Bifurcation stent with uniform side branch projection

• US 20070208419A1
• Filed: 03/06/2006
• Published: 09/06/2007
• Est. Priority Date: 03/06/2006
• Status: Abandoned Application

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: Gregorich, Daniel, Meyer, Michael
• Application Number:
  US11/368,964
• Publication Number:
  US 20070208419A1
• Time in Patent Office: Days
• US Class Current: 623/1.350
• CPC Class Codes: A61F 2/856 Single tubular stent with a side portal passage
• 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 2002/91508 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 2002/91575 connected peak to trough

Abstract

An expandable stent may be made having a tubular body and an expandable side branch section. The tubular body has at least one perimeter which defines at least one opening in the wall of the tubular body. The expandable side branch section has a plurality of elongate members with a first end engaged to the perimeter. Each of the plurality of elongate members has a second end that extends to a pre-determined distance away from the tubular body when in an expanded state. The expandable side branch section is configured to expand outward to allow for the formation of a bifurcated stent with a side branch.

Claims

1. A stent comprising:

a substantially cylindrical tubular body, the tubular body defining a primary lumen, the tubular body comprising a wall and at least one perimeter member defining at least one opening in the wall, the at least one opening having a circumferential length and a longitudinal length, the tubular body having at least one expandable side branch, the at least one side branch comprising a plurality of elongate members, the plurality of elongate members having a first end and a second end, the first end engaged to the at least one perimeter member, the plurality of elongate members having an unexpanded state and an expanded state, in the unexpanded state the plurality of elongate members positioned substantially within the wall of the tubular body, in the expanded state the plurality of elongate members defining a side branch lumen and the second end of the plurality of elongate members extending to a pre-determined distance away from the tubular body, the pre-determined distance the same for all of the plurality of elongate members, the side branch lumen being in fluid communication with the primary lumen.

2. The stent of claim 1, the tubular body having two perimeter members, a first perimeter member defining a first opening, a second perimeter member defining a second opening, the first opening having a center point located at a first longitudinal coordinate and a first circumferential coordinate, and the second opening having a center point located at a second longitudinal coordinate and a second circumferential coordinate.

3. The stent of claim 2, the first longitudinal coordinate different from the second longitudinal coordinate.

4. The stent of claim 1, the circumferential length of the opening greater than the longitudinal length of the opening.

5. The stent of claim 1, wherein the shape of the plurality of elongate members is triangular, columnar or zig-zag.

6. The stent of claim 1, wherein at least one of the plurality of elongate members define at least one hole.

7. The stent of claim 6, having a therapeutic agent within the at least one hole.

8. The stent of claim 7, wherein the therapeutic agent is selected from at least one member of the group consisting of a non-genetic therapeutic agent, a genetic therapeutic agent, cellular material, a polymer agent, and any combination thereof.

9. The stent of claim 1, having four elongate members.

10. The stent of claim 1 wherein the side branch is self-expanding.

11. The stent of claim 1 wherein the side branch is balloon expandable.

12. The stent of claim 1, having twelve elongate members.

13. The stent of claim 1 further comprising at least one radiopaque marker.

14. A bifurcated stent formed by:

providing a stent, the stent comprising an expandable tubular body, the tubular body having a wall, a longitudinal flowpath and at least one perimeter member defining at least one opening in the wall, the tubular body having at least one expandable side branch, the at least one side branch comprising a plurality of elongate members, the plurality of elongate members having a first end and a second end, the first end engaged to the at least one perimeter member, and the second end of the plurality of elongate members extending to a pre-determined distance away from the tubular body, the pre-determined distance the same for all of the plurality of elongate members;

expanding the tubular body of the stent to a first diameter; and

expanding the expandable side branch outward to define a second flowpath which branches off the longitudinal flowpath.

15. The stent of claim 14 wherein at least one of the expanding steps is accomplished with a balloon.

16. The stent of claim 15 wherein at least one of the expanding steps is accomplished by withdrawing a sheath which is disposed over at least a portion of the stent.

17. In combination, a catheter and an expandable stent, the stent having a tubular surface disposed about a longitudinal flowpath, the tubular surface including a plurality of elongate members arranged along the surface about a lateral opening defined by a perimeter member, the plurality of elongate members comprising a one first end and a second end, the first end engaged to the perimeter member, and the second end of the plurality of elongate members extending to a pre-determined distance away from the tubular body, the pre-determined distance the same for all of the plurality of elongate members, the expandable stent disposed about the catheter, the catheter including an elongated catheter member which extends through the opening.

18. An stent comprising an expandable tubular body, the tubular body having a wall and at least one perimeter member defining at least one opening in the wall, the opening having a circumferential length and a longitudinal length, the circumferential length of the opening greater than the longitudinal length of the opening, the stent further comprising an expandable side branch, the expandable side branch comprising a plurality of elongate members, the plurality of elongate members having a first end, a second end and an expanded state, the first end engaged to the at least one perimeter member, the second end extending to a pre-determined distance away from the tubular body in the expanded state, the pre-determined distance the same for all of the plurality of elongate members.