FLEXIBLE VASCULAR OCCLUDING DEVICE

• US 20110166592A1
• Filed: 03/10/2011
• Published: 07/07/2011
• Est. Priority Date: 05/25/2004
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Chestnut Medical Technologies, Inc. (Medtronic Plc)
• Inventors: Garcia, Adrian, Tran, Quang Q., Berez, Aaron L., Ye, Ting Tina
• Granted Patent: US 8,382,825 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• 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 17/12113 within an aneurysm
• CPC Class Codes: A61B 17/12118 for positioning in conjunction with a stent
• 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 2230/0078 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 system comprising:

a first occluding device comprising a number of strands of helically-wound material in a lattice structure arranged as a flexible tubular body, wherein the first occluding device comprises a first cross-sectional diameter, wherein each said strand of the first occluding device is circumferentially spaced from an adjacent said strand of the first occluding device by an arc angle calculated by dividing 360 degrees by the number of strands, wherein each said strand of the first occluding device comprises a first strand width determined at least partially by the arc angle and thickness of the first strand; and

a second occluding device comprising said number of strands of helically-wound material in a lattice structure arranged as a flexible tubular body, wherein the second occluding device comprises a second cross-sectional diameter different than the first cross-sectional diameter, wherein each said strand of the second occluding device is circumferentially spaced from an adjacent said strand of the second occluding device by the arc angle, wherein each said strand of the second occluding device comprises a second strand width determined at least partially by the arc angle and thickness of the second strand.

2. The system of claim 1, wherein said number of strands is 32, 48 or 64.

3. The device of claim 1, wherein the helically-wound material for at least one of the occluding devices comprises a picks-per-inch of 65, 130 or 260.

4. The system of claim 1, wherein the first and second strand widths have maximum values having a tolerance of 20%.

5. The system of claim 1, wherein at least one of the occluding devices is configured to be housed in a protective coil, a delivery device or a catheter, such that outer surfaces of the strands contact an inner surface of the protective coil, delivery device or catheter.

6. The system of claim 1, wherein at least one of the occluding devices is a 2-layer structure comprising an inner layer of strands and an outer layer of strands.

7. The device of claim 6, wherein the arc angle is calculated by dividing 360 degrees by the number of strands in the inner layer.

8. The device of claim 6, wherein the outer layer of strands contacts an inner surface of a protective coil, delivery device, or catheter, and the inner layer of strands contacts the outer layer.

9. The device of claim 1, wherein the first occluding device has a surface coverage that is less than or equal to 40%.

10. The device of claim 9, wherein the second occluding device has a surface coverage that is less than or equal to 40%.

11. A system comprising:

a first occluding device comprising a first number of strands of helically-wound material in a lattice structure arranged as a flexible tubular body, wherein the first occluding device comprises a first cross-sectional diameter, wherein each said strand of the first occluding device is circumferentially spaced from an adjacent said strand of the first occluding device by a first arc angle calculated by dividing 360 degrees by the first number of strands, wherein each said strand of the first occluding device comprises a strand width; and

a second occluding device comprising a second number of strands of helically-wound material in a lattice structure arranged as a flexible tubular body, wherein the second occluding device comprises a second cross-sectional diameter different than the first cross-sectional diameter, wherein each said strand of the second occluding device is circumferentially spaced from an adjacent said strand of the second occluding device by a second arc angle calculated by dividing 360 degrees by the second number of strands, wherein each said strand of the second occluding device comprises the strand width.

12. The system of claim 11, wherein the first number of strands is 48, and the second number of strands is 32 or 64.

13. The device of claim 11, wherein the helically-wound material for at least one of the occluding devices comprises a picks-per-inch of 65, 130 or 260.

14. The system of claim 11, wherein the first and second strand widths have maximum values that have a tolerance of 20%.

15. The system of claim 11, wherein at least one of the occluding devices is configured to be housed in a protective coil, a delivery device or a catheter, such that outer surfaces of the strands contact an inner surface of the protective coil, delivery device or catheter.

16. The system of claim 11, wherein at least one of the occluding devices is a 2-layer structure comprising an inner layer of strands and an outer layer of strands.

17. The device of claim 16, wherein the arc angle is calculated by dividing 360 degrees by the number of strands in the inner layer.

18. The device of claim 16, wherein the outer layer of strands contacts an inner surface of a protective coil, delivery device, or catheter, and the inner layer of strands contacts the outer layer.

19. The device of claim 11, wherein the first occluding device has a surface coverage that is less than or equal to 40%.

20. The device of claim 19, wherein the second occluding device has a surface coverage that is less than or equal to 40%.