Process for manufacturing a braided bifurcated stent

• US 20040073300A1
• Filed: 07/30/2003
• Published: 04/15/2004
• Est. Priority Date: 01/31/2000
• Status: Active Grant

• Current Assignee: Lifeshield Sciences LLC (Acacia Research Corporation)
• Original Assignee: Dennis A. Peiffer, Paul F. Chouinard
• Inventors: Chouinard, Paul F., Peiffer, Dennis A.
• Granted Patent: US 7,004,967 B2
• Time in Patent Office: Days
• US Class Current: 623/1.53
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2002/065 Y-shaped blood vessels
• CPC Class Codes: A61F 2002/821 Ostial stents
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2230/001 Figure-8-shaped, e.g. hourglass-shaped
• CPC Class Codes: A61F 2230/0067 conical
• CPC Class Codes: A61F 2250/0036 differing in thickness
• CPC Class Codes: A61F 2250/0039 differing in diameter
• CPC Class Codes: D04C 1/06 Braid or lace serving particular purposes
• CPC Class Codes: D04C 3/14 Spool carriers
• CPC Class Codes: D04C 3/40 for making tubular braids by circulating strand supplies around braiding centre at equal distances
• CPC Class Codes: D04C 3/48 Auxiliary devices
• CPC Class Codes: D10B 2509/06 Vascular grafts; stents

Abstract

A process for manufacturing a braided birfurcated stent involves the use of two or more braiding machines. In this process, a first discrete plurality of filaments are braided to form a first leg, and a second discrete plurality of filaments are braided to form a second leg. Either the same braiding machine may be used or two different braiding machines may be used. The process also involves braiding the first plurality of filaments and the second plurality of filaments together to form the body using yet another braiding machine. Either the legs or body may be braided first.

Claims

1. A process for constructing a braided, branched stent having a body and a first and second leg, each of said first and second legs comprising a discrete plurality of filaments, the process comprising the steps of:

(a) braiding a first discrete plurality of filaments to form the first leg using a first braiding machine for accommodating at least a first number of bobbin carriers;

(b) braiding a second discrete plurality of filaments to form the second leg using said first braiding machine; and

(c) braiding the first plurality of filaments and the second plurality of filaments together to form the body using a second braiding machine for accommodating at least a second number of bobbin carriers that is different from said first number.

2. The process of claim 1, wherein each bobbin carrier is adapted to hold a bobbin having a filament wound thereon, a first plurality of bobbins is used in step (a), and a second plurality of bobbins equal in number to the first plurality is used in step (b), the process further comprising:

performing steps (a) and (b) before step (c);

after step (a) transferring the first plurality of bobbins to a first bobbin rack;

after step (b) transferring the second plurality of bobbins to a second bobbin rack; and

prior to step (c) transferring the first and second plurality of bobbins from the first and second bobbin racks onto the second braiding machine.

3. The process of claim 2, wherein said first rack and said second rack are semicircular and, prior to step (c), said first rack and said second rack are joined to form a circular rack.

4. The process of claim 1, wherein each bobbin carrier is adapted to hold a bobbin having a filament wound thereon, a first plurality of bobbins is used in step (a), and a second plurality of bobbins equal in number to the first plurality is used in step (b), the process further comprising:

performing steps (a) and (b) before step (c);

after step (a) transferring the first plurality of bobbins to a first bobbin rack in a first orientation and then to the second braiding machine;

after step (b) transferring the second plurality of bobbins to the first bobbin rack in a second orientation and then to the second braiding machine.

5. The process of claim 1, wherein each bobbin carrier is adapted to hold a bobbin having a filament wound thereon, a first plurality of bobbins is used in step (a), and a second plurality of bobbins equal in number to the first plurality is used in step (b), the process further comprises:

performing step (c) before steps (a) and (b);

after step (c) transferring the first plurality of bobbins from the second machine to a first bobbin rack and transferring the second plurality of bobbins from the second machine to a second bobbin rack;

prior to step (a) transferring the first plurality of bobbins from the first rack onto the first braiding machine; and

prior to step (b) transferring the second plurality of bobbins from the second rack onto the first braiding machine.

