Stent with variable wall thickness

• US 7,070,617 B2
• Filed: 07/01/2004
• Issued: 07/04/2006
• Est. Priority Date: 04/08/1999
• Status: Expired due to Term

• Current Assignee: Cordis Corporation (Cardinal Health, Inc.)
• Original Assignee: Cordis Corporation (Cardinal Health, Inc.)
• Inventors: Kula, John S., Gomez, Andreina, Umbach, James E.
• Primary Examiner(s): WEHNER, CARY ELLEN
• Application Number:
  US10/883,217
• Publication Number:
  US 20040236405A1
• Time in Patent Office: 733 Days
• Field of Search: 623/1.2, 623/1.15, 623/1.11, 623/1.3, 623/1.31, 623/1.27, 623/1.17, 606/198, 606/194, 606/195, 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 formed in the shape of a cylinder, the stent having a plurality of struts arranged in a circumferential fashion around said cylinder, said cylinder having a generally longitudinal axis, a radial dimension extending from said longitudinal axis, and a circumferential dimension extending around said axis, and said struts interconnected with one another;

said struts having a length, and said stent capable of being expanded from a first diameter to a second expanded diameter;

said struts having a cross-section comprising a width in said circumferential dimension and a thickness in said radial dimension;

and said strut thicknesses variable with a non-uniform texture along their lengths; and

wherein the stent has two ends with a portion of relative thickness at one of said ends, and a portion of relative thinness at a second of said end.

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

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

4. A stent of claim 1 wherein said stent has struts with a variable thickness and the said 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 stent has struts and the 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.