Intravascular stent apparatus

• US 20020045934A1
• Filed: 09/24/2001
• Published: 04/18/2002
• Est. Priority Date: 09/25/2000
• Status: Abandoned Application

• Current Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Jang, G. David
• Application Number:
  US09/962,792
• Publication Number:
  US 20020045934A1
• Time in Patent Office: Days
• 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 2002/825 having longitudinal struts
• 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 2002/91583 by a bridge, whereby at least one of its ends is connected along the length of a strut between two consecutive apices within a band
• CPC Class Codes: A61F 2230/0054 V-shaped

Abstract

Various intravascular stents, such as intracoronary stents, include improved expansion and connecting strut designs. Such stents can be both very flexible and fully cover vessel surface inside the vascular lumen, and be well designed for both the delivery phase and the deployed phase of the stent life cycle.

Claims

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

a first expansion column including individual expansion struts forming a plurality of expansion strut pairs, wherein two adjacent expansion strut pairs share a common strut;

a second expansion column including individual expansion struts forming a plurality of expansion strut pairs, wherein two adjacent expansion strut pairs share a common strut;

a first connecting strut column including a plurality of individual first connecting struts that couple the first and second expansion columns, wherein each of a first connecting strut in the first connecting strut column has a stair-step geometric configuration with a curvilinear proximal section and a curvilinear distal section.

2. The stent of claim 1, wherein each first connecting strut in a first connecting column has at least one curvilinear configuration in one of its proximal and distal sections.

3. The stent of claim 1, wherein at least one of the proximal and distal sections of each first connecting strut in the first connecting strut column is contralaterally conjoined to an expansion strut pair of the first and second expansion columns.

4. The stent of claim 1, wherein the proximal section of each first connecting strut in the first connecting strut column is contralaterally conjoined to an expansion strut pair of the first expansion column and its corresponding distal section is contralaterally conjoined to an expansion strut pair of the second expansion column.

5. The stent of claim 1, wherein each first connecting strut in the first connecting strut column has a proximal end that extends in a first direction and a distal end that extends in an opposite second direction.

6. The stent of claim 1, wherein each first connecting strut in the first connecting strut column has five sections.

7. The stent of claim 1, wherein each first connecting strut in the first connecting strut column has four pivot points.

8. The stent of claim 7, wherein each pivot point has at least one radius of curvature.

9. The stent of claim 1, wherein each first connecting strut in the first connecting strut column has an intermediate section coupled to the curvilinear proximal section and the curvilinear distal section.

10. The stent of claim 1, wherein each first connecting strut in the first connecting strut column has a longitudinal axis that is non-parallel to a longitudinal axis of the stent

11. The stent of claim 9, wherein each intermediate section of each first connecting strut of the first connecting strut column has a longitudinal axis that is non-parallel to the longitudinal axis of the first connecting strut.

12. The stent of claim 11, wherein each longitudinal axis of each intermediate section of each first connecting strut in the first connecting strut column is parallel to the longitudinal axis of the stent.

13. The stent of claim 10, wherein each first connecting strut in the first connecting strut column has the same longitudinal axis.

14. The stent of claim 10, wherein all of the first connecting struts in the first connecting strut column have parallel longitudinal axes.

15. The stent of claim 1, wherein each expansion strut in each expansion strut pair of the first and second expansion columns has a stair-step configuration.

16. The stent of claim 1, wherein one expansion strut of an expansion strut pair of the first expansion column has a stair-step segment at a proximal section and the other expansion strut of the expansion strut pair has a stair-step segment at a distal section.

17. The stent of claim 16, wherein one expansion strut of an expansion strut pair of the second expansion column has a stair-step segment at a distal section and the other expansion strut of the expansion strut pair has a stair-step segment at a proximal section.

18. The stent of claim 1, wherein at least a portion of the first connecting struts of the first connecting strut column have asymmetrical geometric configurations.

