Flexible stent with elevated scaffolding properties

• US 8,016,874 B2
• Filed: 05/23/2007
• Issued: 09/13/2011
• Est. Priority Date: 05/23/2007
• Status: Expired due to Fees

• Current Assignee: Abbott Laboratories Vascular Enterprises Limited (Abbott Laboratories)
• Original Assignee: Abbott Laboratories Vascular Enterprises Limited (Abbott Laboratories)
• Inventors: Casey, Brendan J.
• Primary Examiner(s): Isabella; David
• Assistant Examiner(s): Swaminathan; Seema
• Application Number:
  US11/805,584
• Publication Number:
  US 20080294239A1
• Time in Patent Office: 1,574 Days
• Field of Search: None
• 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 2002/91541 Adjacent bands are arranged out of phase
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2250/0031 made from both resorbable and non-resorbable prosthetic parts, e.g. adjacent parts

Abstract

A stent is disclosed that generates an elevated degree of scaffolding to a bodily vessel while retaining a highly flexible structure. In one embodiment, a stent includes an essentially tubular body formed by a web structure that is configured to expand from a contracted delivery configuration to an expanded deployed configuration and that is composed of a plurality of longitudinally adjacent web rings. Those web rings are formed by a plurality of web elements disposed circumferentially around the longitudinal axis of the stent and adjoined one to the other with a junction bend. Each junction bend in a first web ring is coupled to another junction bend in a neighboring ring with as-shaped connector, and the coupled junction bends are not longitudinally aligned but are instead laterally offset.

Claims

1. A stent comprising:

a web structure defining an essentially tubular body expandable from a contracted delivery configuration to an expanded deployed configuration;

a plurality of longitudinally adjacent web rings defining the web structure, each web ring including a plurality of sequentially adjoined web elements disposed substantially parallel to a longitudinal axis of the essentially tubular body when in the contracted delivery configuration, pairs of the plurality of sequentially adjoined web elements being sequentially adjoined at junction bends,

wherein each junction bend in a first web ring of the plurality of longitudinally adjacent web rings is connected to a second junction bend in a neighboring web ring of the plurality of longitudinally adjacent web rings by a S-shaped connector having a plurality of segments disposed one in relation to the other in step-wise configuration, a central segment of the plurality of segments within the connector is disposed in a direction essentially parallel to the longitudinal axis of the essentially tubular body; and

two junction bends of the junction bends connected by the S-shaped connector being laterally offset one in relation to the other with the central segment of the connector being disposed within a gap disposed between the two junction bends and radially offset from both of the two junction bends.

2. The stent of claim 1, wherein each of the web elements comprises a central member having a first and a second ends, wherein the central member is disposed essentially parallel to the longitudinal axis in the contracted delivery configuration, wherein the central member is connected at the first end to a first end member at a first obtuse angle, and wherein the central member is connected at the second end to a second end member at a second obtuse angle.

3. The stent of claim 2, wherein the first and the second obtuse angles are essentially equal.

4. The stent of claim 2, wherein the web elements of each web ring are nested one into the other in the contracted delivery configuration, and wherein the junction bends have an arcuate shape.

5. The stent of claim 2, wherein the web elements in the first web ring are oriented at approximately 180 degrees in relation to the web elements in the neighboring web ring.

6. The stent of claim 1, wherein the two essentially parallel segments translate one in relation to the other upon application of a bending force on the essentially tubular body, thereby providing flexibility to the essentially tubular body.

7. The stent of claim 1, wherein the S-shaped connectors have a cross-sectional area different from the cross-sectional area of the web elements.

8. The stent of claim 1, wherein the web structure is manufactured from a biocompatible material.

9. The stent of claim 1, wherein at least the S-shaped connectors are manufactured from a biodegradable material.

10. The stent of claim 1, wherein the web structure is configured to self-expand from the contracted delivery configuration to the expanded deployed configuration.

