Radiopaque enhanced cobalt alloy for stents
AssigneeMedtronic Vascular, Inc.
InventorDustin Thompson
Life of this patent
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Abstract
A stent is formed of at least a cobalt-based alloy. The cobalt-based alloy may include 10-35 weight % metal member 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; 16-21 weight % chromium (Cr); 9-12 weight % molybdenum (Mo); 0-25 weight % nickel (Ni); and balance cobalt (Co). The cobalt-based alloy may be a thin outer shell of a hollow stent. The cobalt-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. The cobalt-based alloy may be used to form an end of a wire for forming a stent.
Claims9
A stent comprising:
- a cobalt-based alloy, wherein the cobalt-based alloy is free of molybdenum (Mo), the cobalt based alloy comprising
- about 14 weight % tungsten (W) and 10-14 weight % platinum (Pt);
- 20-24 weight % chromium (Cr);
- 8-12 weight % nickel (Ni);
- 0-3 weight % iron (Fe);
- and
- balance cobalt (Co).
A stent comprising:
- a plurality of struts formed by a wire, the wire comprising an outer shell substantially surrounding an inner core, wherein one of the outer shell and the inner core comprises a cobalt-based alloy and the other of the outer shell and the inner core comprises a metal member 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, the cobalt-based alloy comprising:
- 10-35 weight % the metal member;
- 16-21 weight % chromium (Cr);
- 9-12 weight % molybdenum (Mo);
- 10-18 weight % nickel (Ni);
- 0-3 weight % iron (Fe);
- and
- balance cobalt (Co).
A stent comprising:
- a cobalt-based alloy comprising
- 10-35 weight % metal member 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;
- 16-21 weight % chromium (Cr);
- 9-12 weight % molybdenum (Mo);
- 10-18 weight % nickel (Ni);
- 0-3 weight % iron (Fe);
- and
- balance cobalt (Co).
Dependencies are inferred from the claim text.