US5630840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clad composite stent
Assignee: Boston Scientific Scimed Inc
•
Filing: 1995-06-07
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Granted: 1997-05-20
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Expires: 2015-06-07
Abstract
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. The composite filaments employ an intermediate barrier layer between the case and core, formed for example of tantalum, niobium or platinum. To improve compatibility, a biocompatible cover layer can surround the case. An alternative composite filament features, and a radiopaque case surrounding a structural core.
Inventors
- 👤 David W. Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:56
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/82; A61F2/86; A61F2/90; A61L; A61L31/00; A61L31/02; A61L31/022; A61L31/08; A61L31/082; A61L31/14; A61L31/18; B; B21; B21C; B21C1/00; A61F2/0077; A61F2220/00; A61F2220/0008; A61F2220/0016; A61F2240/00; A61F2240/001; A61F2250/00; A61F2250/0058; A61F2250/0096; A61F2250/0098; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00029; A61M; A61M25/00; A61M25/0009
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
104 words
A body compatible device comprising: an elongate filament substantially uniform in lateral cross-section over a length or the filament comprising an elongate core and an elongate case surrounding the core substantially over said length; and a barrier layer surrounding the core and disposed between the core and the case substantially over said length; wherein the case is constructed of a case material having a yield strength of at least 100,000 psi at 0.2 percent offset, and the core is constructed of a core material from the group consisting of: tantalum, a tantalum-based alloy, platinum, a platinum-based alloy, tungsten, a tungsten-based alloy, and combinations thereof.
Claim 2
Dependent Claim
104 words
A body compatible device comprising: an elongate filament substantially uniform in lateral cross-section over a length or the filament comprising an elongate core and an elongate case surrounding the core substantially over said length; and a barrier layer surrounding the core and disposed between the core and the case substantially over said length; wherein the case is constructed of a case material having a yield strength of at least 100,000 psi at 0.2 percent offset, and the core is constructed of a core material from the group consisting of: tantalum, a tantalum-based alloy, platinum, a platinum-based alloy, tungsten, a tungsten-based alloy, and combinations thereof.
Claim 3
Dependent Claim
25 words
The device of claim 1 wherein: said barrier layer is constructed of a material from the group consisting of: tantalum, niobium, platinum, and combinations thereof.
Claim 4
Dependent Claim
25 words
The device of claim 1 wherein: said core material comprises said tantalum-based alloy, and a tantalum-based alloy comprises tungsten at about 5-20 percent by weight.
Claim 5
Dependent Claim
13 words
The device of claim 1 wherein: said case material comprises a cobalt-based alloy.
Claim 6
Dependent Claim
13 words
The device of claim 1 wherein: said case material comprises a titanium-based alloy.
Claim 7
Dependent Claim
45 words
The device of claim 1 wherein: said core material comprises said platinum-based alloy, and the platinum alloy consists essentially of platinum and a material from the consisting of group: nickel at from 5-15 percent; iridium at from 5-50 percent; and tungsten at about 5-15 percent.
Claim 8
Dependent Claim
23 words
The device of claim 1 wherein: said core material comprises tungsten-based alloy, and the tungsten-based alloy comprises rhenium at 5-40 percent, by weight.
Claim 9
Dependent Claim
46 words
A body compatible device including a plurality of elongate filaments as defined in claim 1, wherein: said elongate filaments are helically wound in at least two oppositely directed sets of spaced apart filaments, with said sets of filaments interwoven with one another in a braided configuration.
Claim 10
Dependent Claim
106 words
A body compatible device comprising: an elongate filament substantially uniform in lateral cross-section over a length of the filament comprising an elongate core and an elongate case surrounding the core substantially over said length; and a barrier layer surrounding the core and disposed between the core and case substantially over said length; wherein the core is constructed of a core material having a linear attenuation coefficient of at least 25 cm -1 at 100 KeV, and the case is constructed of a case material, said core material being more ductile and more radiopaque than the case material, and wherein the case material comprises a titanium-based alloy.
Claim 11
Dependent Claim
106 words
A body compatible device comprising: an elongate filament substantially uniform in lateral cross-section over a length of the filament comprising an elongate core and an elongate case surrounding the core substantially over said length; and a barrier layer surrounding the core and disposed between the core and case substantially over said length; wherein the core is constructed of a core material having a linear attenuation coefficient of at least 25 cm -1 at 100 KeV, and the case is constructed of a case material, said core material being more ductile and more radiopaque than the case material, and wherein the case material comprises a titanium-based alloy.
