Stent with spiral side-branch

• US 20070112419A1
• Filed: 11/27/2006
• Published: 05/17/2007
• Est. Priority Date: 11/14/2005
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Yadin, Amnon
• Granted Patent: US 7,842,081 B2
• 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 2002/91525 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 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0091 helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section

Abstract

In at least one embodiment, a stent comprises a plurality of interconnected framework members defining a plurality of cells. A portion of the interconnected framework members comprise a side branch structure having an inner side branch cell that is shaped differently from other cells of the stent. The side branch structure further comprises a serpentine ring extending around the inner side branch cell, the serpentine ring having alternating struts and turns. Each strut includes curvature along its length and is oriented with the curvature being concave with respect to a center point of the inner side branch cell.

Claims

1. A stent comprising:

a plurality of interconnected framework members defining a plurality of cells, a portion of the interconnected framework members comprising a side branch structure defining an inner side branch cell, the inner side branch cell being shaped differently from other cells of the stent;

the side branch structure comprising a first serpentine ring extending around the inner side branch cell, the first serpentine ring comprising alternating struts and turns, each strut having curvature along its length, the curvature of each strut being concave with respect to a center point of the inner side branch cell.

2. The stent of claim 1, the struts comprising alternating first struts and second struts, the first struts being longer than the second struts.

3. The stent of claim 1, the side branch structure further comprising a second serpentine ring extending around the first serpentine ring.

4. The stent of claim 3, the turns of the first serpentine ring comprising alternating first inner turns and first outer turns;

the side branch structure further comprising a plurality of connectors, each connector spanning between a first inner turn of the first serpentine ring and a portion of the second serpentine ring.

5. The stent of claim 1, the interconnected framework members defining a plurality of serpentine bands, each serpentine band defining a wavelength;

the stent comprising end regions and a central region, the side branch structure located in the central region;

wherein serpentine bands in the central region have a shorter wavelength than serpentine bands in the end regions.

6. The stent of claim 1, wherein the turns of the first serpentine ring comprise a higher degree of curvature than the struts of the first serpentine ring.

7. The stent of claim 3, the turns of the first serpentine ring comprising alternating first inner turns and first outer turns;

the second serpentine ring comprising alternating second inner turns and second outer turns;

wherein the first outer turns are connected to the second inner turns.

8. The stent of claim 3, the second serpentine ring comprising alternating struts and turns, each strut having curvature along its length, the curvature of each strut being concave with respect to a center point of the inner side branch cell.

12. The stent of claim 11, wherein the first connector strut and each second connector strut are each connected at one end to the connector turn and connected at the other end to an expandable framework member.

9. A stent comprising:

a plurality of interconnected expandable framework members and a side branch structure;

the side branch structure defining an inner side branch cell, the inner side branch cell being shaped differently than other cells of the stent;

the side branch structure comprising a serpentine ring and a plurality of side branch connectors;

the serpentine ring comprising alternating struts and turns, each strut being concave with respect to a center point of the inner side branch cell;

each side branch connector connecting between a turn of the serpentine ring and at least one expandable framework member.

10. The stent of claim 9, wherein each side branch connector comprises a first portion and a second portion, the first portion being concave with respect to the center point of the inner side branch cell, the second portion being convex with respect to the center point of the inner side branch cell.

11. The stent of claim 9, at least one side branch connector comprising a first connector strut, a connector turn and a second connector strut, wherein the connector turn is connected to a turn of the serpentine ring.

13. The stent of claim 9, the serpentine ring being an outer serpentine ring, the side branch structure further comprising an inner serpentine ring located within the outer serpentine ring, the inner serpentine ring comprising alternating struts and turns, each strut being concave with respect to the center point of the inner side branch cell.

14. The stent of claim 13, wherein turns of the inner serpentine ring are connected to turns of the outer serpentine ring.

15. A stent comprising:

a first end region, a second end region and a central region, each region comprising a plurality of serpentine bands, the central region further comprising a side branch structure;

the side branch structure comprising a first parabolic support strut, a second parabolic support strut, a serpentine ring and a plurality of side branch connectors, the serpentine ring extending around a side branch center point, each parabolic support strut being concave with respect to the side branch center point;

at least one serpentine band in the central region connected at both ends to the first parabolic support strut;

at least one serpentine band in the central region connected at both ends to the second parabolic support strut;

at least one side branch connector connecting between the serpentine ring and the first parabolic support strut, and at least one side branch connector connecting between the serpentine ring and the second parabolic support strut.

16. The stent of claim 15, wherein the serpentine ring comprises alternating struts and turns, each strut being concave with respect to the side branch center point.

17. The stent of claim 16, wherein the struts of the serpentine ring comprise alternating first and second struts, the first struts being longer than the second struts.

18. The stent of claim 15, wherein a plurality of the side branch connectors each comprise a first connector strut, a connector turn and a second connector strut.

19. The stent of claim 18, having a plurality of side branch connectors wherein the first connector strut connects to a parabolic support strut and the second connector strut connects to a serpentine band.

20. The stent of claim 18, the serpentine ring comprising alternating struts and turns, the connector turns of the side branch connectors connecting to turns of the serpentine ring.