Intravascular stent

• US 5,954,743 A
• Filed: 03/26/1997
• Issued: 09/21/1999
• Est. Priority Date: 04/26/1996
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Jang G. David
• Inventors: Jang, G. David
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): LEWIS, WILLIAM W
• Application Number:
  US08/824,866
• Time in Patent Office: 909 Days
• Field of Search: 606/1, 606/108, 606/191, 606/194, 606/195, 606/198, 606/200, 623/1, 623/12, 128/898, 128/899
• 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 2/958 Inflatable balloons for placing stents or stent-grafts
• 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 2250/0018 differing in elasticity, stiffness or compressibility

Abstract

A stent in a non-expanded state has a first expansion strut that includes a first expansion strut positioned adjacent to a second expansion strut. A joining strut of the first expansion strut pair couples the first and second expansion struts at a distal end of the first expansion strut pair. A plurality of the first expansion strut pair form a first expansion column. A second expansion strut pair includes a first expansion strut positioned adjacent to a second expansion strut. A joining strut of the second expansion strut pair couples the first and second expansion struts of the second expansion strut pair at a proximal end of the second expansion strut pair. A plurality of the second expansion strut pair form a second expansion column. A first connecting strut includes a first connecting strut proximal section and a first connecting strut distal section. The first connecting strut proximal section is coupled to the distal end of the first expansion strut pair in the first expansion column.

Claims

1. A stent in a non-expanded state, comprising:

a first expansion strut pair including a first expansion strut positioned adjacent to a second expansion strut and a joining strut of the first expansion strut pair that couples the first and second expansion struts at a distal end of the first expansion strut pair, a plurality of the first expansion strut pair forming a first expansion column;

a second expansion strut pair including a first expansion strut positioned adjacent to a second expansion strut and a joining strut of the second expansion strut pair that couples the first and second expansion struts of the second expansion strut pair at a proximal end of the second expansion strut pair, a plurality of the second expansion strut pair forming a second expansion column;

a first connecting strut including a first connecting strut proximal section and a first connecting strut distal section, the first connecting strut proximal section being coupled to the distal end of the first expansion strut pair in the first expansion column and the first connecting strut distal section being coupled to the proximal end of the second expansion strut pair of the second expansion column, a plurality of the first connecting strut forming a first connecting strut column that couples the first expansion column to the second expansion column;

a third expansion strut pair including a first expansion strut positioned adjacent to a second expansion strut and a third joining strut of the third expansion strut pair that couples the first and second expansion struts at a proximal end of the third expansion strut pair, a plurality of the third expansion strut pair forming a third expansion column;

a second connecting strut including a second connecting strut proximal section and a second connecting strut distal section, the second connecting strut proximal section being coupled to the distal end of the second expansion strut pair in the second expansion column, the second connecting strut distal section being coupled to the proximal end of the third expansion strut pair of the third expansion column, a plurality of the second connecting strut forming a second connecting strut column that couples the second expansion column to the third expansion column; and

wherein the first expansion strut of the first expansion strut pair in the first expansion column has a longitudinal axis offset from a longitudinal axis of the first expansion strut of the second expansion strut pair in the second expansion column.

2. The strut of claim 1, wherein the second expansion strut of the third expansion strut pair in the third expansion column has a longitudinal axis that is offset from a longitudinal axis of the first expansion strut of the second expansion strut pair of the second expansion column.

3. The stent of claim 1, wherein at least a portion of the first connecting struts include a proximal section, a distal section, a first linear section and a first slant angle.

4. The stent of claim 3, wherein at least a portion of the first connecting struts including a first slant angle have a second linear section coupled to the first linear section and the first slant angle is formed between the first and second linear sections.

5. The stent of claim 4, wherein at least a portion of the second connecting struts include a proximal section, a distal section, a first linear section and a second slant angle.

6. The stent of claim 3, wherein each of the first slant angles is directed in a first circumferential direction.

7. The stent of claim 3, wherein the first connecting strut includes a third slant angle.

8. The stent of claim 1, wherein a ratio of a number of expansion struts in an expansion strut column to a number of connecting struts in a connecting strut column is 2 to 1.

9. The stent of claim 1, wherein the stent includes m first and second expansion columns, n expansion struts per column and n (m-1)/2 connecting struts.

10. The stent of claim 1, wherein the first and second expansion columns are each unbroken, continuous structures.

11. The stent of claim 1, wherein a width of a portion of the first connecting struts is equal to or less than a width of a portion of the first expansion struts.

12. The stent of claim 1, wherein a width of a portion of the first connecting struts is larger than a width of a portion of the first expansion struts.

