Conformable vascular stent

• US 20040054400A1
• Filed: 04/10/2003
• Published: 03/18/2004
• Est. Priority Date: 11/12/1999
• Status: Abandoned Application

• Current Assignee: Endovascular Devices Incorporated
• Original Assignee: Endovascular Devices Incorporated
• Inventors: Granada, Vuan Fernando
• Application Number:
  US10/410,950
• Publication Number:
  US 20040054400A1
• Time in Patent Office: Days
• US Class Current: 623/1.16
• 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 2002/91525 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 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0054 V-shaped

Abstract

A vascular conformable stent for implantation within a body lumen of a mammalian patient. The stent comprises a flexible tubular body having a first end and a second end. The tubular body is formed of a plurality of axially adjacent circumferential bands arranged axially therealong, a first of the bands being comprised of a zig-zag strand having a first edge and a second edge. The first edge is comprised of a cell end and a gap in an alternating sequence around the circumferential band, the second edge comprised of a gap and a cell end in an alternating sequence around the circumferential band. A second of the circumferential bands are comprised of a zig-zag strand having a first edge and a second edge, the first edge comprised of a cell end and a gap in an alternating sequence around the circumferential band, the second edge comprised of a gap and a cell end in an alternating sequence around the circumferential band. The second of the circumferential bands is axially adjacent to and is a mirror image of the first circumferential band.

Claims

1. A vascular conformable stent for implantation within a body lumen of a mammalian patient, comprising:

a flexible tubular body having a first end and a second end, said tubular body formed of a plurality of axially adjacent circumferential bands arranged axially therealong, a first of said bands comprised of a zig-zag strand having a first edge and a second edge, said first edge comprised of a cell end and a gap in an alternating sequence around said circumferential band, said second edge comprised of a gap and a cell end in an alternating sequence around said circumferential band;

a second of said circumferential bands comprised of a zigzag strand having a first edge and a second edge, said first edge comprised of a cell end and a gap in an alternating sequence around said circumferential band, said second edge comprised of a gap and a cell end in an alternating sequence around said circumferential band;

wherein said second of said circumferential bands is axially adjacent to and is a mirror image of said first circumferential band.

2. The vascular conformable stent as recited in claim 1, wherein each of said circumferential bands are flexibly connected to an adjacent circumferential band by an “

S”

shaped connector.

3. The vascular conformable stent as recited in claim 2, wherein said “

S”

shaped connector is radially thinner than said strands comprised of said zig-zag strands.

4. The vascular conformable stent as recited in claim 2, wherein said “

S”

shaped connector is narrower than said strands comprised of said zig-zag strands.

5. The vascular conformable stent as recited in claim 3, wherein said “

S”

shaped connector is at least about 50% narrower than said strands comprised of said zig-zag strands

6. The vascular conformable stent as recited in claim 1, wherein said cell end comprises an arc of said strand extending through about 270 degrees.

7. The vascular conformable stent as recited in claim 1, wherein said gap comprises a circumferentially disposed open space between circumferentially adjacent cell ends.

8. The vascular conformable stent as recited in claim 6, wherein said cell end has a pair of straight legs thereattached, at a pinched cell end neck thereon.

9. The vascular conformable stent as recited in claim 8, wherein a pair of axially aligned cell ends define a unit cell of said stent between them, each of said unit cells being of generally diamond shape having side edges generally defined by said straight legs extending from each of said cell end.

10. The vascular conformable stent as recited in claim 9, wherein each of said straight legs are arranged at an acute angle with respect to the longitudinal axis of said stent.

11. The vascular conformable stent as recited in claim 1, wherein each of said cell ends on said first circumferential band on said first end of said tubular body and each of said cell ends on said second edge of said circumferential band on said second end of said stent are free of said “

S”

shaped connector.

12. The vascular conformable stent as recited in claim 10, wherein said straight legs of said unit cells define a pattern of Xs in axial alignment along the outer surface of said tubular body of said stent, from said first end to said second end.

13. A method of deploying and conforming a vascular stent to any irregularities of a vascular lumen in a mammalian patient, comprising the steps of:

arranging an array of unit cells along a foraminous tubular member, said unit cells being in axial alignment from a first end of said stent to a second end of said stent, said unit cells being attached in axial alignment to one another by an “

S”

shaped connector, said “

S”

shaped connector being radially thinner than said unit cells;

deploying said vascular stent in a convoluted vessel;

bending said vascular stent about said “

S”

shaped connector by deforming said “

S”

shaped connectors in a torsional direction, and in a radial direction while expanding said unit cells radially and circumferentially against said body lumen, to open said body lumen for facilitating the passage of a body fluid therethrough.

14. The method as recited in claim 13, including:

forming said unit cells by a pair of opposed cell ends in axial alignment with one another, and wherein each of said cell ends are in axial alignment with the longitudinal axis of said stent.

15. The method as recited in claim 14, wherein each of said cell end comprises a strand of material of arranged in a generally circular configuration extending through an arc of about 270 degrees.

16. The method as recited in claim 15, wherein an annular array of unit cells is comprised of a pair of circumferential bands arranged in axial alignment with one another, each said circumferential bands being connected to an axially adjacent circumferential band by said “

S”

connector between said unit cells.

17. The method as recited in claim 16, wherein said unit cells deform in deployment by a twisting and elongation of said “

S”

shaped connectors and by a spreading open of said cell ends.

18. The method as recited in claim 17, wherein said S shaped connectors are radially thinner and about 50% narrower than said strands of material comprising said end cells to facilitate longitudinal, torsional and rotational adjustment and conformance of said vascular stent.