Flexible vascular occluding device

• US 20050267568A1
• Filed: 05/25/2005
• Published: 12/01/2005
• Est. Priority Date: 05/25/2004
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Chestnut Medical Technologies, Inc. (Medtronic Plc)
• Inventors: Tran, Quang Quoc, Berez, Aaron Lee
• Granted Patent: US 8,398,701 B2
• Time in Patent Office: Days
• US Class Current: 623/1.350
• CPC Class Codes: A61B 17/12022 Occluding by internal devices, e.g. balloons or releasable wires plugging an opening in the wall of an organ A61B17/0057; occluders for the cervical canal A61F6/146; vas deferens occluders A61F6/20
• CPC Class Codes: A61B 17/12109 in a blood vessel
• CPC Class Codes: A61B 17/12113 within an aneurysm
• CPC Class Codes: A61B 17/12118 for positioning in conjunction with a stent
• CPC Class Codes: A61B 2017/00867 shape memory effect for prostheses A61F2210/0014
• CPC Class Codes: A61B 2017/1205 Introduction devices
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2002/823 Stents, different from stent-grafts, adapted to cover an aneurysm
• CPC Class Codes: A61F 2230/001 Figure-8-shaped, e.g. hourglass-shaped
• CPC Class Codes: A61F 2230/0078 hyperboloidal
• CPC Class Codes: A61F 2230/0091 helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section
• CPC Class Codes: A61F 2230/0095 Saddle-shaped

Abstract

A vascular occluding device for modifying blood flow in a vessel, while maintaining blood flow to the surrounding tissue. The occluding device includes a flexible, easily compressible and bendable occluding device that is particularly suited for treating aneurysms in the brain. The neurovascular occluding device can be deployed using a micro-catheter. The occluding device can be formed by braiding wires in a helical fashion and can have varying lattice densities along the length of the occluding device. The occluding device could also have different lattice densities for surfaces on the same radial plane.

Claims

1. A device for positioning within a blood vessel for embolization of an aneurysm, said device including a plurality of woven ribbons, each said ribbon comprising an inner surface, an outer surface for positioning adjacent an inner wall of a vessel, said outer surface forming a portion of an outer circumference of said device between first and second ends of said device, and a plurality openings extending between said inner and outer surfaces, said outer surface of said device comprising between about 20 to about 50 percent of the total circumferential area of said device.

2. The device of claim 1 wherein said openings occupy between about 50 to about 80 percent of the total circumferential area of said device.

3. The device of claim 1 wherein said ribbons form a lattice structure along the length of said device.

4. The device of claim 3 wherein the density of the lattice structure is between about 25 to about 50 picks per inch.

5. The device of claim 1 wherein said device has a length, a first portion with a lattice density that restricts fluid flow there through in a direction at an angle to said length and a second portion having a lattice density that permits greater fluid flow there through relative to said first portion in said direction.

6. The device of claim 1 wherein said ribbon has a substantially rectangular cross section.

7. The device of claim 1 wherein said ribbon is woven such that it forms a lattice structure having areas of different lattice densities for positioning in predetermined locations within the vessel.

8. The device of claim 7 wherein said lattice density is greater in a first circumferentially extending area relative to the lattice density of a second circumferentially extending area that is axially spaced from said first area.

9. The device of claim 1 wherein said device is bifurcated such that a first end of the device includes a first axial opening and a second end of said device includes at least two axial openings.

10. The device of claim 9 wherein said bifurcated device is formed in vivo by weaving together portions of at least two of said devices.

11. The device of claim 1 comprising a length that can be adjusted during deployment such that the deployed length of the occluding device can be adjusted after the occluding device is loaded within a delivery catheter.

12. The device of claim 1 comprising regions for positioning proximate a branch or feeder portion of the vessel, said regions having a lesser lattice density relative to a region intended to be positioned proximate an aneurysm.

13. A braided device for occluding a portion of a vessel comprising an elongated flexible member having an asymmetrical braided pattern in which a first portion of the braided pattern allows a first amount of radial blood flow to pass there through and a second portion of the braided pattern allows a second amount of radial blood flow there through, said first amount being greater than said second amount.

14. The device of claim 13 wherein said braided pattern has a lattice density of about 20% to about 50% of a surface area of said device.

15. The device of claim 13 wherein said braid pattern is formed of interwoven ribbons having at least a first portion including a substantially rectangular cross section.

16. The device of claim 15 wherein said braided pattern forms a lattice structure along the length of said device having a lattice density between about 25 to about 50 picks per inch.

17. The device of claim 16 wherein said first and second portions include different lattice densities.

18. The device of claim 13 wherein said first portion includes a first circumferentially extending area, and said second portion includes a second circumferentially extending area that is axially spaced from said first area.

19. The device of claim 13 wherein said first portion includes a first axially extending area, and said second portion includes a second axially extending area that is circumferentially spaced from said first area.

20. The device of claim 13 wherein said device is bifurcated such that a first end of the device includes a first axial opening and a second end of said device includes at least two axial openings.

21. The device of claim 20 wherein said bifurcated device is formed in vivo by weaving together portions of at least two of said devices.

22. The device of claim 13 comprising a length that can be adjusted during deployment such that the deployed length of the occluding device can be adjusted after the occluding device is loaded within a delivery catheter.

23. The device of claim 13 comprising regions for positioning proximate a branch or feeder portion of the vessel, said regions having a lesser lattice density relative to a region intended to be positioned proximate an aneurysm.