6. The process of claim 5, wherein said first rack and said second rack are semicircular and, prior to steps (a) and (b), said first rack and said second rack are joined to form a circular rack.

7. The process of claim 1 wherein the first number is less than a full capacity of the first braiding machine and the second number is less than a full capacity of the second braiding machine.

8. The process of claim 7 wherein each of the first number and the second number are equivalent to a capacity of the respective braiding machine that produces a 1:

1 braiding ratio.

9. The process of claim 8, wherein said first number of bobbin carriers is 12 and said second number of bobbin carriers is 24.

10. The process of claim 1 wherein each of the first number and the second number are equivalent to a capacity of the respective braiding machine that produces a 1:

1 braiding ratio.

11. A process for constructing a braided, branched stent having a body and a first and second leg, each of said first and second legs comprising a discrete plurality of filaments, the process comprising the steps of:

(a) braiding a first discrete plurality of filaments to form the first leg using a first braiding machine for accommodating at least a first number of bobbin carriers;

(b) braiding a second discrete plurality of filaments to form the second leg using a second braiding machine for accommodating at least a second number of bobbin carriers; and

(c) braiding the first plurality of filaments and the second plurality of filaments together to form the body using a third braiding machine for accommodating at least a third number of bobbin carriers that is different from said first and second numbers.

12. The process of claim 11 wherein the first number is equal to the second number.

13. The process of claim 11 wherein the third number is equal to the first number plus the second number.

14. The process of claim 11 wherein the first number is less than a full capacity of the first braiding machine, the second number is less than a full capacity of the second braiding machine, and third number is less than a full capacity of the third braiding machine.

15. The process of claim 14 wherein each of the first number, the second number, and the third number are equivalent to a capacity of the respective braiding machine that produces a 1:

1 braiding ratio.

16. The process of claim 11 wherein each of the first number, the second number, and the third number are equivalent to a capacity of the respective braiding machine that produces a 1:

1 braiding ratio.

17. The process of claim 11, wherein each bobbin carrier is adapted to hold a bobbin having a filament wound thereon, a first plurality of bobbins is used in step (a), and a second plurality of bobbins is used in step (b), the process further comprises:

performing steps (a) and (b) before step (c);

after step (a) transferring the first plurality of bobbins to a first bobbin rack;

after step (b) transferring the second plurality of bobbins to a second bobbin rack; and

prior to step (c) transferring the first and second plurality of bobbins from the first and second bobbin racks onto the third braiding machine.

18. The process of claim 17, wherein said first rack and said second rack are semicircular and, prior to step (c), said first rack and said second rack are joined to form a circular rack.

19. The process of claim 11, wherein each bobbin carrier is adapted to hold a bobbin having a filament wound thereon, a first plurality of bobbins is used in step (a), and a second plurality of bobbins is used in step (b), the process further comprising:

performing steps (a) and (b) before step (c);

after step (a) transferring the first plurality of bobbins to a bobbin rack in a first orientation and then to the third braiding machine; and

after step (b) transferring the second plurality of bobbins to a the bobbin rack in a second orientation and then to the third braiding machine.

20. The process of claim 11, wherein each bobbin carrier is adapted to hold a bobbin having a filament wound thereon, a first plurality of bobbins is used in step (a), and a second plurality of bobbins is used in step (b), the process further comprises:

performing step (c) before steps (a) and (b);

after step (c) transferring the first plurality of bobbins from the third braiding machine to a first bobbin rack and transferring the second plurality of bobbins from the third braiding machine to a second bobbin rack;

prior to step (a) transferring the first plurality of bobbins from the first rack onto the first braiding machine; and

prior to step (b) transferring the second plurality of bobbins from the second rack onto the second braiding machine.

21. The process of claim 20, wherein said first rack and said second rack are semicircular and, prior to steps (a) and (b), said first rack and said second rack are joined to form a circular rack.

22. The process of claim 15, wherein said first number of bobbin carriers is 12, said second number of bobbin carriers is 12, and said third number of bobbin carriers is 24.