Radiopaque enhanced nickel alloy for stents

Patent metadata

Field	Value
Publication number	US-9339398-B2
Application number	US-201313772211-A
Country	US
Kind code	B2
Filing date	Feb 20, 2013
Priority date	Apr 26, 2012
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

A stent includes a nickel-based alloy that includes 10-35 weight % metal member selected from the group consisting of platinum (Pt), gold (Au), iridium (Ir), osmium (Os), rhenium (Re), palladium (Pd), tantalum (Ta), and combinations thereof; 0-6 weight % cobalt (Co); 17-24 weight % chromium (Cr); 13-15 weight % tungsten (W); 0-3 weight % molybdenum (Mo); 0-5 weight % iron (Fe); and balance nickel (Ni). The nickel-based alloy may be a thin outer shell of a hollow stent. The nickel-based alloy may be used to form at least one of an inner core and an outer shell of a core-shell structure of a stent.

First claim

What is claimed is:

1. A stent comprising:
a nickel-based alloy comprising
10-35 weight % metal member selected from the group consisting of platinum (Pt), gold (Au), iridium (Ir), osmium (Os), rhenium (Re), palladium (Pd), tantalum (Ta), and combinations thereof;
0-6 weight % cobalt (Co);
17-24 weight % chromium (Cr);
13-15 weight % tungsten (W);
0-3 weight % molybdenum (Mo);
0-5 weight % iron (Fe); and
balance nickel (Ni).

2. The stent of claim 1 , wherein the nickel-based alloy comprises:
10-25 weight % platinum (Pt);
4-6 weight % cobalt (Co);
17-23 weight % chromium (Cr);
13-15 weight % tungsten (W);
2-3 weight % molybdenum (Mo);
0-3 weight % iron (Fe); and
balance nickel (Ni).

3. The stent of claim 1 , wherein the nickel-based alloy is formed of
about 20 weight % platinum (Pt);
about 5 weight % cobalt (Co);
about 22 weight % chromium (Cr);
about 14 weight % tungsten (W);
about 2 weight % molybdenum (Mo);
about 3 weight % iron (Fe); and
balance nickel (Ni).

4. The stent of claim 1 , wherein the nickel-based alloy is formed of
about 21 weight % platinum (Pt);
about 5 weight % cobalt (Co);
about 18 weight % chromium (Cr);
about 13 weight % tungsten (W);
about 2 weight % molybdenum (Mo);
about 4 weight % iron (Fe); and
balance nickel.

5. The stent of claim 4 , wherein the nickel-based alloy is formed of
about 21 weight % platinum (Pt);
about 4.9 weight % cobalt (Co);
about 17.7 weight % chromium (Cr);
about 13.3 weight % tungsten (W);
about 2.2 weight % molybdenum (Mo);
about 4.4 weight % iron (Fe); and
balance nickel (Ni).

6. The stent of claim 1 , wherein the nickel-based alloy forms at least one strut of the stent.

7. The stent of claim 1 , wherein the stent comprises a core-shell structure having an outer shell substantially surrounding an inner core, and wherein at least one of the outer shell and the inner core is formed of the nickel-based alloy.

8. The stent of claim 1 , wherein the stent comprises a core-shell structure having an outer shell substantially surrounding an inner core, wherein one of the outer shell and the inner core is formed of the nickel-based alloy and the other thereof is formed of a metal member.

9. The stent of claim 8 , wherein the metal member comprises a metal selected from the group consisting of platinum (Pt), gold (Au), iridium (Ir), osmium (Os), rhenium (Re), tungsten (W), palladium (Pd), tantalum (Ta), and combinations thereof.

10. The stent of claim 1 , wherein the stent comprises a core-shell structure having an outer shell substantially surrounding an inner core, and wherein the inner core is hollow and the outer shell is formed of the nickel-based alloy having a thickness of about 0.0010 inches or less.

11. The stent of claim 1 , wherein the stent comprises a core-shell structure having an outer shell substantially surrounding an inner core comprising Ta, wherein the outer shell comprises the nickel-based alloy formed of
about 21 weight % platinum (Pt);
about 5 weight % cobalt (Co);
about 18 weight % chromium (Cr);
about 13 weight % tungsten (W);
about 2 weight % molybdenum (Mo);
about 4 weight % iron (Fe); and
balance nickel.

12. The stent of claim 1 , wherein the stent comprises a core-shell structure having an outer shell substantially surrounding an inner core comprising Ta, wherein the outer shell comprises the nickel-based alloy formed of
about 11.3 weight % platinum (Pt);
about 5.4 weight % cobalt (Co);
about 22.9 weight % chromium (Cr);
about 14.8 weight % tungsten (W);
about 2.4 weight % molybdenum (Mo);
about 3.8 weight % iron (Fe); and
balance nickel (Ni).

13. A stent comprising:
a plurality of struts formed by a wire, the wire comprising an outer shell surrounding an inner core, wherein at least one of the outer shell and the inner core comprises a nickel-based alloy, the nickel-based alloy comprising
10-35 weight % metal member selected from the group consisting of platinum (Pt), gold (Au), iridium (Ir), osmium (Os), rhenium (Re), palladium (Pd), tantalum (Ta), and combinations thereof;
0-6 weight % cobalt (Co);
17-24 weight % chromium (Cr);
13-15 weight % tungsten (W);
0-3 weight % molybdenum (Mo);
0-5 weight % iron (Fe); and
balance nickel (Ni).

14. The stent of claim 13 , wherein the outer shell comprises the nickel-based alloy, and wherein the inner core is a metal element or a metal alloy, and comprises one or more of platinum (Pt), gold (Au), iridium (Ir), osmium (Os), rhenium (Re), palladium (Pa), tungsten (W), tantalum (Ta), and a combination thereof.

15. The stent of claim 13 , wherein the inner core is hollow and the outer shell is formed of the nickel-based alloy having a thickness of 0.0010 inches or less.

16. The stent of claim 13 , wherein the outer shell comprises the nickel-based alloy formed of
about 21 weight % platinum (Pt);
about 5 weight % cobalt (Co);
about 18 weight % chromium (Cr);
about 13 weight % tungsten (W);
about 2 weight % molybdenum (Mo);
about 4 weight % iron (Fe); and
balance nickel.

17. The stent of claim 13 , wherein the outer shell comprises the nickel-based alloy formed of
about 11.3 weight % platinum (Pt);
about 5.4 weight % cobalt (Co);
about 22.9 weight % chromium (Cr);
about 14.8 weight % tungsten (W);
about 2.4 weight % molybdenum (Mo);
about 3.8 weight % iron (Fe); and
balance nickel (Ni).

Assignees

• Medtronic Vascular Inc

Inventors

• Thompson Dustin

Classifications

• C22C1/02

  by melting {(C22C1/1036 takes precedence)} · CPC title

• A61L31/18

  Materials at least partially X-ray or laser opaque · CPC title

• C22C30/00

  Alloys containing less than 50% by weight of each constituent · CPC title

• C22C19/051

  and Mo or W · CPC title

• C22F1/10

  of nickel or cobalt or alloys based thereon · CPC title