Plain woven stents

• US 8,414,635 B2
• Filed: 05/22/2008
• Issued: 04/09/2013
• Est. Priority Date: 02/01/1999
• Status: Expired due to Fees

• Current Assignee: Board of Regents of the University of Texas System (University of Texas System)
• Original Assignee: Idev Technologies, Inc. (Abbott Laboratories)
• Inventors: Hyodoh, Hideki, Konya, Andras, Wright, Kenneth C.
• Primary Examiner(s): NGUYEN, TUAN VAN
• Application Number:
  US12/125,811
• Publication Number:
  US 20090099643A1
• Time in Patent Office: 1,783 Days
• Field of Search: 623/1.12, 623/1.13, 623/1.15, 623/1.2, 606/200, 606/188
• US Class Current: 623/1.11
• CPC Class Codes: A61B 2017/00526 Methods of manufacturing
• CPC Class Codes: A61F 2/0105 Open ended, i.e. legs gathered only at one side
• CPC Class Codes: A61F 2/0108 Both ends closed, i.e. legs gathered at both ends
• CPC Class Codes: A61F 2/011 Instruments for their placement or removal
• CPC Class Codes: A61F 2/04 Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts A61F2/18, A61F2/20 take precedence; devices, other than stent-grafts, providing patency to, or preventing collapsing of, tubular structures of the body other than stent-grafts, e.g. stents A61F2/82; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/88 the wire-like elements formed as helical or spiral coils forming a net-like or mesh-like structure A61F2/90
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/962 having an outer sleeve
• CPC Class Codes: A61F 2002/016 made from wire-like elements
• CPC Class Codes: A61F 2002/018 made from tubes or sheets of material, e.g. by etching or laser-cutting
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2002/077 having means to fill the space between stent-graft and aneurysm wall, e.g. a sleeve
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires
• CPC Class Codes: A61F 2210/0004 bioabsorbable
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2220/0075 : sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2230/0006 : circular
• CPC Class Codes: A61F 2230/001 : Figure-8-shaped, e.g. hourglass-shaped
• CPC Class Codes: A61F 2230/0015 : Kidney-shaped, e.g. bean-shaped
• CPC Class Codes: A61F 2230/0065 : toroidal, e.g. ring-shaped, doughnut-shaped
• CPC Class Codes: A61F 2230/0067 : conical
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2230/0076 : ellipsoidal or ovoid
• CPC Class Codes: A61F 2230/0078 : hyperboloidal
• CPC Class Codes: A61F 2230/008 : paraboloidal
• CPC Class Codes: A61F 2230/0091 : helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section
• CPC Class Codes: A61F 2230/0093 : Umbrella-shaped, e.g. mushroom-shaped
• CPC Class Codes: A61F 2250/0039 : differing in diameter
• CPC Class Codes: D04C 1/06 : Braid or lace serving particular purposes
• CPC Class Codes: D04C 3/48 : Auxiliary devices
• CPC Class Codes: D10B 2509/06 : Vascular grafts; stents

Abstract

Self-expandable, woven intravascular devices for use as stents (both straight and tapered), filters (both temporary and permanent) and occluders for insertion and implantation into a variety of anatomical structures. The devices may be formed from shape memory metals such as nitinol. The devices may also be formed from biodegradable materials. Delivery systems for the devices include two hollow tubes that operate coaxially. A device is secured to the tubes prior to the implantation and delivery of the device by securing one end of the device to the outside of the inner tube and by securing the other end of the device to the outside of the outer tube. The stents may be partially or completely covered by graft materials, but may also be bare. The devices may be formed from a single wire. The devices may be formed by either hand or machine weaving. The devices may be created by bending shape memory wires around tabs projecting from a template, and weaving the ends of the wires to create the body of the device such that the wires cross each other to form a plurality of angles, at least one of the angles being obtuse. The value of the obtuse angle may be increased by axially compressing the body.

Claims

1. A medical stent comprising:

a plurality of geometric cells defining a stent, the stent having first and second opposed open ends; and

a plurality of wire strands plain woven to form a plurality of crossed regions defining said geometric cells;

wherein each wire strand has strand ends and the strand ends are disposed proximate to said second end of said stent, and

wherein each strand end is welded to another strand end.