19. The stent of claim 1, wherein a terminal end of the proximal section of each first connecting strut in the first connecting column is conjoined to an expansion strut in the first expansion column, and a terminal end of the distal section of each first connecting strut is conjoined to an expansion strut in the second expansion column.

20. The stent of claim 1, wherein the proximal section of each first connecting strut has a surface that is conjoined to at least one surface of an expansion strut in the first expansion column, and the distal section of each first connecting strut has at least one surface that is conjoined to an expansion strut in the second expansion column.

21. The stent of claim 1, wherein the proximal and distal sections of each first connecting strut of the first connecting strut column have the same lengths.

22. The stent of claim 1, wherein each first connecting strut of the first connecting column is contralaterally conjoined to the first and second expansion columns.

23. The stent of claim 1, wherein at least a portion of the curvilinear proximal section of each first connecting strut of the first connecting strut column is in close proximity to an expansion strut pair of the first expansion column.

24. The stent of claim 1, wherein at least a portion of the curvilinear proximal section of each first connecting strut of the first connecting strut column is parallel to a portion of an expansion strut pair of the first expansion column.

25. The stent of claim 24, wherein at least a portion of the curvilinear distal section of each first connecting strut of the first connecting strut column is in close proximity to an expansion strut pair of the second expansion column.

26. The stent of claim 1, wherein at least a portion of the curvilinear distal section of each first connecting strut of the first connecting strut column is parallel to a portion of an expansion strut pair of the second expansion column.

27. The stent of claim 25, wherein close proximity is in the range of 0.001 to 0.050 of an inch.

28. The stent of claim 1, wherein distal ends of expansion strut pairs of the first expansion column that are coupled to proximal ends of expansion strut pairs of the second expansion column are vertically offset.

29. The stent of claim 1, further comprising:

a plurality of expansion columns coupled by a plurality of connecting strut columns

30. The stent of claim 29, further comprising:

a first end expansion column and a second end expansion column.

31. The stent of claim 30, wherein the first and second end expansion columns define a proximal and a distal end of the stent.

32. The stent of claim 30, wherein the first and second end expansion columns are mirror images of each other.

33. The stent of claim 1, wherein the first expansion column, the second expansion column and the first connecting strut column define a plurality of cells.

34. The stent of claim 33, wherein the plurality of cells have asymmetrical geometries.

35. The stent of claim 33, wherein the plurality of cells have evenly spaced geometric shapes.

36. The stent of claim 33, wherein the plurality of cells have a quasi-hexagonal geometry in a nominally expanded state.

37. The stent of claim 1, further comprising:

a third expansion column including individual expansion struts forming a plurality of expansion strut pairs, wherein two adjacent expansion strut pairs share a common strut;

a second connecting strut column including a plurality of individual second connecting struts that couple the second and third expansion columns, wherein each of a second connecting strut in the second connecting strut column has a stair-step geometric configuration with a curvilinear proximal section and a curvilinear distal section.

38. The stent of claim 37, wherein each first connecting strut of the first connecting strut column has a longitudinal axis that extends in a first direction, and each second connecting strut of the second connecting strut column has a longitudinal axis that extends in an opposite second direction.

39. The stent of claim 37, wherein distal ends of expansion strut pairs of the second expansion column that are coupled to proximal ends of expansion strut pairs of the third expansion column are vertically offset.

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

a first expansion column including individual expansion struts forming a plurality of expansion strut pair loops that couple adjacent individual expansion struts, wherein two adjacent expansion struts share a common strut;

a second expansion column including individual expansion struts forming a plurality of expansion strut pair loops that couple adjacent individual expansion struts, wherein two adjacent expansion struts share a common strut; and

a first connecting strut column including a plurality of individual connecting struts, wherein each of a first connecting strut in the first connecting strut column has a stair-step geometric configuration with a curvilinear proximal section and a curvilinear distal section.

