Bifurcation stent pattern

• US 20070150046A1
• Filed: 12/22/2005
• Published: 06/28/2007
• Est. Priority Date: 12/22/2005
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: Gregorich, Daniel, Meyer, Michael, Sorenson, Shawn, Tooley, Richard
• Granted Patent: US 7,540,881 B2
• Time in Patent Office: Days
• US Class Current: 623/1.150
• 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 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/91566 connected trough to trough
• CPC Class Codes: A61F 2002/91575 connected peak to trough

Abstract

A stent may comprise a plurality of serpentine bands connected by connector struts. The stent may further comprise a side branch cell having a plurality of outwardly deployable petals. Each serpentine band may have an approximate longitudinal axis. A portion of the serpentine bands may be flared in the unexpanded state, wherein a portion of the axis of each flared band is oriented helically about a portion of the stent. The bands may reorient during stent expansion, whereafter the axis of each band is oriented in a circumferential direction.

Claims

1. A stent having a proximal end and a distal end, the stent comprising:

a plurality of interconnected strut members defining a plurality of cells, a portion of the interconnected strut members comprising a side branch structure defining a side branch cell, the side branch cell being shaped differently than other cells of the stent;

the interconnected strut members further defining a plurality of serpentine bands and a plurality of connector struts, adjacent serpentine bands connected by at least one connector strut;

a first serpentine band having a first band axis, at least a portion of the first band axis extending generally circumferentially about a portion of the stent;

a second serpentine band having a second band axis, at least ¼

of the length of the second band axis extending generally helically about a portion of the stent.

2. The stent of claim 1, wherein the first serpentine band is located at an end of the stent.

3. The stent of claim 1, wherein the second serpentine band is connected to the side branch structure.

4. The stent of claim 3, further comprising a third serpentine band, the third serpentine band adjacent to the second serpentine band;

a connector strut connecting at one end to a distal valley of the second serpentine band and at another end to a proximal peak of the third serpentine band.

5. The stent of claim 4, wherein the third serpentine band is connected to the side branch structure.

6. The stent of claim 4, further comprising a fourth serpentine band, the fourth serpentine band adjacent to the second serpentine band;

a connector strut connecting at one end to a distal valley of the fourth serpentine band and at another end to a proximal peak of the second serpentine band.

7. The stent of claim 6, wherein the fourth serpentine band is connected to the side branch structure.

8. The stent of claim 3, wherein the second serpentine band comprises a plurality of struts connected by turns, and at least four turns are located between the side branch structure and a connector strut connected to the second serpentine band.

9. The stent of claim 1 in an unexpanded state.

10. The stent of claim 9, wherein after expansion of the stent, at least a portion of the second band axis extends circumferentially about a portion of the stent.

11. A stent, a flat pattern for the stent comprising:

a plurality of interconnected strut members defining a plurality of cells, a portion of the interconnected strut members comprising a side branch structure defining a side branch cell, the side branch cell being shaped differently than other cells of the stent;

the interconnected strut members further defining a plurality of serpentine bands and a plurality of connector struts, adjacent serpentine bands connected by at least one connector strut;

a first serpentine band having a first band axis, at least a portion of the first band axis extending perpendicular to a stent lengthwise axis;

a second serpentine band having a second band axis, at least ¼

of the length of the second band axis extending at a non-perpendicular angle to the stent lengthwise axis.

12. The stent of claim 11, wherein the second serpentine band is connected to the side branch structure.

13. The stent of claim 12, further comprising a third serpentine band, the third serpentine band adjacent to the second serpentine band;

a connector strut connecting at one end to a distal valley of the second serpentine band and at another end to a proximal peak of the third serpentine band.

14. The stent of claim 13, further comprising a fourth serpentine band, the fourth serpentine band adjacent to the second serpentine band;

a connector strut connecting at one end to a distal valley of the fourth serpentine band and at another end to a proximal peak of the second serpentine band.

15. The stent of claim 11 in an unexpanded state, wherein after expansion of the stent, at least a portion of the second band axis extends circumferentially about a portion of the stent.

16. A stent comprising:

a plurality of interconnected strut members defining a plurality of cells, a portion of the interconnected strut members comprising a side branch structure defining a side branch cell, the side branch cell being shaped differently than other cells of the stent;

the interconnected strut members further defining a plurality of serpentine bands and a plurality of connector struts, adjacent serpentine bands connected by at least one connector strut, each serpentine band comprising a plurality of proximal peaks and distal valleys;

a first serpentine band connected to the side branch structure;

a second serpentine band connected to the side branch structure;

a third serpentine band, the third serpentine band not directly connected to the side branch structure;

a fourth serpentine band, the fourth serpentine band not directly connected to the side branch structure;

a first connector strut connected at one end to a distal valley of the first serpentine band and connected at a second end to a proximal peak of the second serpentine band; and

a second connector strut connected at one end to a distal valley of the third serpentine band and connected at a second end to a distal valley of the fourth serpentine band.

17. The stent of claim 16, further comprising a third connector strut connected at one end to a proximal peak of the fourth serpentine band and connected at a second end to a distal valley of another serpentine band.

18. The stent of claim 16, wherein the first serpentine band includes a first band axis, at least a portion of the first band axis extending circumferentially about a portion of the stent.

19. The stent of claim 16, wherein the second serpentine band includes a second band axis, at least a portion of the second band axis extending helically about a portion of the stent when the stent is unexpanded.

20. The stent of claim 19, wherein after expansion of the stent, at least a portion of the second band axis extends circumferentially about a portion of the stent.