Clad composite stent
First Claim
1. A body compatible device comprising a hollow tubular body made of at least one elongate filament, the filament including an elongate core and an elongate case at least partially surrounding the core, wherein the case comprises a case material having a yield strength of at least 100,000 psi at 0.2% offset, and the core comprises a platinum-nickel alloy including from about 5 percent to about 15 percent nickel, by weight.
3 Assignments
0 Petitions
Accused Products
Abstract
A body compatible stent is formed of multiple filaments arranged in at least two sets of oppositely directed helical windings interwoven with one another in a braided configuration. Each of the filaments is a composite including a central core and a case surrounding the core. In the more preferred version, the core is formed of a radiopaque and relatively ductile material, e.g. tantalum or platinum. The outer case is formed of a relatively resilient material, e.g. a cobalt/chromium based alloy. Favorable mechanical characteristics of the stent are determined by the case, while the core enables in vivo imaging of the stent. The composite filaments are formed by a drawn filled tubing process in which the core is inserted into a tubular case of a diameter substantially more than the intended final filament diameter. The composite filament is cold-worked in several steps to reduce its diameter, and annealed between successive cold-working steps. After the final cold working step, the composite filament is formed into the desired shape and age hardened. Alternative composite filaments employ an intermediate barrier layer between the case and core, a biocompatible cover layer surrounding the case, and a radiopaque case surrounding a structural core.
377 Citations
24 Claims
- 1. A body compatible device comprising a hollow tubular body made of at least one elongate filament, the filament including an elongate core and an elongate case at least partially surrounding the core, wherein the case comprises a case material having a yield strength of at least 100,000 psi at 0.2% offset, and the core comprises a platinum-nickel alloy including from about 5 percent to about 15 percent nickel, by weight.
- 6. An expandable stent comprising at least one elongate filament, the filament having a case made of a case material having a yield strength of at least 100,000 psi at 0.2% offset, and a core comprising a platinum-nickel alloy including from about 5 percent to about 15 percent nickel, by weight.
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12. A body compatible device comprising a hollow tubular body made of at least one elongate filament, the filament including an elongate core and an elongate case at least partially surrounding the core;
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a) wherein the core comprises a platinum-nickel alloy and the case comprises about 30-55 weight percent cobalt, about 15-25 weight percent chromium, about 0-40 weight percent nickel, about 5-15 weight percent molybdenum, about 0-5 weight percent manganese, and about 0-25 weight percent iron; and
b) wherein the platinum-nickel alloy of the core includes from about 5 percent to about 15 percent nickel, by weight. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An expandable stent comprising at least one elongate filament including an elongate core and an elongate case at least partially surrounding the core,
a) wherein the core comprises a platinum-nickel alloy and the case comprises about 30-55 weight percent cobalt, about 15-25 weight percent chromium, about 0-40 weight percent nickel, about 5-15 weight percent molybdenum, about 0-5 weight percent manganese, and about 0-25 weight percent iron; - and
b) wherein the platinum-nickel alloy of the core includes from about 5 percent, to about 15 percent nickel, by weight. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification