US6527802B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clad composite stent
Assignee: Boston Scientific Scimed Inc
•
Filing: 1997-09-23
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Granted: 2003-03-04
•
Expires: 2017-09-23
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. 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.
Inventors
- 👤 David W. Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:14
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: 28
Claim 1
Independent Claim
70 words
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.
Claim 2
Dependent Claim
70 words
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.
Claim 3
Dependent Claim
15 words
The device of claim 1 wherein the platinum-nickel alloy comprises about 10 weight percent nickel.
Claim 4
Dependent Claim
14 words
The device of claim 1 wherein the core consists essentially of said platinum-nickel alloy.
Claim 5
Dependent Claim
12 words
The device of claim 1 wherein the case and core are contiguous.
Claim 6
Dependent Claim
22 words
The device of claim 1 comprising a plurality of elongate filaments helically wound and interwoven with one another in a braided configuration.
Claim 7
Dependent Claim
50 words
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.
Claim 8
Dependent Claim
50 words
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.
Claim 9
Dependent Claim
15 words
The stent of claim 6 wherein the platinum-nickel alloy comprises about 10 weight percent nickel.
Claim 10
Dependent Claim
14 words
The stent of claim 6 wherein the core consists essentially of said platinum-nickel alloy.
Claim 11
Dependent Claim
12 words
The stent of claim 6 wherein the case and core are contiguous.
Claim 12
Dependent Claim
12 words
The stent of claim 6 wherein the stent is adapted to self-expand.
Claim 13
Dependent Claim
22 words
The stent of claim 6 comprising a plurality of elongate filaments helically wound and interwoven with one another in a braided configuration.
Claim 14
Dependent Claim
96 words
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; 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.
Claim 15
Dependent Claim
96 words
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; 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.
Claim 16
Dependent Claim
14 words
The device of claim 12 wherein the core comprises about 85-95 weight percent platinum.
Claim 17
Dependent Claim
20 words
The device of claim 13 wherein the core comprises about 90 weight percent platinum and about 10 weight percent nickel.
Claim 18
Dependent Claim
22 words
The device of claim 12 wherein the core consists essentially of about 85-95 weight percent platinum and about 5-15 weight percent nickel.
Claim 19
Dependent Claim
12 words
The device of claim 12 wherein the case and core are contiguous.
Claim 20
Dependent Claim
22 words
The device of claim 12 comprising a plurality of elongate filaments helically wound and interwoven with one another in a braided configuration.
Claim 21
Dependent Claim
87 words
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.
Claim 22
Dependent Claim
87 words
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.
Claim 23
Dependent Claim
14 words
The stent of claim 18 wherein the core comprises about 85-95 weight percent platinum.
Claim 24
Dependent Claim
20 words
The stent of claim 19 wherein the core comprises about 90 weight percent platinum and about 10 weight percent nickel.
Claim 25
Dependent Claim
23 words
The device of claim 18 wherein the core consists of essentially of about 85-95 weight percent platinum and about 5-15 weight percent nickel.
Claim 26
Dependent Claim
12 words
The stent of claim 18 wherein the case and core are contiguous.
Claim 27
Dependent Claim
22 words
The stent of claim 18 comprising a plurality of elongate filaments helically wound and interwoven with one another in a braided configuration.
Claim 28
Dependent Claim
12 words
The stent of claim 18 wherein the stent is adapted to self-expand.
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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) | 2006-03-03 | 2006-09-02 | 2007-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-03-03 | 2010-09-02 | 2011-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-03-03 | 2014-09-02 | 2015-03-04 | $7700.00 | Window Closed / Lapsed |