Composite catheter braid

• US 20050137519A1
• Filed: 12/17/2003
• Published: 06/23/2005
• Est. Priority Date: 12/17/2003
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Boismier, Dennis A.
• Granted Patent: US 7,955,313 B2
• Time in Patent Office: Days
• US Class Current: 604/19
• CPC Class Codes: A61L 29/02 Inorganic materials
• CPC Class Codes: A61L 29/10 Inorganic materials
• CPC Class Codes: A61L 29/123 having an inorganic matrix
• CPC Class Codes: A61M 25/0012 with embedded structures, e.g. coils, braids, meshes, strands or radiopaque coils
• CPC Class Codes: A61M 25/005 with embedded materials for reinforcement, e.g. wires, coils, braids
• CPC Class Codes: A61M 25/0053 having a variable stiffness along the longitudinal axis, e.g. by varying the pitch of the coil or braid

Abstract

Composite catheter braids can be formed from a plurality of filaments, some of which can include significant amounts of molybdenum. Filaments including stainless steel and other materials can be used in combination with filaments including molybdenum. Individual filaments can be composed of single metals, or can represent alloys. Composite catheter braids can be employed in intravascular catheters.

Claims

1. A catheter having a distal region and a proximal region, the catheter comprising:

a polymer layer extending from the distal region to the proximal region; and

a braid disposed in axial alignment with the polymer layer, the braid comprising at least one filament containing a substantial amount of molybdenum;

wherein the braid comprises at least about 3 metallic volume percent molybdenum.

2. The catheter of claim 1, wherein the braid comprises at least about 8 metallic volume percent molybdenum.

3. The catheter of claim 1, wherein the braid comprises about 10 metallic volume percent molybdenum.

4. The catheter of claim 1, wherein the filament comprising a substantial amount of molybdenum comprises at least about 30 weight percent molybdenum.

5. The catheter of claim 1, wherein the filament comprising a substantial amount of molybdenum comprises at least about 50 weight percent molybdenum.

6. The catheter of claim 1, wherein the filament comprising a substantial amount of molybdenum comprises about 100 weight percent molybdenum.

7. The catheter of claim 1, wherein the braid comprises two filaments each containing a substantial amount of molybdenum.

8. The catheter of claim 1, wherein the braid comprises more than two filaments each containing a substantial amount of molybdenum.

9. The catheter of claim 1, wherein the braid further comprises a plurality of filaments containing stainless steel.

10. The catheter of claim 1, wherein the braid comprises at least about 30 weight percent molybdenum.

11. The catheter of claim 1, wherein the polymer layer comprises an inner lubricious liner and the braid is disposed over the inner lubricious liner.

12. The catheter of claim 11, further comprising an outer polymer sheath disposed over the braid.

13. A composite catheter braid having a proximal end and a distal end, the braid comprising:

one or more molybdenum filaments comprising at least about 30 weight percent molybdenum;

wherein each of the one or more filaments extend from the proximal end of the braid to the distal end of the braid, and the braid comprises at least about 3 metallic volume percent molybdenum.

14. The composite catheter braid of claim 13, further comprising one or more stainless steel filaments.

15. The composite catheter braid of claim 13, wherein the one or more molybdenum filaments comprises about 100 weight percent molybdenum.

16. The composite catheter braid of claim 13, wherein the one or more molybdenum filaments comprises an alloy of molybdenum and rhenium.

17. The composite catheter braid of claim 14, wherein the one or more stainless steel filaments comprises about 100 weight percent stainless steel.

18. The composite catheter braid of claim 14, wherein the one or more stainless steel filaments comprises stainless steel alloyed with platinum.

19. The composite catheter braid of claim 14, wherein the braid comprises a pattern in which 16 first filaments are wrapped in a first direction and 16 second filaments are wrapped in a second direction.

20. The composite catheter braid of claim 19, wherein the first filaments comprise one or more molybdenum filaments and a balance of stainless steel filaments while the second filaments comprise sixteen stainless steel filaments.

21. The composite catheter braid of claim 20, wherein the first filaments each have a diameter of about 0.002 inches while the second filaments each have a diameter of about 0.001 inches.

22. The composite catheter braid of claim 21, wherein the first filaments each comprise ribbons having a cross-section of about 0.002 inches by about 0.005 inches while the second filaments each comprise ribbons having a cross-section of about 0.0005 inches by about 0.005 inches.

23. The composite catheter braid of claim 22, wherein the braid comprises about 10 metallic volume percent of molybdenum.

24. A method of forming a composite catheter braid, comprising:

providing a first filament comprising a substantial amount of molybdenum;

providing a second filament comprising stainless steel; and

weaving together the first filament and the second filament to form the composite catheter braid, the resulting composite catheter braid comprising at least about 3 metallic volume percent molybdenum.

25. The method of claim 24, wherein the first filament comprises about 30 weight percent molybdenum.

26. The method of claim 24, wherein the first filament comprises about 50 weight percent molybdenum.

27. The method of claim 24, wherein the first filament comprises about 100 weight percent molybdenum.

28. The method of claim 24, wherein the first filament comprises an alloy including molybdenum and rhenium.

29. The method of claim 24, wherein the second filament comprises about 100 weight percent stainless steel.

30. The method of claim 24, wherein the second filament comprises stainless steel alloyed with platinum.

31. The method of claim 24, wherein providing a first filament comprising a substantial amount of molybdenum comprises providing a plurality of first filaments wound in a first direction, where one or more of the plurality of first filaments comprise a filament having a substantial amount of molybdenum.

32. The method of claim 24, wherein providing a second filament comprising stainless steel comprises providing a plurality of second filaments wound in a second direction, where one or more of the plurality of second filaments comprise a filament containing stainless steel.