13. The stent of claim 1, wherein a width of a portion of the second expansion struts is substantially the same as a width of a portion of the first expansion struts.

14. The stent of claim 1, further comprising:

a reenforcement expansion column made of a plurality of reenforcement expansion struts, wherein each reenforcement expansion strut has a width that is greater than a width of an expansion strut in the first or second expansion columns.

15. The stent of claim 1, wherein the stent has a proximal end with a first reenforcement expansion column and a distal end with a second reenforcement expansion column.

16. The stent of claim 1, wherein at least a portion of the first connecting struts have a first radius of curvature.

17. The stent of claim 16, wherein the portion of the first connecting struts with the first radius of curvature have a second radius of curvature.

18. The stent of claim 1, wherein at least a portion of the first connecting struts have first linear sections coupled to joining struts of first expansion strut pairs and second linear sections coupled to joining struts of second expansion strut pairs.

19. The stent of claim 1, wherein at least a portion of the first connecting struts have first linear sections coupled to joining struts of first expansion strut pairs, second linear sections coupled to joining struts of second expansion strut pairs and third linear sections coupling the first and second linear sections.

20. The stent of claim 1, wherein at least a portion of the first connecting struts have first linear sections coupled to joining struts of first expansion strut pairs, second linear sections coupled to joining struts of second expansion strut pairs, third and fourth linear sections coupling the first and second linear sections.

21. The stent of claim 1, wherein the stent further includes a radiopaque marker.

22. The stent of claim 1, wherein the stent includes an electroplated radiopaque material.

23. The stent of claim 1, wherein the first expansion strut of the first expansion strut pair in the first expansion column and the second expansion strut of the third expansion strut pair in the third expansion column have the same longitudinal axis.

24. The stent of claim 1, wherein the second expansion strut of the first expansion pair in the first expansion column and the first expansion strut of the second expansion pair in the second expansion column have the same longitudinal axis.

25. The stent of claim 1, wherein in an expanded state the stent has a tapered diameter.

26. The stent of claim 1, wherein in an expanded state the stent has a tapered geometry extending from a proximal end to a distal end.

47. The stent of claim 25, wherein the stent further includes a radiopaque marker.

48. The stent of claim 25, wherein the stent includes an electroplated material.

49. The stent of claim 25, wherein the first expansion strut of the first expansion strut pair and the second expansion strut of the third expansion strut pair have the same longitudinal axis.

50. The stent of claim 25, wherein the second expansion strut of the first expansion pair and the first expansion strut of the second expansion pair have the same longitudinal axis.

75. The stent of claim 1, wherein the stent has a proximal end with a first reenforcement expansion column, a distal end with a second reenforcement expansion column and a third reenforcement expansion column between the proximal and distal ends.

76. The stent of claim 1, wherein the stent includes an electroplated radiopaque material at a stent distal and and at a stent proximal end.

27. A stent in a non-expanded state, comprising:

a first expansion strut pair including a first expansion strut positioned adjacent to a second expansion strut and a joining strut of the first expansion strut pair that couples the first and second expansion struts at a distal end of the first expansion strut pair, a plurality of the first expansion strut pair forming a first expansion column;

a second expansion strut pair including a first expansion strut positioned adjacent to a second expansion strut and a joining strut of the second expansion strut pair that couples the first and second expansion struts of the second expansion strut pair at a proximal end of the second expansion strut pair, a plurality of the second expansion strut pair forming a second expansion column;

a first connecting strut including a first connecting strut proximal head section and a first connecting strut distal tail section, the head section being coupled to the distal end of the first expansion strut pair of the first expansion column and the tail section being coupled to the proximal end of the second expansion strut pair of the second expansion column, a plurality of the first connecting strut forming a first connecting strut column that couples the first expansion column to the second expansion column, wherein the first connecting strut tail section extends in a first lateral direction relative to a longitudinal axis of the first connecting strut head section to form a first slant angle extending in a first circumferential direction;

a third expansion strut pair including a first expansion strut positioned adjacent to a second expansion strut and a third joining strut of the third expansion strut pair that couples the first and second expansion struts at a proximal end of the third expansion strut pair, a plurality of the third expansion strut pair forming a third expansion column;

a second connecting strut including a proximal head section and a distal tail section, the head section being coupled to the distal end of the second expansion strut pair in the second expansion column and the tail section being coupled to the proximal end of the third expansion strut pair of the third expansion column, a plurality of the second connecting strut forming a second connecting strut column that couples the second expansion column to the third expansion column, wherein the tail section extends in a second lateral direction relative to a longitudinal axis of the head section to form a second slant angle extending in a second circumferential direction opposite the first circumferential direction of the first slant angle; and

wherein the first expansion strut of the first expansion strut pair in the first expansion column has a longitudinal axis that is parallel to and offset from a longitudinal axis of the first expansion strut of the second expansion strut pair in the second expansion column.

