Bifurcation stent and method of positioning in a body lumen

• US 9,101,501 B2
• Filed: 03/30/2010
• Issued: 08/11/2015
• Est. Priority Date: 06/06/1996
• Status: Expired due to Fees

• Current Assignee: Biosensors International Group, Ltd.
• Original Assignee: Biosensors International Group, Ltd.
• Inventors: Laborde, Jean-Claude, Elicker, Robert John, Trauthen, Brett, Seguin, Jacques
• Primary Examiner(s): Sweet, Thomas J
• Assistant Examiner(s): PRESTON, REBECCA STRASZHEIM
• Application Number:
  US12/750,379
• Publication Number:
  US 20100256744A1
• Time in Patent Office: 1,960 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: A61F 2/856 Single tubular stent with a side portal passage
• CPC Class Codes: A61F 2/89 the wire-like elements comprising two or more adjacent rings flexibly connected by separate members
• 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 2/954 for placing stents or stent-grafts in a bifurcation
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/065 Y-shaped blood vessels
• CPC Class Codes: A61F 2002/067 modular
• CPC Class Codes: A61F 2002/825 having longitudinal struts
• 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 2002/9583 Means for holding the stent on the balloon, e.g. using protrusions, adhesives or an outer sleeve
• CPC Class Codes: A61F 2230/0008 elliptical or oval
• CPC Class Codes: A61F 2230/0039 H-shaped
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2250/0032 differing in radiographic density
• CPC Class Codes: A61F 2250/0039 differing in diameter
• CPC Class Codes: A61F 2250/0096 Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers

Abstract

Disclosed is a stent that is useful for treating a vascular bifurcation, the stent having a plurality of segments extending coaxially end to end along a longitudinal axis of the stent from a first end to a second end of the stent, each segment having a plurality of struts extending in a zig-zag pattern around the circumference of the stent, wherein the stent is expandable from reduced diameter to an expanded diameter, the second end of the stent having a larger diameter than the first end when expanded; and an eyelet integrally formed with the segment positioned adjacent the second end, and configured to receive a radiopaque marker therein. The stent provides an improvement over prior stents for treating a vascular bifurcation by allowing the stent to be deployed in the widened transitional zone of a bifurcation such that the second end of the stent is accurately positioned at the carina.

Claims

1. A stent for treating a vascular bifurcation, comprising:

a first proximal end, a second distal end and a longitudinal axis therebetween;

a plurality of segments extending coaxially end to end along the longitudinal axis, each segment consisting of a single ring which forms a circumference of the stent, wherein each single ring comprises a plurality of struts extending in an end to end manner creating a zig zag pattern in which each strut extends from a proximal end of said each single ring to a distal end of said each single ring,

wherein the stent is expandable from a reduced diameter to an expanded diameter and configured to provide support to the vascular bifurcation when expanded, the second distal end having a larger diameter than the first proximal end when expanded;

wherein the plurality of segments consists of four segments and adjacent segments of said four segments are connected to each other by only straight links; and

wherein one of the single rings is positioned adjacent the second distal end and comprises three and no more than three eyelets integrally formed on a distal end of said single ring, and one of the single rings is positioned adjacent the first proximal end and comprises one and no more than one eyelet integrally formed on a proximal end of said single ring, wherein each eyelet comprises an opening configured to receive a radiopaque marker therein, and the opening is oval in shape and has a circumferential dimension greater than an axial dimension.

2. The stent of claim 1, further comprising a radiopaque marker.

3. The stent of claim 2, wherein the radiopaque marker is mushroom-shaped.

4. The stent of claim 2, wherein the radiopaque marker is press-fit into one of said eyelets.

5. The stent of claim 2, wherein the radiopaque marker comprises gold.

6. The stent of claim 2, wherein the radiopaque marker comprises tantalum.

7. The stent of claim 2, wherein the radiopaque marker is selected to have an electromotive force to match an electromotive force of a remainder of the stent.

8. The stent of claim 1, wherein the eyelets integrally formed on the distal end of said single ring positioned adjacent the second distal end extend beyond a first plane extending transversally to the longitudinal axis of the stent, the stent having a plurality of apexes on said single ring positioned adjacent the second distal end, the plurality of apexes substantially positioned on the first plane, and the eyelet integrally formed on the proximal end of said single ring positioned adjacent the first proximal end extends beyond a second plane extending transversally to the longitudinal axis of the stent, the stent having a plurality of apexes on said single ring positioned adjacent the first proximal end, the plurality of apexes substantially positioned on the second plane.

9. The stent of claim 1, wherein the stent is coated with a drug capable of being eluted over time.

10. The stent of claim 1, wherein the stent has a tapered shape when expanded to the expanded diameter.

11. The stent of claim 10, wherein the stent tapers along its entire length from the first proximal end to the second distal end.

12. The stent of claim 1, wherein the stent is substantially conical in shape.

13. The stent of claim 1, wherein the single ring positioned adjacent the first proximal end is substantially cylindrical and the single ring positioned adjacent the second distal end is substantially conical.

14. The stent of claim 1, wherein the stent is configured to conform to a shape of the vascular bifurcation in an area of a widened transition zone when expanded.

15. A stent for treating a vascular bifurcation, comprising:

a first proximal end, a second distal end and a longitudinal axis therebetween;

a plurality of segments extending coaxially end to end along the longitudinal axis, each segment consisting of a single ring which forms a circumference of the stent, wherein each single ring comprises a plurality of struts extending in an end to end manner creating a zig zag pattern in which each strut extends from a proximal end of the said each single ring to a distal end of said each single ring,

wherein the stent is expandable from a reduced diameter to an expanded diameter and configured to provide support to the vascular bifurcation when expanded, the second distal end having a larger diameter than the first proximal end when expanded;

wherein the plurality of segments consists of five segments and adjacent segments of said five segments are connected to each other by only straight links; and

wherein one of the single rings is positioned adjacent the second distal end and comprises three and no more than three eyelets integrally formed on a distal end of said single ring, and one of the single rings is positioned adjacent the first proximal end and comprises one and no more than one eyelet integrally formed on a proximal end of said single ring, wherein each eyelet comprises an opening configured to receive a radiopaque marker therein, and the opening is oval in shape and has a circumferential dimension greater than an axial dimension.

16. The stent of claim 15, wherein the stent has a tapered shape when expanded to the expanded diameter.

17. The stent of claim 15, wherein the stent tapers along its entire length from the first proximal end to the second distal end.

18. The stent of claim 15, wherein the stent is substantially conical in shape.

19. The stent of claim 15, wherein the single ring positioned adjacent the first proximal end is substantially cylindrical and the single ring positioned adjacent the second distal end is substantially conical.