Bend-capable stent prosthesis

• US 10,231,854 B2
• Filed: 05/12/2016
• Issued: 03/19/2019
• Est. Priority Date: 05/18/2006
• Status: Active Grant

• Current Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Original Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Inventors: Wack, Thilo
• Primary Examiner(s): Severson, Ryan J.
• Application Number:
  US15/153,643
• Publication Number:
  US 20160256299A1
• Time in Patent Office: 1,041 Days
• CPC Class Codes: A61F 2/844 folded prior to deployment
• 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 2/90 characterised by a net-like or mesh-like structure
• 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 2002/825 having longitudinal struts
• CPC Class Codes: A61F 2002/91516 the meander having a change in frequency along the band
• CPC Class Codes: A61F 2002/91525 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
• 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 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2230/0054 V-shaped

Abstract

A stent is described, which includes a plurality of stenting rings, each stenting ring including a plurality of struts and points of inflection, each point of inflection connecting adjacent struts, the points of inflection of adjacent stenting rings facing each other along an axis parallel to a longitudinal axis of the stent in a radially expanded stenting disposition while the stent is in an unbent configuration. Adjacent stenting rings are connected by connectors extending from a point of inflection on one stenting ring to a facing point of inflection on another stenting ring, the connectors being linear along an entire length thereof and parallel to the longitudinal axis of the stent, each of the connectors having a length shorter than a length of each of the struts.

Claims

1. A stent, comprising:

a plurality of stenting rings, each stenting ring including a plurality of struts and points of inflection, each point of inflection connecting adjacent struts, the points of inflection of adjacent stenting rings facing each other along an axis parallel to a longitudinal axis of the stent in a radially expanded stenting disposition while the stent is in an unbent configuration, the adjacent stenting rings including facing unconnected points of inflection designed to axially pass by each other without contacting when the stent is transitioned from the unbent configuration to a bent configuration, the plurality of stenting rings comprising;

a first stenting ring;

a second stenting ring connected to the first stenting ring by a plurality of first connectors extending from points of inflection on the first stenting ring to facing points of inflection on the second stenting ring;

a third stenting ring connected to the second stenting ring by a plurality of second connectors extending from points of inflection on the second stenting ring to facing points of inflection on the third stenting ring; and

a fourth stenting ring connected to the third stenting ring by a plurality of third connectors extending from points of inflection on the third stenting ring to facing points of inflection on the fourth stenting ring, wherein;

the plurality of first, second and third connectors are linear along an entire length thereof and parallel to the longitudinal axis of the stent, each having a length shorter than a length of each of the plurality of struts; and

the plurality of first connectors are longitudinally aligned with the plurality of third connectors along the longitudinal axis of the stent.

2. The stent according to claim 1, wherein:

the plurality of struts of each stenting ring have the same cross-section,

the length of each of the plurality of struts is greater than 1.25 mm, and

the length of each of the first, second, and third connectors is less than 1 mm.

3. The stent according to claim 2, wherein the plurality of struts of each stenting ring have an equal length, such that each of the points of inflection of each stenting ring lies in one of two circles transverse to the longitudinal axis of the stent.

4. The stent according to claim 1, wherein the number of struts “

N”

of the first stenting ring between circumferentially adjacent first connectors is such that N/2 is an even number.

5. The stent according to claim 1, wherein the number of struts “

N”

of the first stenting ring between circumferentially adjacent first connectors is such that N/2 is an odd number and N is more than 10.

6. The stent according to claim 1, wherein the plurality of second connectors are longitudinally aligned with a plurality of fourth connectors along the longitudinal axis of the stent, the plurality of fourth connectors connecting the fourth stenting ring to a fifth stenting ring.

7. The stent according to claim 1, comprising a shape memory alloy.

8. The stent according to claim 1, wherein the stent undergoes plastic deformation upon expansion to the radially expanded stenting disposition.

9. The stent according to claim 1, wherein the length of each of the plurality of first connectors is not more than 0.8 mm.

10. The stent according to claim 1, wherein the length of each of the plurality of first connectors is less than 0.6 mm.

11. The stent according to claim 1, wherein the length of each of the plurality of struts is in a range of from 1.3 mm to 2.0 mm.

12. The stent according to claim 1, wherein the length of each of the plurality of struts is in a range of from 1.4 mm to 2.0 mm.

13. The stent according to claim 1, wherein each of the plurality of stenting rings includes 32 struts.

14. The stent according to claim 1, wherein adjacent stenting rings are connected by four evenly spaced connectors.

15. The stent according to claim 1, wherein in the radially expanded stenting disposition:

each of the points of inflection on the first stenting ring connected to the plurality of first connectors connects adjacent struts forming a first included angle,

each of the points of inflection on the second stenting ring connected to the plurality of first connectors connects adjacent struts forming a second included angle, and

the first included angle is greater than the second included angle.

16. The stent according to claim 15, wherein in the radially expanded stenting disposition:

each of the points of inflection on the second stenting ring connected to the plurality of second connectors connects adjacent struts forming the first included angle, and

each of the points of inflection on the third stenting ring connected to the plurality of second connectors connects adjacent struts forming the second included angle.

17. The stent according to claim 16, wherein in the radially expanded stenting disposition:

each of the points of inflection on the third stenting ring connected to the plurality of third connectors connects adjacent struts forming the first included angle, and

each of the points of inflection on the fourth stenting ring connected to the plurality of third connectors connects adjacent struts forming the second included angle.

18. A stent, comprising:

a plurality of stenting rings, each stenting ring including a plurality of struts and points of inflection, each point of inflection connecting adjacent struts, the points of inflection of adjacent stenting rings facing each other along an axis parallel to a longitudinal axis of the stent in a radially expanded stenting disposition while the stent is in an unbent configuration, the plurality of stenting rings comprising;

a first stenting ring;

a second stenting ring connected to the first stenting ring by a plurality of first connectors extending from points of inflection on the first stenting ring to facing points of inflection on the second stenting ring;

a third stenting ring connected to the second stenting ring by a plurality of second connectors extending from points of inflection on the second stenting ring to facing points of inflection on the third stenting ring; and

a fourth stenting ring connected to the third stenting ring by a plurality of third connectors extending from points of inflection on the third stenting ring to facing points of inflection on the fourth stenting ring, wherein;

the plurality of first, second and third connectors are linear along an entire length thereof and parallel to the longitudinal axis of the stent, each having a length shorter than a length of each of the plurality of struts; and

the plurality of first connectors are longitudinally aligned with the plurality of third connectors along the longitudinal axis of the stent,

wherein in the radially expanded stenting disposition;

each of the points of inflection on the first stenting ring connected to the plurality of first connectors connects adjacent struts forming a first included angle,

each of the points of inflection on the second stenting ring connected to the plurality of first connectors connects adjacent struts forming a second included angle, and

the first included angle is greater than the second included angle.

19. The stent according to claim 18, wherein in the radially expanded stenting disposition:

each of the points of inflection on the second stenting ring connected to the plurality of second connectors connects adjacent struts forming the first included angle, and

each of the points of inflection on the third stenting ring connected to the plurality of second connectors connects adjacent struts forming the second included angle.

20. The stent according to claim 19, wherein in the radially expanded stenting disposition:

each of the points of inflection on the third stenting ring connected to the plurality of third connectors connects adjacent struts forming the first included angle, and

each of the points of inflection on the fourth stenting ring connected to the plurality of third connectors connects adjacent struts forming the second included angle.