41. The stent of claim 40, wherein at least a portion of the expansion strut pair loops have a radius of curvature.

42. The stent of claim 40, wherein at least a portion of the curvilinear proximal section of each first connecting strut of the first connecting strut column is parallel to at least a portion of the radius of curvature of an expansion strut pair loop in the first expansion column.

43. The stent of claim 40, wherein at least a portion of the curvilinear distal section of each first connecting strut of the first connecting strut column is parallels to at least a portion of the radius of curvature of an expansion strut pair loop in the second expansion column.

44. The stent of claim 40, wherein at least one of the proximal and distal curvilinear sections of each first connecting strut of the first connecting strut column is parallel to at least a portion of the radius of curvature of one of the expansion strut pair loops in the first and second expansion columns.

45. The stent of claim 40, wherein at least one of the proximal and distal sections of each first connecting strut in the first connecting strut column is contralaterally conjoined to an expansion strut pair of the first and second expansion columns.

46. The stent of claim 40, wherein the proximal section of each first connecting strut in the first connecting strut column is contralaterally conjoined to an expansion strut pair of the first expansion column and its corresponding distal section is contralaterally conjoined to an expansion strut pair of the second expansion column.

47. The stent of claim 40, wherein each first connecting strut in the first connecting strut column has a proximal end that extends in a first direction and a distal end that extends in an opposite second direction.

48. The stent of claim 40, wherein each first connecting strut in the first connecting strut column has five sections.

49. The stent of claim 40, wherein each first connecting strut in the first connecting strut column has four pivot points.

50. The stent of claim 49, wherein each pivot point has at least one radius of curvature.

51. The stent of claim 40, wherein each first connecting strut in the first connecting strut column has an intermediate section coupled to the curvilinear proximal section and the curvilinear distal section.

52. The stent of claim 51, wherein each first connecting strut in the first connecting strut column has a longitudinal axis that is non-parallel to a longitudinal axis of the stent.

53. The stent of claim 52, wherein each intermediate section of each first connecting strut of the first connecting strut column has a longitudinal axis that is non-parallel to the longitudinal axis of the first connecting strut.

54. The stent of claim 52, wherein each first connecting strut in the first connecting strut column has the same longitudinal axis.

55. The stent of claim 52, wherein all of the first connecting struts in the first connecting strut column have parallel longitudinal axes.

56. The stent of claim 40, wherein each connecting strut in the first connecting strut column has at least two radii of curvature at its proximal section and at least two radii of curvature at its distal section.

57. The stent of claim 40, wherein each expansion strut in each expansion strut pair loop of the first and second expansion columns has a stair-step configuration.

58. The stent of claim 40, wherein one expansion strut of an expansion strut pair loop of the first expansion column has a stair-step segment at a proximal section and the other expansion strut of the expansion strut pair has a stair-step segment at a distal section.

59. The stent of claim 58, wherein one expansion strut of an expansion strut pair loop of the second expansion column has a stair-step segment at a distal section and the other expansion strut of the expansion strut pair has a stair-step segment at a proximal section.

60. The stent of claim 40, wherein at least at least a portion of the first connecting struts of the first connecting strut column have asymmetrical geometric configurations.

61. The stent of claim 40, wherein a terminal end of the proximal section of each first connecting strut in the first connecting column is conjoined to an expansion strut in the first expansion column, and a terminal end of the distal section of each first connecting strut is conjoined to an expansion strut in the second expansion column.

62. The stent of claim 40, wherein the proximal section of each first connecting strut has a surface that is conjoined to at least one surface of an expansion strut of an expansion strut pair loop in the first expansion column, and the distal section of each first connecting strut has at least one surface that is conjoined to an end of an expansion strut of an expansion strut pair loop in the second expansion column.

63. The stent of claim 40, wherein the proximal and distal sections of each first connecting strut of the first connecting strut column have the same lengths.

64. The stent of claim 40, wherein each first connecting strut of the first connecting column is contralaterally conjoined to the first and second expansion columns.

65. The stent of claim 40, wherein at least a portion of the proximal section of each first connecting strut of the first connecting strut column is in close proximity to an expansion strut pair of the first expansion column.

