Multi-section stent

• US 6,258,117 B1
• Filed: 04/15/1999
• Issued: 07/10/2001
• Est. Priority Date: 04/15/1999
• Status: Expired due to Term

• Current Assignee: Mayo Foundation For Medical Education And Research (Mayo Clinic)
• Original Assignee: Mayo Foundation For Medical Education And Research (Mayo Clinic)
• Inventors: Berry, David, Camrud, Allen R., Schwartz, Robert S., Holmes, David R. Jr., Argo, Timothy D.
• Primary Examiner(s): Willse, David H.
• Assistant Examiner(s): GHERBI, SUZETTE JAIME J
• Application Number:
  US09/292,558
• Time in Patent Office: 817 Days
• Field of Search: 623/1.15, 623/1.16, 623/1.28, 623/1.29, 623/1.38, 623/23.7
• US Class Current: 623/1.16
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• 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 2/89 the wire-like elements comprising two or more adjacent rings flexibly connected by separate members
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2002/826 more than one stent being applied sequentially
• CPC Class Codes: A61F 2002/828 Means for connecting a plurality of stents allowing flexibility of the whole structure
• CPC Class Codes: A61F 2210/0004 bioabsorbable
• CPC Class Codes: A61F 2250/0031 made from both resorbable and non-resorbable prosthetic parts, e.g. adjacent parts
• CPC Class Codes: A61F 2250/0039 differing in diameter
• CPC Class Codes: A61F 2250/0051 differing in tissue ingrowth capacity, e.g. made from both ingrowth-promoting and ingrowth-preventing parts
• CPC Class Codes: A61F 2250/0067 Means for introducing or releasing pharmaceutical products into the body
• CPC Class Codes: A61F 2250/0071 breakable or frangible
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers

Abstract

A multi-section stent includes a connecting structure that allows the stent sections to move and flex relative to one another. For deployment and positioning, the connecting structure connects the multiple stent sections and holds the stent sections substantially stationary relative to one another. Following deployment, the connecting structure allows the multiple stent sections to move relative to one another. Movable stent sections enable flexure of the stent upon deployment within a body lumen. This flexing structure allows better conformance of the stent to the shape of the body lumen, and exerts less overall pressure against the lumen wall, reducing the potential for trauma. Upon deployment, the multiple stent sections may be completely detached from one another. Alternatively, the stent sections may remain partially connected in a manner that allows substantial independent movement. The connecting structure can be manufactured to separate upon deployment, for example, by breaking or degrading within the body lumen in which the stent is positioned.

Claims

1. A stent comprising a first stent section;

a second stent section;

and a connecting structure that connects the first and second stent sections, the connecting structure allowing the first and second stent sections to move relative to one another upon deployment of the stent within a body lumen, wherein the connecting structure is partially separable following deployment of the stent within the body lumen.

2. The stent of claim 1, wherein the connecting structure is partially breakable following deployment of the stent within the body lumen.

3. The stent of claim 2, wherein the connecting structure includes a thinned portion that promotes partial breakage of the connecting structure, thereby allowing movement of the stent sections relative to one another.

4. The stent of claim 2, wherein the connecting structure includes a perforated portion that promotes breakage of the connecting member, thereby allowing movement of the stent sections relative to one another.

5. The stent of claim 1, wherein the first and second stent sections and the connecting structure form a substantially continuous stent body, and the stent body includes a breakable portion disposed between the first and second stent sections, the breakable portion being constructed to at least partially break under intraluminal forces to promote the separation of the first and second stent sections, thereby at least partially disconnecting the first and second stent sections from the stent body.

6. The stent of claim 5, wherein the breakable portion of the stent body includes a weakened portion of the stent body.

7. The stent of claim 5, wherein the breakable portion of the stent body includes a thinned portion.

8. The stent of claim 5, wherein the breakable portion of the stent body includes a perforated portion.

9. The stent of claim 5, wherein the breakable portion of the stent body includes a scribed portion.

10. The stent of claim 5, wherein the breakable portion of the stent body includes a machined portion.

11. The stent of claim 5, wherein the breakable portion of the stent body includes an etched portion.

12. The stent of claim 5, wherein the breakable portion includes a molded groove forming a thinned portion.

13. The stent of claim 1, further comprising a third stent section, and a fourth stent section, wherein the connecting structure connects the third stent section to the second stent section and the fourth stent section, the connecting structure being partially breakable to allow the first, second, third, and fourth stent sections to move relative to one another.

14. A stent comprising:

a first stent section;

a second stent section; and

a connecting structure that connects the first and second stent sections, the connecting structure allowing the first and second stent sections to move relative to one another following deployment of the stent within a body lumen,

wherein the connecting structure includes a perforated portion that promotes breakage of the connecting structure, thereby allowing movement of the stent sections relative to one another.

15. A stent comprising:

a first stent section;

a second stent section; and

a connecting structure that connects the first and second stent sections, the connecting structure allowing the first and second stent sections to move relative to one another following deployment of the stent within a body lumen, wherein the connecting structure is at least partially separable following deployment of the stent within the body lumen, and

wherein the connecting structure includes a material that degrades over time upon deployment of the stent within the body lumen to promote the at least partial separation, the connecting structure at least partially disconnecting the first and second stent sections upon degradation of the material.

