CA2567302C - Stent having struts with reverse direction curvature - Google Patents

Stent having struts with reverse direction curvature Download PDF

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Publication number
CA2567302C
CA2567302C CA2567302A CA2567302A CA2567302C CA 2567302 C CA2567302 C CA 2567302C CA 2567302 A CA2567302 A CA 2567302A CA 2567302 A CA2567302 A CA 2567302A CA 2567302 C CA2567302 C CA 2567302C
Authority
CA
Canada
Prior art keywords
stent
strut
struts
loop
compressed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CA2567302A
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French (fr)
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CA2567302A1 (en
Inventor
Gregory Pinchasik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Medinol Ltd
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Medinol Ltd
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Filing date
Publication date
Application filed by Medinol Ltd filed Critical Medinol Ltd
Publication of CA2567302A1 publication Critical patent/CA2567302A1/en
Application granted granted Critical
Publication of CA2567302C publication Critical patent/CA2567302C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/91525—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/91533—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other characterised by the phase between adjacent bands
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/9155—Adjacent bands being connected to each other
    • A61F2002/91558—Adjacent bands being connected to each other connected peak to peak
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0028—Shapes in the form of latin or greek characters
    • A61F2230/0054—V-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0036—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in thickness

Abstract

Disclosed is a stent having struts with reverse direction curvature for providing a reduced compressed profile and an increased expanded profile. The strut configuration comprises a plurality of arcuate sections facing in opposite convex and a concave orientation. The strut width may be gradually decreased from its ends towards the strut's mid-section to redistribute maximal strains away from portions of the stent more susceptible to permanent deformation, such as the loop portions. Varying strut lengths to offset the maximum circumferential widths of adjacent portions of the stent may further reduce the compressed stent profile. The varied stent lengths may also contribute to an increased expanded stent profile. Stents with the reverse direction curvature strut design can obtain an expanded to compressed stent diameter ratio of about 7:1 compared to conventional stents that have a ratio of up to about 5:1. The curved strut can be utilized with any stent design.

Claims (22)

1. A stent, comprising:
a plurality of interconnected circumferential bands defining a cylindrical structure having a longitudinal axis;
each of the circumferential bands having a generally serpentine pattern and comprising a plurality of struts and plurality of loops, wherein each end of a strut is coupled to an end of a loop;
at least one of the circumferential bands having at least two adjacent struts comprising a plurality of arcuate sections, wherein each arcuate section has reverse curvature of opposing arcuate sections extending from each end to the mid-section of the strut wherein the plurality of arcuate sections substantially straighten when the stent is compressed; and each strut with arcuate sections has a cross-sectional area that is larger at the strut ends than in the midsection of the strut, said adjacent struts having varying lengths to produce axially offset positions of adjacent loops.
2. The stent according to claim 1, wherein said stent is self-expanding.
3. The stent according to claim 1, wherein said stent is balloon-expandable.
4. The stent according to claim 1, wherein the width of the loop is greater than the width of the strut.
5. The stent according to claim 2, wherein the stent has an expanded to compressed outside diameter ratio of greater than about 5:1.
6. The stent according to claim 2, wherein the stent has an expanded to compressed outside diameter ratio of about 7:1.
7. The stent according to claim 1, wherein maximal strain imparted on the stent when the stent is compressed is distributed toward the midsection of the struts.
8. The stent according to claim 1, wherein said at least one circumferential band includes at least one set of two struts with arcuate sections coupled to the ends of one loop, said set of loop and struts having a maximum circumferential width when the stent is compressed, the maximum circumferential width of each set of loop and struts being offset along the longitudinal axis from maximum circumferential widths of adjacent sets of loop and struts when the stent is compressed.
9. A stent, comprising:
a plurality of interconnected circumferential bands defining a cylindrical structure having a longitudinal axis;
each of the circumferential bands having a generally serpentine pattern and comprising a plurality of struts and plurality of loops, wherein each end of a loop is coupled to an end of two adjacent struts;
at least one circumferential band having adjacent struts comprising a plurality of arcuate sections, wherein each arcuate section in said adjacent struts has reverse curvature extending from each end to the mid-section of the strut and each strut has a varying width wherein the width at the ends of the strut is larger than the width of the remainder of the strut;