2. The stent of claim 1, wherein said wire strands are nitinol wire strands.

3. The stent of claim 1, wherein the geometric cells have a diamond shape.

4. The stent of claim 1, wherein each strand has a diameter from about 0.003 inches to about 0.012 inches.

5. The stent of claim 1, wherein each strand has a diameter from about 0.003 inches to about 0.006 inches.

6. The stent of claim 1, wherein each strand has a diameter from about 0.005 inches to about 0.011 inches.

7. The stent of claim 1, wherein each strand has a diameter from about 0.006 inches to about 0.012 inches.

8. The stent of claim 1, wherein each strand has a diameter from about 0.006 inches to about 0.009 inches.

9. The stent of claim 1, wherein each strand has a diameter from about 0.009 inches to about 0.013 inches.

10. The stent of claim 1, wherein each strand has a diameter from about 0.008 inches to about 0.015 inches.

11. The stent of claim 1, wherein each strand has a diameter of about 0.007 inches.

12. The stent of claim 1, wherein each strand has a diameter of about 0.009 inches.

13. The stent of claim 1, wherein each strand has a diameter of about 0.011 inches.

14. The stent of claim 1, wherein the stent is coated with silicone.

15. The stent of claim 1, further comprising a covering.

16. The stent of claim 15, wherein the covering comprises polyurethane.

17. The stent of claim 15, wherein the covering partially covers the stent.

18. The stent of claim 1, wherein each strand has a diameter of about 0.006 inches.

19. The stent of claim 1, wherein the plurality of wire strands comprises 6 to 12 wire strands.

20. The stent of claim 1, wherein the plurality of wire strands comprises at least 6 wire strands.

21. The stent of claim 1, wherein the plurality of wire strands comprises 10 wire strands.

22. The stent of claim 1, wherein the stent has a tubular shape with a substantially uniform diameter.

23. The stent of claim 1, wherein the stent has a generally hourglass shape.

24. The stent of claim 1, wherein the first and second ends are flared.

25. The stent of claim 1, wherein the strand ends are disposed at said second end of said stent.

26. The stent of claim 1, wherein the stent defines a longitudinal axis and wherein the joined welded strand ends are spaced along a plane transverse to the longitudinal axis.

27. The stent of claim 1, wherein the joined welded strand ends are spaced along a circumference of the stent.

28. A medical stent comprising:

a plurality of geometric cells defining a stent, the stent having first and second opposed open ends; and

a plurality of wire strands plain woven to form a plurality of crossed regions defining said geometric cells;

wherein the wire strands are bent to define said first end of said stent and further wherein each wire strand has strand ends and the strand ends are disposed proximate to said second end of said stent, and

wherein each strand end is welded to another strand end.

29. The stent of claim 28, wherein the geometric cells have a diamond shape.

30. The stent of claim 28, wherein said wire strands are nitinol wire strands.

31. The stent of claim 28, wherein the stent defines a longitudinal axis and wherein the welded strand ends are spaced along a plane transverse to the longitudinal axis.

32. The stent of claim 28, wherein the welded strand ends are spaced along a circumference of the stent.

33. The stent of claim 28, wherein each strand has a diameter from about 0.003 inches to about 0.012 inches.

34. The stent of claim 28, wherein each strand has a diameter from about 0.005 inches to about 0.011 inches.

35. The stent of claim 28, wherein each strand has a diameter of about 0.006 inches.

36. The stent of claim 28, wherein each strand has a diameter of about 0.007 inches.

37. The stent of claim 28, wherein the stent is coated with silicone.

38. The stent of claim 28, further comprising a covering.

39. The stent of claim 38, wherein the covering comprises polyurethane.

40. The stent of claim 38, wherein the covering partially covers the stent.

41. The stent of claim 28, wherein the plurality of wire strands comprises 6 to 12 wire strands.

42. The stent of claim 28, wherein the plurality of wire strands comprises at least 6 wire strands.

43. The stent of claim 28, wherein the plurality of wire strands comprises 10 wire strands.

44. The stent of claim 28, wherein the stent has a tubular shape with a substantially uniform diameter.

45. The stent of claim 28, wherein the stent has a generally hourglass shape.

46. The stent of claim 28, wherein the first and second ends are flared.

47. The stent of claim 28, wherein the strand ends are disposed at said second end of said stent.

48. A medical stent comprising:

a plurality of geometric cells defining a stent, the stent having first and second opposed open ends; and

