CA2253546A1 - Bifurcated stent and method for the manufacture of same - Google Patents

Bifurcated stent and method for the manufacture of same

Info

Publication number
CA2253546A1
CA2253546A1 CA002253546A CA2253546A CA2253546A1 CA 2253546 A1 CA2253546 A1 CA 2253546A1 CA 002253546 A CA002253546 A CA 002253546A CA 2253546 A CA2253546 A CA 2253546A CA 2253546 A1 CA2253546 A1 CA 2253546A1
Authority
CA
Canada
Prior art keywords
stent
stent section
section
method defined
bifurcated
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.)
Granted
Application number
CA002253546A
Other languages
French (fr)
Other versions
CA2253546C (en
Inventor
Ian M. Penn
Donald R. Ricci
George A. Shukov
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.)
Evysio Medical Devices ULC
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CA2253546A priority Critical patent/CA2253546C/en
Publication of CA2253546A1 publication Critical patent/CA2253546A1/en
Application granted granted Critical
Publication of CA2253546C publication Critical patent/CA2253546C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
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    • 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
    • A61F2/856—Single tubular stent with a side portal passage
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    • 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
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    • 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
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    • 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
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    • 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
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    • 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
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    • 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
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    • 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
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    • 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
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    • 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
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Abstract

An expandable bifurcated stent comprising a proximal end and a distal end in communication with one another. The proximal end comprises a primary passageway and the distal end comprises a pair of secondary passageways. The stent is expandable from a first, contracted position to a second, expanded position upon the application of a radially outward force exerted on the stent. Each of the primary passageway and the secondary passageway being constructed has a porous surface. A method for production of a bifurcated stent is also described. Preferably, the method comprises the step of connecting a first stent section to a second stent section, the first stent section having an end thereof adapted for connection to an opening disposed along the length of a second stent section.

Claims (39)