66. The stent of claim 65, wherein at least a portion of distal section of each first connecting strut of the first connecting strut column is in close proximity to an expansion strut pair of the second expansion column.

67. The stent of claim 65, wherein close proximity is in the range of 0.001 to 0.050 of an inch.

68. The stent of claim 40, wherein distal ends of expansion strut pair loops of the first expansion column that are coupled to proximal ends of expansion strut pairs of the second expansion column are vertically offset.

69. The stent of claim 40, further comprising:

a plurality of expansion columns coupled by a plurality of connecting strut columns.

70. The stent of claim 69, further comprising:

a first end expansion column and a second end expansion column.

71. The stent of claim 70, wherein the first and second end expansion columns define a proximal and a distal end of the stent.

72. The stent of claim 70, wherein the first and second end expansion columns are mirror images of each other.

73. The stent of claim 40, wherein the first expansion column, the second expansion column and the first connecting strut column define a plurality of cells.

74. The stent of claim 73, wherein the plurality of cells have asymmetrical geometries.

75. The stent of claim 73, wherein the plurality of cells have evenly spaced geometric shapes with a quasi-hexagonal geometry in a nominally expanded state.

76. The stent of claim 40, further comprising:

a third expansion column including individual expansion struts forming a plurality of expansion strut pair loops that couple adjacent individual expansion struts, wherein two adjacent expansion struts share a common strut; and

a second connecting strut column including a plurality of individual connecting struts each with a proximal section and a distal section, wherein each of a second connecting strut in the second connecting strut column has a stair-step geometric configuration with a curvilinear proximal section and a curvilinear distal section.

77. The stent of claim 76, wherein at least a portion of the expansion strut pair loops has a radius of curvature.

78. The stent of claim 76, wherein at least a portion of the curvilinear proximal section of each second connecting strut of the second connecting strut column is parallel to at least a portion of the radius of curvature of an expansion strut pair loop in the second expansion column.

79. The stent of claim 76, wherein at least a portion of the curvilinear distal section of each second connecting strut of the second connecting strut column is parallel to at least a portion of the radius of curvature of an expansion strut pair loop in the third expansion column.

80. The stent of claim 76, wherein at least one of the proximal and distal curvilinear sections of each second connecting strut of the second connecting strut column is parallel to at least a portion of the radius of curvature of one of the expansion strut pair loops in the first and second expansion columns.

81. The stent of claim 76, wherein at least a portion of the proximal section of each second connecting strut of the second connecting strut column is in close proximity to an expansion strut pair loop of the second expansion column.

82. The stent of claim 76, wherein at least a portion of the distal section of each second connecting strut of the second connecting strut column is in close proximity to an expansion strut pair loop of the second expansion column.

83. The stent of claim 81, wherein close proximity is in the range of 0.001 to 0.050 of an inch.

84. The stent of claim 76, wherein each first connecting strut of the first connecting strut column has a longitudinal axis that extends in a first direction, and each second connecting strut of the second connecting strut column has a longitudinal axis that extends in an opposite second direction.

85. The stent of claim 76, wherein distal ends of expansion strut pairs of the second expansion column that are coupled to proximal ends of expansion strut pairs of the third expansion column are vertically offset.

86. The stent of claim 76, wherein expansion strut pair loops of the second and third expansion columns are aligned in a peak-to-valley geometry.

87. The stent of claim 76, wherein expansion strut pair loops of the second and first expansion columns are aligned in a valley-to-peak geometry.

88. The stent of claim 76, wherein expansion strut pair loops of the second and third expansion columns are aligned in a peak-to-peak geometry.

89. The stent of claim 40, further comprising:

a first end expansion column and a second end expansion column.

90. The stent of claim 89, wherein the first and second end expansion columns define a proximal and a distal end of the stent.

91. The stent of claim 89, wherein the first and second end expansion columns are mirror images of each other.