a plurality of wire strands plain woven to form a plurality of crossed regions defining said geometric cells;

wherein the wire strands are bent to define said first end of said stent and further wherein each wire strand has strand ends and the strand ends are helically twisted and disposed proximate to said second end of said stent, and

wherein each strand end is welded to another strand end.

49. The stent of claim 48, wherein the stent defines a longitudinal axis and wherein the welded strand ends are spaced along a plane transverse to the longitudinal axis.

50. The stent of claim 48, wherein the welded strand ends are spaced along a circumference of the stent.

51. The stent of claim 48, wherein said wire strands are nitinol wire strands.

52. The stent of claim 48, wherein the geometric cells have a diamond shape.

53. The stent of claim 48, wherein each strand has a diameter from about 0.003 inches to about 0.012 inches.

54. The stent of claim 48, wherein each strand has a diameter from about 0.005 inches to about 0.011 inches.

55. The stent of claim 48, wherein each strand has a diameter of about 0.006 inches.

56. The stent of claim 48, wherein each strand has a diameter of about 0.007 inches.

57. The stent of claim 48, wherein the stent is coated with silicone.

58. The stent of claim 48, further comprising a covering.

59. The stent of claim 58, wherein the covering comprises polyurethane.

60. The stent of claim 58, wherein the covering partially covers the stent.

61. The stent of claim 48, wherein the plurality of wire strands comprises 6 to 12 wire strands.

62. The stent of claim 48, wherein the plurality of wire strands comprises at least 6 wire strands.

63. The stent of claim 48, wherein the plurality of wire strands comprises 10 wire strands.

64. The stent of claim 48, wherein the stent has a tubular shape with a substantially uniform diameter.

65. The stent of claim 48, wherein the stent has a generally hourglass shape.

66. The stent of claim 48, wherein the first and second ends are flared.

67. The stent of claim 48, wherein the strand ends are disposed at said second end of said stent.

68. A medical stent comprising:

a plurality of geometric cells defining a stent, the stent having first and second opposed open ends; and

a plurality of wire strands woven to form a plurality of crossed regions defining said geometric cells;

wherein the wire strands are bent to define said first end of said stent and wherein each wire strand has strand ends, each strand end disposed closer to said second end of said stent than to said first end of said stent, wherein each strand end is welded to another strand end.

69. The stent of claim 68, wherein said wire strands are nitinol wire strands.

70. The stent of claim 68, wherein the stent defines a longitudinal axis and wherein the welded strand ends are spaced along a plane transverse to the longitudinal axis.

71. The stent of claim 68, wherein the welded strand ends are spaced along a circumference of the stent.

72. The stent of claim 68, wherein the geometric cells have a diamond shape.

73. The stent of claim 68, wherein each strand has a diameter from about 0.003 inches to about 0.012 inches.

74. The stent of claim 68, wherein each strand has a diameter from about 0.005 inches to about 0.011 inches.

75. The stent of claim 68, wherein each strand has a diameter of about 0.006 inches.

76. The stent of claim 68, wherein each strand has a diameter of about 0.007 inches.

77. The stent of claim 68, wherein the stent is coated with silicone.

78. The stent of claim 68, further comprising a covering.

79. The stent of claim 78, wherein the covering comprises polyurethane.

80. The stent of claim 78, wherein the covering partially covers the stent.

81. The stent of claim 68, wherein the plurality of wire strands comprises 6 to 12 wire strands.

82. The stent of claim 68, wherein the plurality of wire strands comprises at least 6 wire strands.

83. The stent of claim 68, wherein the plurality of wire strands comprises 10 wire strands.

84. The stent of claim 68, wherein the stent has a tubular shape with a substantially uniform diameter.

85. The stent of claim 68, wherein the stent has a generally hourglass shape.

86. The stent of claim 68, wherein the first and second ends are flared.