1. An expandable bifurcated stent comprising a proximal end and a distal end in communication with one another, the proximal end comprising a primary passageway and the distal end comprising a pair of secondary passageways, each secondary passageway in communication with the primary passageway at a first intersection, the stent being expandable from a first, contracted position to a second, expanded position upon the application of a radially outward force exerted on the stent, each of the primary passageway and the secondary passageways being constructed of a tubular wall in the form of a substantially cylindrical tube having preselected thereof removed to define a porous surface, at least one connection portion being disposed at the first intersection for reinforcing reinforcing the first intersection.
2. The bifurcated stent defined in claim 1. wherein the stent comprises a first stent section connected to a second stent section.
3. the bifurcated stent defined in claim 2, wherein an end of the first stent section is connected to an opening disposed along a length of the second stent section.
4. The bifurcated stent defined in claim 3, wherein a first connection portion is disposed at an end of the first stent section and is connect to the second stent section.
5. The bifurcated stent defined in claim 4, wherein the first connection portion as integral with an end of the first stent section.
6. The bifurcated stent defined in claim 4, wherein the first connection portion comprises a porous section and a non-porous section, the non-porous section connected the second stent section.
7. The bifurcated stent defined in claim 6, wherein the porous section comprises a plurality of elongate slots.
8. The bifurcated stent defined in claim 7, wherein the elongate slots traverse the thickness of the at least one connection tab.
9. The bifurcated stent defined in claim 7, wherein the elongate slots are disposed substantially orthogonal to a longitudinal axis of the first stent section.
10. The bifurcated stent defined in claim 1, wherein the second stent section comprises a second connection portion along at least a portion of the periphery of the opening, the second connection portion connected to the first stent section.
11. The bifurcated stent defined in claim 2, wherein the first stent section and the second stent section are coaxially disposed with respect to one another along at least a portion of the primary passageway.
12. The bifurcated stent defined in claim 2, wherein the first stent section and the second stent section are coaxially disposed with respect to one another along substantially the entire length of the primary passageway.
13. The bifurcated stent defined in claim 2, wherein the first stent section and the second stent section are connected to one another and to a third stent section, at least one of the stent sections comprising the primary passageway and each of the other to stent sections comprising a secondary passageway.
14. The bifurcated stent defined in claim 1, wherein the at least one connection portion interconnects the pair of secondary passageways.
15. The bifurcated stent defined in claim 1, wherein the at least one connection portion connects one of the pair of second passageways to the primary passageway.
16. A method for production of a bifurcated stent comprising the step of connecting a first stent section ro a second stent section, the first stent section having an end thereof adapted for connection to an opening disposed along the length of a second stent section; the first stent section and the second stent section being constructed of a tubular wall in the form of a substantially cylindrical tube having preselected portions thereof removed to define a porous surface.
17. The method defined in claim 16, wherein the end of the first stent section adapted for connection is bevelled with respect to a longitudinal axis of the first stent section.
18. The method defined in claim 16, comprising the further step of disposing at least one first flap portion at the end of the first stent section adapted for connection to a portion the second stent section.
19. The method defined in claim 18, wherein the at least one flap portion comprises a connection tab having a non-porous surface disposed on at least a portion thereof.
20. The method defined in claim 18, wherein the at least one flap portion comprises a connection tab having a porous surface disposed on at least a portion thereof.
21. The method defined in claim 20, wherein the porous surface comprises a plurality of substantially elongate slots.
22. The method defined in claim 18, wherein the at least one flap portion comprises a connection tab having both a porous surface and non-porous surface disposed thereon.
23. The method defined in claim 22, wherein the porous surface comprises a plurality of substantially elongate slots.
24. The method defined in claim 18, wherein the at least one first flap portion is produced-by folding from the end of the first stent section adjacent the bevelled cut.
25. The method defined in claim 18, wherein prior to the connecting step, the at least one first flap portion is trimmed to a reduced size.
26. The method defined in claim 18, comprising the further step of overlapping at least one first flap portion of the first stent section on to a portion of the second stent section.
27. The method defined in claim 26, wherein the connecting step comprises welding the at least one first flap portion of the first stent section to the second stent section.
28. The method defined in claim 18, wherein, prior to the connecting step, the at least one first flap portion is removed.
29. The method defined in claim 16, comprising the further step of disposing at least one second flap portion at a periphery of the opening disposed along the length of the second stent section.
30. The method defined in claim 16, comprising the further step of disposing a pair of second flap portions at a periphery of the opening disposed along the length of the second stent section.
31. The method defined in claim 30, wherein, prior to the connecting step, at least one second flap portion is trimmed to a reduced size.
32. The method defined in claim 30, comprising the further step of overlapping the at least one second flap portion of the second stent section on to a portion of the first stent section.
33. The method defined in any one of claims 32, wherein the connecting step comprises welding the at least one second flap portion of the second stent section to the first stent section.
34. The method defined in claim 30, wherein, prior to the connecting step, at least one second flap portion is removed.
35. The method defined in claim 16, comprising the further steps of producing the second stent section by:
providing a pair of third stent section each third stent sections having an end thereof bevelled with respect to a longitudinal axis of the third stent section;
joining the pair of third stent sections in a complementary manner at each bevelled end thereof to provide a substantially V-shaped stent section; andremoving an apex portion of the V-shaped stent section to define the second stent section having an opening therein.
36. The method defined in claim 35, wherein the connecting step comprises connecting the end of the stent section to the opening defined in the V-shaped stent section.
37. The method defined in claim 16, wherein the connecting step comprises welding first stent section to the second stent section.
38. A method for production of a bifurcated stent comprising steps of:
passing a first stent section having a first opening disposed along a length thereof through a second stent section having a second opening disposed along a length thereof, the first stent section having a diameter less than a diameter of the second stent section;
passing a leading end of first stent section through the second opening of the second stent section; and substantially aligning the first opening and the second opening with respect to one another;
the first stent section and the second stent section being constructed of a tubular wall in the form of substantially cylindrical tube having preselected portions thereof removed to define a porous surface.
39. An expandable bifurcated stent comprising a proximal end and a distal end in communication with one another, the proximal end comprising a primary passageway and the distal end comprising a pair of secondary passageways, each secondary passageway in communication with the primary passageway at a first intersection, the stent being expandable from a first, connected position to a second, expanded position upon the application of a radially outward force exerted on the stent, each of the primary passageway and the secondary passageways having a porous surface, at least one connection portion interconnecting the pair of secondary passageways for reinforcing the first intersection.
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