Stent cell configurations

• US 6,395,020 B1
• Filed: 03/03/1999
• Issued: 05/28/2002
• Est. Priority Date: 03/04/1998
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Kveen, Graig L., Ley, Timothy J., Doran, Burns P.
• Primary Examiner(s): Recla, Henry J.
• Assistant Examiner(s): Bui, Vy Q.
• Application Number:
  US09/261,687
• Time in Patent Office: 1,182 Days
• Field of Search: 623/1.11,1.12,1.13,1.14,1.15,1.16,1.17,1.18,1.19,1.2,1.21,1.22,1.23 606/108,191,194,195,198
• US Class Current: 623/1.15
• 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 2002/91533 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

Abstract

A generally cylindrical, radially expandable stent may be composed of a plurality of interconnected multibonate cell structures. The cells have three or more enlarged end portions radiating from a common center within the cell. The cells may be of tribonate or higher order multibonate configuration. Stents composed up of a series of generally multibonate cell elements are also disclosed.

Claims

1. A stent of generally cylindrical shape having a longitudinal axis, the stent comprised of at least one multibonate cell structure, the multibonate cell structure having at least three end portions, at least two of the end portions defining openings axis of which are non-parallel to the longitudinal axis of the stent each defining an opening along a longitudinal axis thereof.

2. The stent of claim 1 comprised of a plurality of interconnected multibonate cell structures.

3. The stent of claim 2 wherein the multibonate cell structures are regularly arranged.

4. The stent of claim 2 wherein at least one of the multibonate cell structures is tribonate, having:

a common portion;

a first connecting portion extending from the common portion;

a first end portion extending from the first connecting portion;

a second connecting portion extending from the common portion;

a second end portion extending from the second connecting portion;

a third connecting portion extending from the common portion; and

a third end portion extending from the third connecting portion.

5. The stent of claim 4 wherein the multibonate structures are arranged in interconnected longitudinal rows.

6. The stent of claim 5 wherein a plurality of the multibonate cell structures are tribonate.

7. The stent of claim 6 wherein adjacent rows of multibonate structures have connecting members extending therebetween.

8. The stent of claim 6 wherein adjacent multibonate structures within a row are interlocking.

9. The stent of claim 6 wherein adjacent rows of multibonate structures have connecting members extending therebetween, the connecting members being bonate cell structures.

10. The stent of claim 9 wherein each bonate cell structure is disposed at an oblique angle relative to the longitudinal axis.

11. The stent of claim 10 wherein the bonate cell structures are arranged in longitudinal rows,

all of the bonate cells within a row disposed at the same oblique angle,

bonate cell structures in adjacent rows of bonate structures oppositely disposed about a line parallel to the longitudinal axis of the stent extending between the adjacent rows of bonate structures and equidistant from the adjacent rows of bonate structures.

12. The stent of claim 6 wherein all of the multibonate structures are tribonate and tribonate structures in adjacent rows of multibonate structures are rotated 180°

relative to one another.

13. The stent of claim 6 wherein all of the multibonate structures are tribonate and tribonate structures in adjacent rows of multibonate structures are identically oriented relative to the longitudinal axis of the stent.

14. The stent of claim 6 wherein each multibonate structure is defined by a plurality of interconnected side portions and at least some of the multibonate structures have a side portion in common.

15. The stent of claim 14 wherein the multibonate structures are tribonate.

16. The stent of claim 15 wherein the multibonate structures are disposed in longitudinal rows and adjacent multibonate structures in adjacent rows of multibonate structures share at least one side portion in common.

17. The stent of claim 6 wherein the tribonate structure has a threefold rotational axis of symmetry in the flat.

18. The stent of claim 6 wherein the tribonate structure has a single plane of reflectional symmetry σ

_v.

19. The stent of claim 6 wherein the second and third connecting portions are substantially the same length.

20. The stent of claim 6 wherein all three connecting portions are substantially the same length.

21. The stent of claim 6 where at least one of the end portions is substantially triangular in shape.

22. The stent of claim 21 wherein the substantially triangular end portion has convex sides.

23. The stent of claim 6 wherein at least two of the end portions are substantially rectangular in shape.

24. The stent of claim 23 wherein the substantially rectangular end portions are formed of

a first side portion extending from the connecting portion;

a second side portion opposite the first side portion and extending from the connecting portion; and

an end base portion extending between the first and second side portions, wherein the base portion is substantially linear.

25. The stent of claim 23 wherein the substantially rectangular end portions are formed of

a first side portion extending from the connecting portion;

a second side portion opposite the first side portion and extending from the connecting portion; and

an end base portion extending between the first and second side portions, wherein the base portion is a convex curve.

26. The stent of claim 6 wherein at least some of the multibonate structures are hexabonate structures.

27. The stent of claim 26 wherein adjacent hexabonate structures have at least one side in common.

28. The stent of claim 26 further comprising tribonate structures.

29. The stent of claim 28 wherein the hexabonate and tribonate structures are interlocking.

30. The stent of claim 8 comprising at least one multibonate structure of n^th order and at least one multibonate structure of m^th order

where n and m are integers greater than 2;

and

n≠

m.

31. The stent of claim 6 wherein all of the multibonate cell structures are of the same tribonate cell structure.

32. The stent of claim 6 comprising interconnected quadribonate cell structures.

33. A stent of generally cylindrical shape having a longitudinal axis, the stent comprised of a plurality of multibonate cell structures, wherein all of the multibonate cell structures are tribonate, each tribonate structure having

a common portion;

a first connecting portion extending from the common portion;

a first end portion extending from the first connecting portion;

a second connecting portion extending from the common portion;

a second end portion extending from the second connecting portion;

a third connecting portion extending from the common portion; and

a third end portion extending from the third connecting portion

wherein at least two of the end portions defining openings which are non-parallel to the longitudinal axis of the stent.

34. The stent of claim 33 wherein the multibonate structures are arranged in interconnected longitudinal rows.