Radiopaque markers and medical devices comprising binary alloys of titanium
First Claim
Patent Images
1. A medical device, comprising:
- an implantable body comprising a superelastic NiTi alloy;
a radiopaque marker, said radiopaque marker comprising a binary alloy of titanium and one binary element selected from platinum, palladium, rhodium, and gold, the titanium present in an amount ranging from 45 to 55 atomic percent and the balance of the binary alloy comprising said binary element, wherein the binary alloy is processed to exhibit a yield stress of about 200 ksi to about 250 ksi; and
an autogenous weld joining the radiopaque marker and the implantable body together,wherein the implantable body, the radiopaque marker, and the autogenous weld exhibit a crystalline lattice that is substantially the same, allowing Ni of the Ni—
Ti alloy and the binary element of the radiopaque marker to substitute for one another in one or more of the autogenous weld, in the implantable body adjacent to the autogenous weld, and in the radiopaque marker, andwherein the implantable body, the radiopaque marker, and the autogenous weld are substantially free of brittle intermetallic compounds such that the Ni—
Ti superelastic alloy, the radiopaque marker, and the autogenous weld each maintain similar ductility.
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Abstract
There is disclosed medical devices, such as stents, guidewires and embolic filters, comprising a binary alloy of titanium and one binary element selected from platinum, palladium, rhodium, and gold. There is also disclosed a radiopaque marker comprising the disclosed binary alloy, as well as medical devices having the radiopaque marker attached thereto. Methods of attaching the radiopaque marker to the medical devices, such as by welding, are also disclosure also disclosed.
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Citations
33 Claims
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1. A medical device, comprising:
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an implantable body comprising a superelastic NiTi alloy; a radiopaque marker, said radiopaque marker comprising a binary alloy of titanium and one binary element selected from platinum, palladium, rhodium, and gold, the titanium present in an amount ranging from 45 to 55 atomic percent and the balance of the binary alloy comprising said binary element, wherein the binary alloy is processed to exhibit a yield stress of about 200 ksi to about 250 ksi; and an autogenous weld joining the radiopaque marker and the implantable body together, wherein the implantable body, the radiopaque marker, and the autogenous weld exhibit a crystalline lattice that is substantially the same, allowing Ni of the Ni—
Ti alloy and the binary element of the radiopaque marker to substitute for one another in one or more of the autogenous weld, in the implantable body adjacent to the autogenous weld, and in the radiopaque marker, andwherein the implantable body, the radiopaque marker, and the autogenous weld are substantially free of brittle intermetallic compounds such that the Ni—
Ti superelastic alloy, the radiopaque marker, and the autogenous weld each maintain similar ductility. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 32)
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11. A stent comprising:
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an expandable or self-expanding NiTi alloy stent body; and a radiopaque marker integrally attached to said expandable or self-expanding stent body by an autogenous weld, wherein said radiopaque marker comprises a binary alloy of titanium and one binary element selected from platinum, palladium, rhodium, and gold, the titanium present in an amount ranging from 45 to 55 atomic percent and the balance of the binary alloy comprising said binary element, wherein the binary alloy is processed to exhibit a yield stress of about 200 ksi to about 250 ksi, wherein the stent body, the radiopaque marker, and the autogenous weld exhibit substantially the same crystalline lattice, allowing Ni of the Ni—
Ti alloy and the binary element of the radiopaque marker to substitute for one another in one or more of the autogenous weld, in the implantable body adjacent to the autogenous weld, and in the radiopaque marker such that the Ni—
Ti superelastic alloy, the radiopaque marker, and the autogenous weld each maintain similar ductility, andwherein the implantable body, the radiopaque marker, and the autogenous weld are substantially free of brittle intermetallic compounds such that the Ni—
Ti superelastic alloy, the radiopaque marker, and the autogenous weld each maintain similar ductility. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of fabricating a medical device comprising a radiopaque marker, said method comprising:
autogenously welding to an expandable or self-expanding NiTi alloy section of the medical device, the radiopaque marker comprising a binary alloy of titanium and one binary element selected from platinum, palladium, rhodium, and gold, the titanium present in an amount ranging from 45 to 55 atomic percent and the balance of the binary alloy comprising said binary element, the binary alloy exhibiting a cold-work induced yield stress of about 200 ksi to about 250 ksi, wherein each of the expandable or self-expanding section of the medical device, the radiopaque marker, and an autogenous weld coupling the expandable or self-expanding section of the medical device to the radiopaque marker exhibit a metallurgically compatible crystalline lattice, allowing Ni of the Ni—
Ti alloy and the binary element of the radiopaque marker to substitute for one another in one or more of the autogenous weld, in the implantable body adjacent to the autogenous weld, and in the radiopaque marker, andwherein each of the expandable or self-expanding section of the medical device, the radiopaque marker, and an autogenous weld are substantially free of brittle intermetallic compounds such that the Ni—
Ti superelastic alloy, the radiopaque marker, and the autogenous weld each maintain similar ductility.- View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 33)
Specification