Stent with reduced profile

• US 8,790,388 B2
• Filed: 03/02/2012
• Issued: 07/29/2014
• Est. Priority Date: 03/03/2011
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Mickley, Timothy J.
• Primary Examiner(s): MILES, JONATHAN WADE
• Application Number:
  US13/410,543
• Publication Number:
  US 20120226342A1
• Time in Patent Office: 879 Days
• Field of Search: 606/108, 623/1.11, 623/1.12, 623/1.13, 623/1.14, 623/1.15, 623/1.16, 623/1.17, 623/1.18, 623/1.19, 623/1.2, 623/1.21, 623/1.28
• US Class Current: 623/1.11
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• 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 2250/0039 differing in diameter
• CPC Class Codes: A61M 2025/1004 Balloons with folds, e.g. folded or multifolded

Abstract

Medical devices, systems, and techniques are described for reducing the profile of a stent. In one example, a stent having a reduced state and an expanded state includes a plurality of interconnected annular rings arranged about a longitudinal axis, each of the plurality of annular bands comprising a plurality of peaks and a plurality of troughs, wherein in the reduced state, at least one of the plurality of peaks of at least one of the plurality of rings is positioned a first distance from the longitudinal axis, another one of the plurality of peaks being positioned a second distance from the longitudinal axis, the first distance being less than the second distance, and wherein in the expanded state, the plurality of peaks of the stent being positioned at substantially the same distance from the longitudinal axis.

Claims

1. A stent delivery system comprising:

a catheter comprising an expandable balloon, the balloon having a pleated state and an unpleated state, the balloon having at least two pleats in the pleated state, adjacent pleats of a balloon being separated by a fold in the pleated state; and

a stent having a reduced state and an expanded state, the stent comprising a plurality of interconnected annular rings arranged about a longitudinal axis, each of the plurality of annular rings comprising a plurality of peaks and a plurality of troughs,

wherein in the reduced state and positioned on the balloon, at least one of the plurality of peaks of at least one of the plurality of rings extends into a fold of the balloon in the pleated state the at least one peak being positioned a first distance from the longitudinal axis, another one of the plurality of peaks being positioned a second distance from the longitudinal axis, the first distance being less than the second distance,

wherein in the expanded state, the plurality of peaks of the stent being positioned at substantially the same distance from the longitudinal axis,

wherein the plurality of peaks are defined by a plurality of struts,

wherein the at least one peak that extends into the fold comprises at least one first strut having a first thickness,

wherein each of the remaining peaks of the annular band comprise at least one second strut having a second thickness, and

wherein the first thickness is less than the second thickness.

2. The stent delivery system of claim 1,

wherein the at least one peak that extends into the fold comprises at least one first strut having a first width,

wherein each of the remaining peaks of the annular ring comprise at least one second strut having a second width, and

wherein the first width is less than the second width.

3. The stent delivery system of claim 1,

wherein the fold is a first fold of the balloon, and

wherein at least one of the plurality of troughs of at least one of the plurality of rings extends into a second fold of the balloon in the pleated state, the at least one trough being positioned a third distance from the longitudinal axis, another one of the plurality of peaks being positioned a fourth distance from the longitudinal axis, the third distance being less than the fourth distance.

4. The stent delivery system of claim 3,

wherein the plurality of troughs are defined by a plurality of struts,

wherein the at least one trough that extends into the fold comprises at least one first strut having a first thickness,

wherein each of the remaining troughs of the annular ring comprise at least one second strut having a second thickness, and

wherein the first thickness is less than the second thickness.

5. The stent delivery system of claim 1,

wherein in the reduced state and positioned on the balloon, at least one of the plurality of peaks of each of the plurality of rings extends into a fold of the balloon in the pleated state.

6. The stent delivery system of claim 5,

wherein the at least one peak that extends into the fold comprises at least one first strut having a first width,

wherein each of the remaining peaks of the annular ring comprise at least one second strut having a second width, and

wherein the first width is less than the second width.

7. The stent delivery system of claim 1,

wherein during an expansion from the reduced state to the expanded state, the at least one peak that extends into the fold is configured to expand outwardly prior to the remaining peaks.

