Apparatus and method for decreasing stent gap size

• US 6,997,944 B2
• Filed: 08/13/2001
• Issued: 02/14/2006
• Est. Priority Date: 08/13/2001
• Status: Expired due to Fees

• Current Assignee: Advanced Cardiovascular Systems Incorporated
• Original Assignee: Advanced Cardiovascular Systems Incorporated
• Inventors: Harrison, William James, Denison, Andy E.
• Primary Examiner(s): THALER, MICHAEL H
• Application Number:
  US09/928,851
• Publication Number:
  US 20030033003A1
• Time in Patent Office: 1,646 Days
• Field of Search: 623/1.15, 623/1.16, 623/1.17, 623/1.18
• US Class Current: 623/1.15
• 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 2002/91516 the meander having a change in frequency along the band
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2002/91583 by a bridge, whereby at least one of its ends is connected along the length of a strut between two consecutive apices within a band
• CPC Class Codes: A61F 2230/0054 V-shaped

Abstract

An expandable intraluminal stent having a strut pattern made from a plurality of triangular cells is disclosed. Each triangular cell is formed from at least two V struts of different magnitudes aligned in phase and joined at opposite ends forming two opposed vertices of the triangle. A series of triangular cells are joined at the vertices to form a ring. The series of triangular cells may be arranged to form peaks in the ring, peaks and valleys in the ring, or a combination thereof. A plurality of the rings are aligned coaxially and joined by connecting elements to form a tubular shape. Use of the double V strut formation in the rings increases vessel wall coverage, reduces gap sizes, and does not impair the compressability of the stent for a small profile for delivery.

Claims

1. An expandable intraluminal stent, comprising:

a plurality of rings aligned along a common axis to form a tubular shape;

wherein each ring includes a plurality of cells, each cell being defined by at least two V struts of different amplitudes that are aligned in phase and nested within one another, wherein each of said V struts is defined by two arm segments converging at one end to define a first vertex that is otherwise unattached to any other stent structure and diverging at the opposite end such that each defines a second vertex with an arm segment of a V strut with which it is nested, and wherein each second vertex is attached to a second vertex of an adjacent cell by a link; and

a connecting element extending between a link between adjacent cells in one ring with a link between adjacent cells of an adjacent ring.

2. The expandable intraluminal stent of claim 1, wherein the arm segments are curved.

3. The expandable intraluminal stent of claim 1, wherein the connecting element is oriented generally parallel to the common axis.

4. The expandable intraluminal stent of claim 1, wherein the stent includes a plurality of connecting elements aligned in phase between rings.

5. The expandable intraluminal stent of claim 1, wherein the stent includes a plurality of connecting elements aligned out of phase between rings.

6. The expandable intraluminal stent of claim 1, wherein at least one of the second vertices includes increased mass.

7. The expandable intraluminal stent of claim 1, wherein at least one of the first vertices includes increased mass.

8. The expandable intraluminal stent of claim 1, wherein the links are curved.

9. The expandable intraluminal stent of claim 1, wherein the cells are triangular upon stent expansion.

10. An expandable intraluminal stent, comprising:

a plurality of rings aligned along a common axis to form a tubular shape;

wherein each ring includes a plurality of cells;

wherein each cell is formed from at least two nested V struts of differing amplitudes converging from common points to define peaks, wherein said common points of adjacent cells are linked by valleys, and wherein said peaks of each cell are free to shift relative to one another during expansion of said stent; and

a connecting element extending between valleys of adjacent rings.

11. The expandable intraluminal stent of claim 10, wherein the stent includes a superelastic metallic alloy and is self-expanding.

12. The expandable intraluminal stent of claim 10, wherein the stent includes a low elasticity metal and the stent is balloon expandable.

13. The expandable intraluminal stent of claim 10, wherein said valleys are curved.

14. The expandable intraluminal stent of claim 10, wherein a plurality of connecting elements extend between valleys of adjacent rings and adjacent connecting elements are separated by at least two cells.

15. The expandable intraluminal stent of claim 10, wherein the V struts have curved segments.

16. The expandable intraluminal stent of claim 10, wherein the cells are triangular upon stent expansion.