Stent with variable wall thickness

• US 6,325,825 B1
• Filed: 04/08/1999
• Issued: 12/04/2001
• Est. Priority Date: 04/08/1999
• Status: Expired due to Term

• Current Assignee: Cardinal Health Switzerland 515 GmbH (Cardinal Health, Inc.)
• Original Assignee: Cordis Corporation (Cardinal Health, Inc.)
• Inventors: Kula, John S., Gomez, Andreina, Umbach, James E.
• Primary Examiner(s): O'Connor, Cary E.
• Application Number:
  US09/288,406
• Time in Patent Office: 971 Days
• Field of Search: 623/1.2, 623/1.15, 623/1.11, 623/1--, 623/1.27, 623/1.17, 606/198, 606/194-195, 606/190, 606/200
• US Class Current: 623/1.3
• 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 2002/91541 Adjacent bands are arranged out of phase
• CPC Class Codes: A61F 2002/9155 Adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2250/0018 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2250/0029 differing in bending or flexure capacity
• CPC Class Codes: A61F 2250/0036 differing in thickness

Abstract

A stent is made flexible along its length. The stent initially starts as a metal sheet. It is rolled in its central region to a specified wall thickness. Thereafter, the stent is photochemically etched to produce the desired cell pattern of the design of the stent. Then, the stent is folded and the metal is joined to give rise to a stent with multiple wall thickness. For instance, larger wall thicknesses at the end of the stent versus smaller wall thicknesses at its center. Various other possible manufacturing methods are useful with respect to this stent.

Claims

1. A stent comprising:

a generally tubular device with a diameter and a length having a pattern of interconnected struts, said struts being cut from said tubular device, and said struts having a cross-sectional width and thickness; and

said strut thickness being variable along the length of said stent; and

wherein at least one of said struts with such a variable thickness comprises said strut having a relatively greater thickness, a relatively smaller thickness and a relatively intermediate thickness.

2. The stent of claim 1 used in combination with a balloon catheter.

3. The stent of claim 1 wherein said stent is self-expanding.

4. The stent as in claim 1 wherein said variable strut thickness is varied along the length of the strut so that said strut is thicker at its ends than in its middle.

5. The stent of claim 1 wherein said struts are configured so that there are portions of relative thickness and relative thinness along the length of the stent, and said portions of relative thickness are interspersed between said portions of relative thinness.

6. The stent of claim 1 wherein the stent has a portion of relative thickness at one of said ends, and a portion of relative thinness at a second of said ends.

7. A stent comprising:

a balloon expandable mechanism formed from a series of interconnected struts, said struts having a cross-sectional width and thickness; and

said strut thickness being variable along the length of said strut; and

wherein at least one of said struts with such a variable thickness comprises said strut having a relatively greater thickness, a relatively smaller thickness and a relatively intermediate thickness.

8. The stent as in claim 7 wherein said variable strut thickness is varied along the length of the strut so that said strut is thicker at its ends than in its middle.

9. The stent of claim 7 wherein said struts are configured so that there are portions of relative thickness and relative thinness along the length of the stent, and said portions of relative thickness are interspersed between said portions of relative thinness.

10. The stent of claim 7 wherein the stent has a portion of relative thickness at one of said ends, and a portion of relative thinness at a second of said ends.

11. A stent comprising:

a generally tubular device having a diameter and a length and a pattern of interconnected cells formed from a series of struts, said struts being cut into said tubular device and

said struts having a cross-sectional width and thickness; and

said strut thickness being variable along the length of said stent; and

wherein at least one of said struts with such a variable thickness comprises said strut having a relatively greater thickness, a relatively smaller thickness and a relatively intermediate thickness.

12. The stent as in claim 11 wherein said variable strut thickness is varied along the length of the strut so that said strut is thicker at its ends than in its middle.

13. The stent of claim 11 wherein said struts are configured so that there are portions of relative thickness and relative thinness along the length of the stent, and said portions of relative thickness are interspersed between said portions of relative thinness.

14. The stent of claim 11 wherein the stent has a portion of relative thickness at one of said ends, and a portion of relative thinness at a second of said ends.