8. The stent delivery system of claim 7,

wherein the at least one peak configured to expand outwardly prior to the remaining peaks comprises at least one strut having a first width,

wherein the remaining peaks comprise a plurality of struts that each have a second width, and

wherein the first width is less than the second width.

9. A stent having a reduced state and an expanded state, the stent comprising:

a plurality of interconnected annular rings arranged about a longitudinal axis, each of the plurality of annular rings comprising a plurality of peaks and a plurality of troughs,

wherein in the reduced state, at least one of the plurality of peaks of at least one of the plurality of rings is positioned a first distance from the longitudinal axis, another one of the plurality of peaks being positioned a second distance from the longitudinal axis, the first distance being less than the second distance,

wherein in the expanded state, the plurality of peaks of the stent being positioned at substantially the same distance from the longitudinal axis,

wherein the plurality of peaks are defined by a plurality of struts,

wherein the at least one peak positioned a first distance from the longitudinal axis comprises at least one first strut having a first thickness,

wherein each of the remaining peaks of the annular band comprise at least one second strut having a second thickness, and

wherein the first thickness is less than the second thickness.

10. The stent of claim 9,

wherein at least one of the plurality of troughs of at least one of the plurality of rings is positioned a third distance from the longitudinal axis, another one of the plurality of peaks being positioned a fourth distance from the longitudinal axis, the third distance being less than the fourth distance.

11. The stent of claim 10,

wherein the plurality of troughs are defined by a plurality of struts,

wherein the at least one troughs that extends into the fold comprises at least one first strut having a first thickness,

wherein each of the remaining troughs of the annular band comprise at least one second strut having a second thickness, and

wherein the first thickness is less than the second thickness.

12. The stent of claim 10,

wherein the plurality of troughs are defined by a plurality of struts,

wherein the at least one trough positioned a third distance from the longitudinal axis comprises at least one first strut having a first width,

wherein each of the remaining troughs of the annular ring comprise at least one second strut having a second width, and

wherein the first width is less than the second width.

13. The stent of claim 9,

wherein the at least one peak positioned a first distance from the longitudinal axis comprises at least one first strut having a first width,

wherein each of the remaining peaks of the annular ring comprise at least one second strut having a second width, and

wherein the first width is less than the second width.

14. The stent of claim 9,

wherein during an expansion from the reduced state to the expanded state, the at least one peak that is positioned the first distance from the longitudinal axis in the reduced state is configured to expand outwardly prior to the remaining peaks.

15. The stent of claim 14,

wherein the at least one peak configured to expand outwardly prior to the remaining peaks comprises at least one strut having a first width,

wherein the remaining peaks comprise a plurality of struts that each have a second width, and

wherein the first width is less than the second width.

16. A stent having a reduced state and an expanded state, the stent comprising:

a plurality of interconnected annular rings arranged about a longitudinal axis, each of the plurality of annular rings comprising a plurality of peaks and a plurality of troughs,

wherein in the reduced state, at least one of the plurality of peaks of at least one of the plurality of rings is positioned a first distance from the longitudinal axis, another one of the plurality of peaks being positioned a second distance from the longitudinal axis, the first distance being less than the second distance,

wherein in the expanded state, the plurality of peaks of the stent being positioned at substantially the same distance from the longitudinal axis,

wherein the plurality of peaks are defined by a plurality of struts,

wherein the at least one peak positioned a first distance from the longitudinal axis comprises at least one first strut having a first width,

wherein each of the remaining peaks of the annular band comprise at least one second strut having a second width, and

wherein the first width is less than the second width.

17. The stent of claim 16,

wherein at least one of the plurality of troughs of at least one of the plurality of rings is positioned a third distance from the longitudinal axis, another one of the plurality of peaks being positioned a fourth distance from the longitudinal axis, the third distance being less than the fourth distance.

18. The stent of claim 16,

wherein during an expansion from the reduced state to the expanded state, the at least one peak that is positioned the first distance from the longitudinal axis in the reduced state is configured to expand outwardly prior to the remaining peaks.