Stent having an expandable web structure

• US 20070135891A1
• Filed: 11/16/2006
• Published: 06/14/2007
• Est. Priority Date: 09/05/1998
• Status: Active Grant

• Current Assignee: Abbott International Enterprises Ltd. (Abbott Laboratories)
• Original Assignee: Abbott Laboratories Vascular Enterprises Limited (Abbott Laboratories)
• Inventors: Schneider, Ralph
• Granted Patent: US 7,887,578 B2
• Time in Patent Office: Days
• US Class Current: 623/1.150
• 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 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61F 2230/0054 V-shaped

Abstract

A stent comprises a tubular flexible body composed of a web structure that is expandable from a contracted delivery configuration to a deployed configuration and that comprises neighboring web patterns of alternating concavities extending circumferentially and adjoined by X-shaped transition sections. The web pattern may comprise either arcuate struts interconnected by bends, or a plurality of substantially straight sections with the transition sections formed by the junctions between pairs of adjacent bends of opposite curvatures.

Claims

1. A stent comprising:

a tubular body having a proximal, a distal end, and a lumen extending therebetween,

the tubular body having a wall defining a web structure configured for expansion from a collapsed delivery configuration to an expanded deployed configuration,

the web structure comprising a plurality of neighboring web patterns of alternating concavities that extend circumferentially around the wall,

each of the web patterns including a plurality of arcuate struts interconnected by bends, and

neighboring web patterns being connected by two or more X-shaped transition sections, each X-shaped transition section being formed by a junction between a pair of bends of opposite curvatures.

2. The stent of claim 1, wherein the X-shaped transition sections are disposed at an angle relative to a longitudinal axis of the stent.

3. The stent of claim 2, wherein each X-shaped transition section is formed by a junction between the upward end of a bend interconnecting two downward concave struts with a neighboring downward end of a bend interconnecting two upward concave struts.

4. The stent of claim 1, wherein the transition sections connect one out of every three pairs of adjacent bends around the circumference of the neighboring web patterns.

5. The stent of claim 4, wherein the transition sections extending from one end of each web pattern are staggered relative to the transition sections extending from an opposite end of the web pattern.

6. The stent of claim 1, wherein the stent is balloon expandable.

7. The stent of claim 6, wherein the stent is manufactured from a deformable material.

8. The stent of claim 1, wherein the stent is self-expanding.

9. The stent of claim 8, wherein the stent is manufactured from a shape memory material.

10. The stent of claim 1, wherein the stent is manufactured from a polymeric material, a metallic material, or a metal alloy.

11. The stent of claim 10, wherein the polymeric material is a poly-L-lactid material.

12. The stent of claim 10, wherein the metallic material is stainless steel, titanium, platinum, tantalum, or a combination thereof.

13. The stent of claim 10, wherein the metal alloy is a titanium alloy, a platinum alloy, a nickel-titanium alloy, a platinum-nickel-titanium alloy, a tantalum alloy, a cobalt-chromium alloy, or a combination thereof.

14. The stent of claim 1, wherein the stent is radiopaque.

15. The stent of claim 1, wherein the web structure comprises a therapeutic coating.

16. The stent of claim 15, wherein the therapeutic coating is selected from the group consisting of therapeutic agents that retard thrombus formation, therapeutic agents that retard restenosis, and therapeutic agents for systemic or local delivery via the blood system.

17. The stent of claim 1, wherein the stent is manufactured as a single layer structure.

18. The stent of claim 1, wherein the stent is manufactured as a multi-layer structure.

27. The stent of claim 14, wherein the stent is self-expanding.

28. The stent of claim 27, wherein the stent is manufactured from a shape memory material.

19. A stent comprising:

a tubular body having a proximal end, a distal end, and a lumen extending therebetween,

the tubular body having a wall defining a web structure configured for expansion from a collapsed delivery configuration to an expanded deployed configuration,

the web structure comprising a plurality of neighboring web patterns of alternating concavities that extend circumferentially around the wall,

each of the web patterns including a plurality of arcuate struts interconnected by bends,

each of the arcuate struts comprising at least one substantially straight section,

the neighboring web patterns being connected by two or more X-shaped transition sections, and

each X-shaped transition sections being formed by a junction between a pair of adjacent bends of opposite curvatures.

20. The stent of claim 19, wherein each of the arcuate struts comprises three substantially straight sections.

21. The stent of claim 19, wherein each X-shaped transition section is disposed at an angle relative to a longitudinal axis of the stent.

22. The stent of claim 21, wherein each X-shaped transition section is formed by a junction between an upward end of a bend interconnecting two downward concave struts with a neighboring downward end of a bend interconnecting two upward concave struts.

23. The stent of claim 19, wherein the X-transition sections connect one out of every three pairs of adjacent bends around the circumference of the web pattern.

24. The stent of claim 23, wherein the transition sections extending from one end of each web pattern are staggered relative to the transition sections extending from an opposite end of the web pattern.

25. The stent of claim 19, wherein the stent is balloon expandable.

26. The stent of claim 25, wherein the stent is manufactured from a deformable material.

29. The stent of claim 19, wherein the stent is manufactured from a polymeric material, a metallic material, or a metal alloy.

30. The stent of claim 29, wherein the polymeric material is a poly-L-lactid material.

31. The stent of claim 29, wherein the metallic material is stainless steel, titanium, platinum, tantalum, or a combination thereof.

32. The stent of claim 29, wherein the metal alloy is a titanium alloy, a platinum alloy, a nickel-titanium alloy, a platinum-nickel-titanium alloy, a tantalum alloy, a cobalt-chromium alloy, or a combination thereof.

33. The stent of claim 19, wherein the stent is radiopaque.

34. The stent of claim 19, wherein the web structure comprises a therapeutic coating.

35. The stent of claim 34, wherein the therapeutic coating is selected from the group consisting of therapeutic agents that retard thrombus formation, therapeutic agents that retard restenosis, and therapeutic agents for systemic or local delivery via the blood system.

36. The stent of claim 19, wherein the stent is manufactured as a single layer structure.

37. The stent of claim 19, wherein the stent is manufactured as a multi-layer structure.