wherein the plurality of arcuate sections in the strut substantially straighten when the stent is compressed;
wherein each strut with arcuate sections has a cross-sectional area that gradually decreases in opposing directions from the ends of the strut;
said adjacent struts having varying lengths which result in axially offset adjacent loops.
10. The stent according to claim 9, wherein said stent is self-expanding.
11. The stent according to claim 9, wherein said stent is balloon-expandable.
12. The stent according to claim 9, wherein said loop is wider than said strut.
13. The stent according to claim 10, wherein the stent has an expanded to compressed outside diameter ratio of greater than about 5:1.
14. The stent according to claim 10, wherein the stent has an expanded to compressed outer diameter ratio of about 7:1.
15. The stent according to claim 9, wherein said at least one circumferential band comprises a multiplicity of sets of two adjacent struts coupled to the ends of a loop, each set of loop and struts having a maximum circumferential width when the stent is compressed, the maximum circumferential widths of adjacent sets of loop and struts being offset along the longitudinal axis when the stent is compressed.
16. A stent defining a cylindrical structure having a longitudinal axis comprising a plurality of cells, each of the plurality of cells comprising:
a first circumferential section having a generally serpentine pattern and comprising a plurality of first struts and at least one first loop, having said struts coupled to the ends of said first loop;

a second circumferential section having a generally serpentine pattern and comprising a plurality of second struts and second loops;

wherein said first struts of the first circumferential section further comprise a plurality of arcuate sections, wherein each arcuate section has reverse curvature of opposing arcuate sections extending from each end to the mid-section of the first strut, and each first strut has a varying width wherein the width at ends of said first strut is larger than the width of the remainder of the same strut;

the plurality of arcuate sections substantially straighten when the stent is compressed;

the ends of the first strut have greater cross-sectional area than the mid-section of the first strut; and said adjacent first struts have varying lengths which result in axially offset adjacent loops.
17. The stent according to claim 16, wherein the stent is self-expanding.
18. The stent according to claim 16, wherein said stent is balloon-expandable.
19. The stent according to claim 16, wherein said loop is wider than said strut.
20. The stent according to claim 17, wherein the stent has an expanded to compressed outside diameter ratio of greater than about 5:1.
21. The stent according to claim 17, wherein the stent has an expanded to compressed outside diameter ratio of about 7:1.
22. The stent according to claim 16, wherein said first loop and first struts in the first circumferential section have a maximum circumferential width when the stent is compressed, the maximum circumferential width of said first loop and first struts being offset along the longitudinal axis from maximum circumferential widths of adjacent first loop and first struts when the stent is compressed.
CA2567302A 2004-06-08 2005-06-03 Stent having struts with reverse direction curvature Expired - Fee Related CA2567302C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/864,685 US7763064B2 (en) 2004-06-08 2004-06-08 Stent having struts with reverse direction curvature
US10/864,685 2004-06-08
PCT/IB2005/001569 WO2005120394A2 (en) 2004-06-08 2005-06-03 Stent having struts with reverse direction curvature

Publications (2)

Publication Number Publication Date
CA2567302A1 CA2567302A1 (en) 2005-12-22
CA2567302C true CA2567302C (en) 2012-10-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2567302A Expired - Fee Related CA2567302C (en) 2004-06-08 2005-06-03 Stent having struts with reverse direction curvature

Country Status (8)

Country Link
US (1) US7763064B2 (en)
EP (1) EP1753368B1 (en)
JP (1) JP4580987B2 (en)
AU (1) AU2005251525B2 (en)
CA (1) CA2567302C (en)
ES (1) ES2425841T3 (en)
IL (1) IL179506A (en)
WO (1) WO2005120394A2 (en)

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US20050273157A1 (en) 2005-12-08
US7763064B2 (en) 2010-07-27
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