Stent with varying radius between struts

• US 9,180,031 B2
• Filed: 03/15/2013
• Issued: 11/10/2015
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Noffke, Paul, Zhang, Zhiyong, Vogel, Jeffrey H
• Primary Examiner(s): Sweet, Thomas J
• Assistant Examiner(s): Schutte, Wade P
• Application Number:
  US13/834,840
• Publication Number:
  US 20140277380A1
• Time in Patent Office: 970 Days
• Field of Search: 623/1.12, 623/1.13, 623/1.15, 623/1.16, 623/1.17, 623/1.2
• US Class Current: 1/1
• CPC Class Codes: A61F 2/844 folded prior to deployment
• CPC Class Codes: A61F 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2002/91508 the meander having a difference in amplitude along the band
• CPC Class Codes: A61F 2002/91516 the meander having a change in frequency along the band
• CPC Class Codes: A61F 2002/91575 connected peak to trough

Abstract

A stent comprising a stent body and a plurality of cells is disclosed. Each cell includes two structural members extending in an undulating pattern. Each structural member includes a plurality of cell segments defining a plurality of peaks and valleys therebetween. A first segment and a second segment defining a first peak, the second segment and a third segment defining a first valley, the third segment and a fourth segment defining a second peak, the fourth segment and a fifth segment defining a second valley, the fifth segment and a sixth segment defining a third peak. The first peak, the second peak and the first valley include a first radius of curvature. The third peak and the second valley include a second radius of curvature. The first radius of curvature is larger than the second radius of curvature.

Claims

1. A stent comprising:

a stent body defining a length and comprising a plurality of cells;

each cell comprising two structural members extending in an undulating pattern;

each structural member comprising a plurality of cell segments defining a plurality of peaks of valleys therebetween, a first segment and a second segment defining a first peak, the second segment and a third segment defining a first valley, the third segment and a fourth segment defining a second peak, the fourth segment and a fifth segment defining a second valley, the fifth segment and a sixth segment defining a third peak;

wherein the first peak and the first valley include a first radius of curvature, wherein the second peak, the third peak and the second valley include a second radius of curvature, and wherein the first radius of curvature is larger than the second radius of curvature.

2. The stent of claim 1, wherein the first radius of curvature is between about 200% and about 700% larger than the second radius of curvature.

3. The stent of claim 1, wherein the first radius of curvature is between about 500% and about 600% larger than the second radius of curvature.

4. The stent of claim 1, wherein the first radius of curvature is about 250% larger than the second radius of curvature.

5. The stent of claim 1, wherein the first radius of curvature is between about 0.0030 inches and about 0.0040 inches.

6. The stent of claim 5, wherein the second radius of curvature is between about 0.0001 inches and about 0.0010 inches.

7. The stent of claim 1, wherein each structural member includes a seventh segment and an eighth segment, the sixth segment and the seventh segment defining a third valley, and the seventh segment and the eighth segment defining a fourth peak, wherein the third valley includes the second radius of curvature, and wherein the fourth peak includes the first radius of curvature.

8. The stent of claim 7, wherein the first radius of curvature is between about 200% and about 700% larger than the second radius of curvature.

9. The stent of claim 7, wherein the first radius of curvature is between about 0.0030 inches and about 0.0040 inches, and wherein the second radius of curvature is between about 0.0001 inches and about 0.0010 inches.

10. The stent of claim 9, wherein the stent body includes a predeployed inside diameter of between about 0.0500 inches and about 0.0600 inches.

11. The stent of claim 1, wherein the first radius of curvature is between about 250% and about 700% larger than the second radius of curvature.

12. The stent of claim 1, wherein, when the stent is deformed, a peak strain at the first peak and the first valley is greater than a peak strain at the second peak, the third peak and the second valley.