Claim 12
Dependent Claim
25 words
The device of claim 9 wherein: said barrier layer is formed of a material from the group consisting of: tantalum, niobium, platinum, and combinations thereof.
Claim 13
Dependent Claim
23 words
The device of claim 9 wherein: said titanium-based alloy includes niobium at about 10-15 percent, and zirconium at about 10-15 percent, by weight.
Claim 14
Dependent Claim
14 words
The device of claim 11 wherein: said titanium-based alloy further includes molybdenum and tin.
Claim 15
Dependent Claim
29 words
The device of claim 9 wherein: said core material consists essentially of a material from the group consisting of: tantalum, a tantalum-based alloy, a platinum-based alloy, and combinations thereof.
Claim 16
Dependent Claim
15 words
The device of claim 13 wherein: said core material consists essentially of said platinum-based alloy.
Claim 17
Dependent Claim
47 words
A resilient, body implantible prosthesis including a plurality of elongate filaments as defined in claim 9, wherein: said elongate filaments are helically wound in at least two oppositely directed sets of spaced apart filaments with said sets of filaments interwoven with one another in a braided configuration.
Claim 18
Dependent Claim
108 words
A body compatible device comprising: an elongate filament substantially uniform in lateral cross-section over a length of the filament comprising an elongate core and an elongate case surrounding the core substantially over said length; and a barrier layer surrounding the core and disposed between the core and the case substantially over said length; wherein the core is formed of a core material comprising an essentially unalloyed tantalum and the case is formed of a case material comprising 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.
Claim 19
Dependent Claim
108 words
A body compatible device comprising: an elongate filament substantially uniform in lateral cross-section over a length of the filament comprising an elongate core and an elongate case surrounding the core substantially over said length; and a barrier layer surrounding the core and disposed between the core and the case substantially over said length; wherein the core is formed of a core material comprising an essentially unalloyed tantalum and the case is formed of a case material comprising 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.
Claim 20
Dependent Claim
23 words
The device of claim 16 wherein: said barrier layer is formed of a material from the group consisting of: tantalum, niobium, and platinum.
Claim 21
Dependent Claim
47 words
A resilient, body implantible prosthesis including a plurality of elongate filaments as defined in claim 16, wherein: said elongate filaments are helically wound in at least two oppositely directed sets of spaced apart filaments, with said sets of filaments interwoven with one another in a braided configuration.
Claim 22
Dependent Claim
110 words
A body compatible device comprising: an elongate filament substantially uniform in lateral cross-section over a length of the filament comprising an elongate core and an elongate case surrounding the core substantially over said length; and a barrier layer surrounding the core and disposed between the core and the case substantially over said length; wherein the core material comprises about 85-95 weight percent platinum and about 5-15 weight percent nickel, and the case is formed of a case material comprising 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.
Claim 23
Dependent Claim
110 words
A body compatible device comprising: an elongate filament substantially uniform in lateral cross-section over a length of the filament comprising an elongate core and an elongate case surrounding the core substantially over said length; and a barrier layer surrounding the core and disposed between the core and the case substantially over said length; wherein the core material comprises about 85-95 weight percent platinum and about 5-15 weight percent nickel, and the case is formed of a case material comprising 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.
Claim 24
Dependent Claim
25 words
The device of claim 19 wherein: said barrier layer is formed of a material from the group consisting of: tantalum, niobium, platinum, and combinations thereof.
Claim 25
Dependent Claim
14 words
The device of claim 19 wherein: said core material comprises about 10 percent nickel.
Claim 26
Dependent Claim
47 words
A resilient, body implantible prosthesis including a plurality of elongate filaments as defined in claim 19, wherein: said elongate filaments are helically wound in at least two oppositely directed sets of spaced apart filaments, with said sets of filaments interwoven with one another in a braided configuration.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-05-19 | 2000-11-18 | 2001-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-05-19 | 2004-11-18 | 2005-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-05-19 | 2008-11-18 | 2009-05-20 | $7700.00 | Window Closed / Lapsed |