11. The stent of claim 10, wherein the web structure is manufactured from a shape memory material.

12. The stent of claim 1, wherein the web structure is configured to expand from the contracted delivery configuration to the expanded deployed configuration by application of pressure to an interior surface of the essentially tubular body.

13. The stent of claim 1, wherein pressure is applied to the interior surface by expanding an inflatable balloon disposed within the essentially tubular body.

14. The stent of claim 1, further comprising a coating disposed on the web structure, the coating comprising a bioactive agent.

15. A method of stenting a bodily vessel comprising:

providing a stent having a web structure defining an essentially tubular body expandable from a contracted delivery configuration to an expanded deployed configuration, a plurality of longitudinally adjacent web rings defining the web structure, each web ring including a plurality of sequentially adjoined web elements, the web elements being disposed substantially parallel to a longitudinal axis of the essentially tubular body in the contracted delivery configuration, pairs of the plurality of sequentially adjoined web elements being sequentially adjoined at a junction bend, each junction bend in a first web ring of the plurality of longitudinally adjacent web rings being connected to a second junction bend in a neighboring web ring of the plurality of longitudinally adjacent web rings by a S-shaped connector to define the web structure, the S-shaped connector comprises a plurality of segments disposed one in relation to the other in step-wise configuration, a central segment of the plurality of segments within the connector being disposed in a direction essentially parallel to the longitudinal axis of the essentially tubular body, two junction bends connected by the S-shaped connector being laterally offset one in relation to the other with the central segment of the connector being disposed within a gap disposed between the two junction bends and radially offset from both of the two junction bends;

disposing the stent in the contracted delivery configuration in the bodily vessel; and

causing the stent to expand from the contracted delivery configuration to the expanded deployed configuration, thereby providing a supporting structure to the bodily vessel.

16. The method of claim 15, wherein the two essentially parallel segments translate one in relation to the other by application of a bending force on the essentially tubular body, thereby providing flexibility to the essentially tubular body.

17. The method of claim 15, further comprising the step of deploying the stent by applying pressure to an interior surface of the essentially tubular body.

18. The method of claim 15, wherein providing the stent comprises providing the web structure configured to self-expand from the contracted delivery configuration to the expanded deployed configuration.

19. A stent comprising:

a web structure defining an essentially tubular body expandable from a contracted delivery configuration to an expanded deployed configuration;

a plurality of longitudinally adjacent web rings defining the web structure, each web ring including a plurality of sequentially adjoined web elements disposed substantially parallel to a longitudinal axis of the essentially tubular body when in the contracted delivery configuration, pairs of the plurality of sequentially adjoined web elements being sequentially adjoined at junction bends,

wherein each junction bend in a first web ring of the plurality of longitudinally adjacent web rings is connected to a second junction bend in a neighboring web ring of the plurality of longitudinally adjacent web rings by an S-shaped connector having a plurality of segments disposed one in relation to the other in step-wise configuration, a central segment of the S-shaped connector being disposed in a direction essentially parallel to the longitudinal axis of the essentially tubular body, each S-shaped connected being orientated in the same orientation along the length of the web structure; and

two junction bends of the junction bends connected by the connector being laterally and radially offset one in relation to the other, the central segment of the connector being disposed within a gap formed by the lateral and radial offset of the two junction bends and being radially offset from both of the two junction bends.

20. The stent of claim 19, wherein the web elements of each web ring are nested one into the other in the contracted delivery configuration, and wherein the junction bends have an arcuate shape.

21. The stent of claim 19, wherein the two essentially parallel segments translate one in relation to the other upon application of a bending force on the essentially tubular body, thereby providing flexibility to the essentially tubular body.

22. The stent of claim 19, wherein the web structure is configured to self-expand from the contracted delivery configuration to the expanded deployed configuration.

23. The stent of claim 19, wherein the web structure is configured to expand from the contracted delivery configuration to the expanded deployed configuration by application of pressure to an interior surface of the essentially tubular body.