Stent pattern with figure-eights

• US 6,749,629 B1
• Filed: 06/27/2001
• Issued: 06/15/2004
• Est. Priority Date: 06/27/2001
• Status: Active Grant

• Current Assignee: Advanced Cardiovascular Systems Incorporated
• Original Assignee: Advanced Cardiovascular Systems Incorporated
• Inventors: Ainsworth, Stephen D., Cheng, E Tina, Hong, James
• Primary Examiner(s): McDermott, Corrine
• Assistant Examiner(s): MATTHEWS, WILLIAM H
• Application Number:
  US09/892,889
• Time in Patent Office: 1,084 Days
• Field of Search: 623/1.15, 623/1.16, 623/1.17, 623/1.2, 606/198
• 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 2002/91508 the meander having a difference in amplitude along the band
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• 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 2002/91583 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 2230/0008 elliptical or oval
• CPC Class Codes: A61F 2250/0018 differing in elasticity, stiffness or compressibility

Abstract

The invention is directed to an expandable stent for implanting in a body lumen, such as a coronary artery, peripheral artery, or other body lumen. The invention provides for an intravascular stent having a plurality of cylindrical rings connected by links. The rings have peaks and valleys from which extend straight and nonlinear bar arms, forming a figure-eight. The links connecting the cylindrical rings may be straight, undulating, or include bounded apertures for additional flexibility.

Claims

1. An intravascular stent for use in a body lumen, comprising:

a plurality of cylindrical rings aligned along a longitudinal axis, each ring having

a first, delivery diameter,

a second, implanted diameter,

proximal and distal ends defining a generally cylindrical wall extending circumferentially between the proximal and distal ends,

a plurality of figure-eights comprising open loops, the figure-eights being configured such that an open loop includes first and second loop ends diagonally opposed from first and second oppositely disposed loop ends of an oppositely disposed loop, the first loop end being diagonally connected by a straight bar to the second oppositely disposed loop end and the second loop end pointing toward the first oppositely disposed loop end;

non-linear bar arms and straight bar arms, wherein the straight bar arms have a first arm axis and the nonlinear bar arms have a second arm axis, and wherein the non-linear bar arms include the open loops;

at least one link having a first end and a second end, wherein the first link end is connected to an open loop of one ring and the second link end is connected to an open loop of an adjacent ring; and

wherein the stent has a longitudinal axis parallel to the at least one link.

2. The stent of claim 1, wherein the first and second arm axes are parallel.

3. The stent of claim 1, wherein the first and second arm axes are at acute angles to each other.

4. The stent of claim 1, wherein the straight bar arms are adjacent to the non-linear bar arms.

5. The stent of claim 1, wherein the connecting links include a bounded aperture disposed between the cylindrical rings.

6. The stent of claim 5, wherein the aperture is an oval.

7. The stent of claim 5, wherein the aperture is generally rectangular.

8. The stent of claim 5, wherein the aperture is generally in the shaper of a dog bone.

9. An expandable endovascular prosthesis comprising:

a plurality of adjacent, expandable undulating rings, each ring comprising a plurality of figure eight shaped portions;

each figure-eight shaped portion being formed by a straight intermediate bar arm connected to a portion of two non-linear bar arms to define a plurality of crests; and

at least one link connecting each ring to an adjacent ring, the link being connected to the crest of one ring and to an intermediate portion of a bar arm of an adjacent ring.

10. The prosthesis of claim 9, wherein the two non-linear bar arms are sinusoidally shaped.

11. The prosthesis of claim 9, wherein the intermediate portion of the bar arm is the middle of the bar arm.

12. The prosthesis of claim 11, wherein the bar arm with the intermediate portion is a non linear bar arm.

13. The prosthesis of claim 12, wherein the prosthesis comprises repeating patterns of two adjacent rings.