16. The stent of claim 15, wherein the degradable material is selected from the group consisting of body-soluble sugar, collagen, fibrin, polyurethane, polyunhydride, and polyethyloxide.

17. The stent of claim 16, wherein the degradable material includes a therapeutic substance that is released into the body lumen during degradation of the material.

18. The stent of claim 17, wherein the therapeutic substance includes heparin.

19. A stent comprising:

a first stent section;

a second stent section; and

a connecting structure that connects the first and second stent sections, the connecting structure allowing the first and second stent sections to move relative to one another following deployment of the stent within a body lumen, wherein the connecting structure is at least partially separable following deployment of the stent within the body lumen, and

wherein the first and second stent sections and the connecting structure form a substantially continuous stent body, and the stent body includes a breakable portion disposed between the first and second stent sections, the breakable portion being constructed to break under intraluminal forces to promote the separation, thereby at least partially disconnecting the first and second stent sections from the stent body, and wherein the breakable portion of the stent body includes a scribed portion.

20. A stent comprising:

a first stent section;

a second stent section; and

a connecting structure that connects the first and second stent sections, the connecting structure allowing the first and second stent sections to move relative to one another following deployment of the stent within a body lumen, wherein the connecting structure is at least partially separable following deployment of the stent within the body lumen, and

wherein the first and second stent sections and the connecting structure form a substantially continuous stent body, and the stent body includes a breakable portion disposed between the first and second stent sections, the breakable portion being constructed to break under intraluminal forces to promote the separation, thereby at least partially disconnecting the first and second stent sections from the stent body, and wherein the breakable portion of the stent body includes a machined portion.

21. A stent comprising:

a first stent section;

a second stent section; and

a connecting structure that connects the first and second stent sections, the connecting structure allowing the first and second stent sections to move relative to one another following deployment of the stent within a body lumen, wherein the connecting structure is at least partially separable following deployment of the stent within the body lumen, and

wherein the first and second stent sections and the connecting structure form a substantially continuous stent body, and the stent body includes a breakable portion disposed between the first and second stent sections, the breakable portion being constructed to break under intraluminal forces to promote the separation, thereby at least partially disconnecting the first and second stent sections from the stent body, and wherein the breakable portion of the stent body includes an etched portion.

22. A stent comprising:

a first stent section;

a second stent section; and

a connecting structure that connects the first and second stent sections, the connecting structure allowing the first and second stent sections to move relative to one another following deployment of the stent within a body lumen, wherein the connecting structure is at least partially separable following deployment of the stent within the body lumen, and

wherein the first and second stent sections and the connecting structure form a substantially continuous stent body, and the stent body includes a breakable portion disposed between the first and second stent sections, the breakable portion being constructed to break under intraluminal forces to promote the separation, thereby at least partially disconnecting the first and second stent sections from the stent body and wherein the breakable portion includes a molded groove forming a thinned portion of the stent body.

23. A stent comprising:

a plurality of stent sections; and

a connecting structure that connects the stent sections, the connecting structure being at least partially degradable following deployment of the stent within the body lumen to thereby disconnect the stent sections from one another.

24. The stent of claim 23, wherein the stent sections and the connecting structure form a substantially continuous stent body, and the stent body includes one or more degradable portions disposed between the stent sections, each of the degradable portions being constructed to degrade upon deployment of the stent within the body lumen.

25. The stent of claim 23, wherein the connecting structure includes a degradable material selected from the group consisting of body-soluble sugar, collagen, fibrin, polyurethane, polyunhydride, and polyethyloxide.

26. The stent of claim 23, wherein the connecting structure includes a degradable material carrying a therapeutic substance that is released into the body lumen during degradation of the material.

27. The stent of claim 26, wherein the therapeutic substance includes heparin.

28. The stent of claim 23, wherein the connecting structure includes a degradable material selected to dissolve in the presence of fluids within the body lumen.

29. The stent of claim 23, wherein the connecting structure includes a degradable material selected to dissolve in response to administration of a solvent prior to deployment of the stent.

30. The stent of claim 23, wherein the connecting structure includes a degradable material selected to dissolve in response to administration of a substance to the patient.

31. A stent comprising:

a first stent section;

a second stent section; and

a connecting structure that connects the first and second stent sections, the connecting structure having a breakable portion configured to break in response to force applied by a deployment device during deployment of the stent, thereby disconnecting the first and second stent sections from one another.

32. The stent of claim 31, wherein the breakable portion includes a weakened portion of the stent.

33. The stent of claim 31, wherein the breakable portion includes a thinned portion of the stent.

34. The stent of claim 31, wherein the breakable portion includes a perforated portion of the stent.

35. The stent of claim 31, wherein the breakable portion includes a scribed portion of the stent.

36. The stent of claim 31, wherein the breakable portion includes a machined portion of the stent.

37. The stent of claim 31, wherein the breakable portion includes an etched portion of the stent.

38. The stent of claim 31, wherein the breakable portion includes a molded groove forming a thinned portion of the stent.