal end and having a first side, a second side, a third side, a fourth side, a fifth side, a sixth side, a seventh side, and an eighth side;

d) deforming said distal end of said second sheet and joining said fourth side to said sixth side to form a second leg and deforming said proximal end of said second sheet to form a second stem half; and

e) joining said eighth of said first stem half to said second side of said second stem half and joining said second side of said first stem half to said eighth side of said second stem half to form a stem.

19. The method of claim 18, wherein said first sheet and said second sheet are substantially the same size.

20. The method of claim 18, wherein said first sheet and said second sheet are of a different size.

21. The method of claim 18, wherein said joining steps are carried out utilizing screwing.

22. The method of claim 18, wherein said joining steps are carried out utilizing crimping.

23. The method of claim 18, wherein said joining steps are carried out utilizing soldering.

24. The method of claim 18, wherein said joining steps are carried out utilizing welding.

25. The method of claim 24 wherein said welding steps are carried out utilizing spot welding.

26. The method of claim 18, further comprising the step of providing said sheets with an etched pattern.

27. A bifurcated stent comprising:

a) a first sheet having a proximal end and a distal end and having a first side, a second side, a third side, a fourth side, a fifth side, a sixth side, a seventh side and an eighth side;

said fourth side and said sixth side of said first sheet deformed and joined to form a first leg and said proximal end of said first sheet deformed to form a first stem half;

b) a second sheet having a proximal end and a distal end and having a first side, a second side, a third side, a fourth side, a fifth side, a sixth side, a seventh side and an eighth side;

said fourth side and said sixth side of said second sheet deformed and joined to form a second leg and said proximal end of said second sheet deformed to form a second stem half; and

c) means for joining said eighth side of said first stem half to said second side of second stem half and joining said second side of said first stem half to said eighth side of said second stem half to form a stem.

28. The stent of claim 27, wherein said first sheet and said second sheet are substantially the same size.

29. The stent of claim 27, wherein said first sheet and said second sheet are of a different size.

30. The stent of claim 27, wherein said means for joining is a screw.

31. The stent of claim 27, wherein said means for joining is a crimp.

32. The stent of claim 27, wherein said means for joining is solder.

33. The stent of claim 27, wherein said means for joining is a weld.

34. The stent of claim 33 wherein said weld is a spot weld.

35. The stent of claim 27, wherein said first and said second sheets are provided with an expandable pattern.