Composite catheter braid
View Patent ↗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.
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, the filament comprising at least about 30 weight percent molybdenum;
wherein the braid comprises at least about 3 metallic volume percent molybdenum and up to about 10 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 up to about 50 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 9 , wherein the plurality of filaments containing stainless steel comprises about 100 weight percent stainless steel.
11. The catheter of claim 9 , wherein the plurality of filaments containing stainless steel comprises stainless steel alloyed with platinum.
12. The catheter of claim 9 , 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.
13. The composite catheter braid of claim 12 , 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.
14. The composite catheter braid of claim 13 , 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.
15. The composite catheter braid of claim 14 , 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.
16. The composite catheter braid of claim 15 , wherein the braid comprises about 10 metallic volume percent of molybdenum.
17. The catheter of claim 1 , wherein the polymer layer comprises an inner lubricious liner and the braid is disposed over the inner lubricious liner.
18. The catheter of claim 11 , further comprising an outer polymer sheath disposed over the braid.
19. The catheter of claim 1 , wherein the at least one filament comprises an alloy of molybdenum and rhenium.