28. The stent of claim 27, wherein the first expansion strut of the third expansion strut pair in the third expansion column has a longitudinal axis that is parallel to and offset from a longitudinal axis of the first expansion strut of the second expansion strut pair of the second expansion column.

29. The stent of claim 27, wherein at least a portion of the first connecting struts include a proximal section, a distal section, a first linear section and a first slant angle.

30. The stent of claim 27, wherein at least a portion of the first connecting struts including a first slant angle have a second linear section coupled to the first linear section and the first slant angle is formed between the first and second linear sections.

31. The stent of claim 30, wherein at least a portion of the second connecting struts include a proximal section, a distal section, a first linear section and a second slant angle.

32. The stent of claim 27, wherein a ratio of a number of expansion struts in an expansion strut column to a number of connecting struts in a connecting strut column is 2 to 1.

33. The stent of claim 27, wherein the stent includes m first and second expansion columns, n expansion struts per column and n (m-1)/2 connecting struts.

34. The stent of claim 27, wherein the first and second expansion columns are each unbroken, continuous structures.

35. The stent of claim 27, wherein each of the first slant angles is directed in a first circumferential direction.

36. The stent of claim 27, wherein the first connecting strut includes a third slant angle.

37. The stent of claim 27, wherein a width of a portion of the first connecting struts is equal to or less than a width of a portion of the first expansion struts.

38. The stent of claim 27, wherein a width of a portion of the first connecting struts is larger than a width of a portion of the first expansion struts.

39. The stent of claim 27, wherein a width of a portion of the second expansion struts is substantially the same as a width of a portion of the first expansion struts.

40. The stent of claim 27, further comprising:

a reenforcement expansion column made of a plurality of reenforcement expansion struts, wherein each reenforcement expansion strut has a width that is greater than a width of an expansion strut in the first or second expansion columns.

41. The stent of claim 27, wherein the stent has a proximal end with a first reenforcement expansion column and a distal end with a second reenforcement expansion column.

42. The stent of claim 27, wherein at least a portion of the first connecting struts have a first radius of curvature.

43. The stent of claim 42, wherein the portion of the first connecting struts with the first radius of curvature have a second radius of curvature.

44. The stent of claim 27, wherein at least a portion of the first connecting struts have first linear sections coupled to joining struts of first expansion strut pairs and second linear sections coupled to joining struts of second expansion strut pairs.

45. The stent of claim 27, wherein at least a portion of the first connecting struts have first linear sections coupled to joining struts of first expansion strut pairs, second linear sections coupled to joining struts of second expansion strut pairs and third linear sections coupling the first and second linear sections.

46. The stent of claim 27, wherein at least a portion of the first connecting struts have first linear sections coupled to joining struts of first expansion strut pairs, second linear sections coupled to joining struts of second expansion strut pairs, third and fourth linear sections coupling the first and second linear sections.

73. The stent of claim 27, wherein in an expanded state the stent has a tapered diameter.

74. The stent of claim 27, wherein in an expanded state the stent has a tapered geometry extending from a proximal end to a distal end.

77. The stent of claim 27, wherein the stent has a proximal end with a first reenforcement expansion column, a distal end with a second reenforcement expansion column and a third reenforcement expansion column between the proximal and distal ends.

78. The stent of claim 27, wherein the stent includes an electroplated material at a stent proximal end and at a stent distal end.

51. A stent in a non-expanded state, comprising:

a first expansion strut pair including a first expansion strut positioned adjacent to a second expansion strut and a joining strut of the first expansion strut pair that couples the first and second expansion struts at a distal end of the first expansion strut pair, a plurality of the first expansion strut pair forming a first expansion column;

a second expansion strut pair including a first expansion strut positioned adjacent to a second expansion strut and a joining strut of the second expansion strut pair that couples the first and second expansion struts of the second expansion strut pair at a proximal end of the second expansion strut pair, a plurality of the second expansion strut pair forming a second expansion column;

a first connecting strut including a first connecting strut proximal head section and a first connecting strut distal tail section, the head section being coupled to the distal end of the first expansion strut pair in the first expansion column and the tail section being coupled to the proximal end of the second expansion strut pair of the second expansion column, a plurality of the first connecting strut forming a first connecting strut column that couples the first expansion column to the second expansion column, the tail section extending in a first lateral direction relative to a longitudinal axis of the head section to form a first slant angle extending in a first circumferential direction;

a third expansion strut pair including a first expansion strut positioned adjacent to a second expansion strut and a third joining strut of the third expansion strut pair that couples the first and second expansion struts at a proximal end of the third expansion strut pair, a plurality of the third expansion strut pair forming a third expansion column, the first expansion strut of the first expansion strut pair in the first expansion column having a longitudinal axis that is parallel to and offset from a longitudinal axis of the first expansion strut of the second expansion strut pair in the second expansion column, and the second expansion strut of the third expansion strut pair in the third expansion column has a longitudinal axis that is parallel to and offset from a longitudinal axis of first expansion strut of the second expansion strut pair of the second expansion column, a plurality of the third expansion strut pair forming a third expansion column;

a second connecting strut including a proximal head section and a distal tail section, the head section being coupled to the distal end of the second expansion strut pair in the second expansion column and the tail section being coupled to the proximal end of the third expansion strut pair of the third expansion column, a plurality of the second connecting strut forming a second connecting strut column that couples the second expansion column to the third expansion column, wherein the tail section extends in a second lateral direction relative to a longitudinal axis of the head section to form a second slant angle extending in a second circumferential direction opposite the first circumferential direction of the first slant angle; and

wherein a ratio of a number of expansion struts to a number of connecting struts is selected to provide a sufficient stent flexibility to permit introduction of the stent through a selected blood vessel.

52. The stent of claim 51, wherein a ratio of a number of expansion struts in an expansion strut column to a number of connecting struts in a connecting strut column is 2 to 1.

53. The stent of claim 51, wherein the stent includes m first and second expansion columns, n expansion struts per column and n (m-1)/2 connecting struts.

54. The stent of claim 51, wherein the first and second expansion columns are each unbroken, continuous structures.

55. The stent of claim 51, wherein each of the first slant angles is directed in a first circumferential direction.

56. The stent of claim 51, wherein the first connecting strut includes a third slant angle.

57. The stent of claim 51, wherein a width of a portion of the first connecting struts is equal to or less than a width of a portion of the first expansion struts.

58. The stent of claim 51, wherein a width of a portion of the first connecting struts is larger than a width of a portion of the first expansion struts.

59. The stent of claim 51, wherein a width of a portion of the second expansion struts is substantially the same as a width of a portion of the first expansion struts.

60. The stent of claim 51, further comprising:

a reenforcement expansion column made of a plurality of reenforcement expansion struts, wherein each reenforcement expansion strut has a width that is greater than a width of an expansion strut in the first or second expansion columns.

61. The stent of claim 51, wherein the stent has a proximal end with a first reenforcement expansion column and a distal end with a second reenforcement expansion column.

62. The stent of claim 51, wherein at least a portion of the first connecting struts have a first radius of curvature.

63. The stent of claim 62, wherein the portion of the first connecting struts with the first radius of curvature have a second radius of curvature.

64. The stent of claim 51, wherein at least a portion of the first connecting struts have first linear sections coupled to joining struts of first expansion strut pairs and second linear sections coupled to joining struts of second expansion strut pairs.

65. The stent of claim 51, wherein at least a portion of the first connecting struts have first linear sections coupled to joining struts of first expansion strut pairs, second linear sections coupled to joining struts of second expansion strut pairs and third linear sections coupling the first and second linear sections.

66. The stent of claim 51, wherein at least a portion of the first connecting struts have first linear sections coupled to joining struts of first expansion strut pairs, second linear sections coupled to joining struts of second expansion strut pairs and third and fourth linear sections coupling the first and second linear sections.

67. The stent of claim 57, wherein the stent further includes a radiopaque marker.

68. The stent of claim 51, wherein the stent includes an electroplated material.

69. The stent of claim 51, wherein the first expansion strut of the first expansion strut pair and the second expansion strut of the third expansion strut pair have the same longitudinal axis.

70. The stent of claim 51, wherein the second expansion strut of the first expansion strut pair and the first expansion strut of the second expansion strut pair have the same longitudinal axis.

71. The stent of claim 51, wherein the first expansion strut of the first expansion strut pair in the first expansion column and the second expansion strut of the third expansion strut pair in the third expansion column have the same longitudinal axis.

72. The stent of claim 51, wherein the second expansion strut of the first expansion strut pair in the first expansion column and the first expansion strut of the second expansion strut pair in the second expansion column have the same longitudinal axis.

79. The stent of claim 51, wherein the stent has a proximal end with a first reenforcement expansion column, a distal end with a second reenforcement expansion column and a third reenforcement expansion column between the proximal and distal ends.

80. The stent of claim 51, wherein the stent includes an electroplated material at a stent proximal end and at a stent distal end.