US5891191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cobalt-chromium-molybdenum alloy stent and stent-graft
Assignee: Boston Scientific Scimed Inc
•
Filing: 1996-04-30
•
Granted: 1999-04-06
•
Expires: 2016-04-30
Abstract
Abstract A self-expanding stent formed of helically wound and braided filaments of wrought cobalt, chromium and molybdenum alloy containing less than about five weight percent nickel. The composition of the alloy from which one embodiment of the stent is formed is Co-26Cr-6Mo-1Si-1Fe-1Mn-1Ni.
Inventors
- 👤 Jonathan S. Stinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:22
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/82; A61F2/86; A61F2/90; A61L; A61L31/00; A61L31/02; A61L31/022; A61F2210/00; A61F2210/0076
Claims Analysis
Total Claims: 50
Claim 1
Independent Claim
68 words
An implantable stent or stent graft medical device comprised of a tubular and radially expandable structure including at least one elongate element having a diameter between about 0.025 mm and about 0.500 mm and formed of cobalt, chromium and molybdenum (Co-Cr-Mo) alloy containing cobalt as a primary element, chromium as a secondary element and molybdenum as a ternary element and containing less than about 5 weight percent nickel.
Claim 2
Dependent Claim
68 words
An implantable stent or stent graft medical device comprised of a tubular and radially expandable structure including at least one elongate element having a diameter between about 0.025 mm and about 0.500 mm and formed of cobalt, chromium and molybdenum (Co-Cr-Mo) alloy containing cobalt as a primary element, chromium as a secondary element and molybdenum as a ternary element and containing less than about 5 weight percent nickel.
Claim 3
Dependent Claim
18 words
The medical device of claim 1 wherein the Co-Cr-Mo alloy contains less than about 2 weight percent nickel.
Claim 4
Dependent Claim
19 words
The medical device of claim 1 wherein the Co-Cr-Mo alloy contains a maximum of about 1 weight percent nickel.
Claim 5
Dependent Claim
32 words
The medical device of claim 1 wherein the Co-Cr-Mo alloy contains between about 0 and about 0.25 weight percent nitrogen (N), and between about 0 and about 0.35 weight percent carbon (C).
Claim 6
Dependent Claim
31 words
The medical device of claim 4 wherein the Co-Cr-Mo alloy contains between about 0.15 and about 0.20 weight percent nitrogen (N), and between about 0.01 and about 0.10 weight percent carbon.
Claim 7
Dependent Claim
19 words
The medical device of claim 1 wherein the structure substantially consists of the at least one Co-Cr-Mo alloy element.
Claim 8
Dependent Claim
20 words
The medical device of claim 1 wherein each elongate Co-Cr-Mo element is formed of an at least 50% diameter-reduced filament.
Claim 9
Dependent Claim
24 words
The medical device of claim 1 wherein each Co-Cr-Mo element is characterized by an as drawn hardness of at least 45.5 Rockwell C Scale.
Claim 10
Dependent Claim
16 words
The medical device of claim 8 wherein each Co-Cr-Mo element is free from post-drawing heat treatment.
Claim 11
Dependent Claim
16 words
The medical device of claim 1 wherein each Co-Cr-Mo element is free from post-drawing heat treatment.
Claim 12
Dependent Claim
27 words
The medical device of claim 1 wherein the device is further comprised of a lattice structure including the at least one elongate element formed of Co-Cr-Mo alloy.
Claim 13
Dependent Claim
13 words
The medical device of claim 1 wherein the radially self-expandable structure is self-expanding.
Claim 14
Dependent Claim
43 words
The medical device of claim 1 wherein the Co-Cr-Mo alloy contains at least about 50 weight percent cobalt between about 25-31 weight percent chromium, between about 4-8 weight percent molybdenum, between about 0.15-0.20 weight percent nitrogen and between about 0.01-0.10 weight percent carbon.
Claim 15
Dependent Claim
18 words
The medical device of claim 13 wherein the Co-Cr-Mo alloy contains less than about 2 weight percent nickel.
Claim 16
Dependent Claim
19 words
The medical device of claim 14 wherein the Co-Cr-Mo alloy contains a maximum of about 1 weight percent nickel.
Claim 17
Dependent Claim
19 words
The medical device of claim 13 wherein each elongate element is formed of an at least 50% diameter-reduced filament.
Claim 18
Dependent Claim
17 words
The medical device of claim 13 wherein each Co-Cr-Mo alloy element is free from post-drawing heat treatment.
Claim 19
Dependent Claim
29 words
The medical device of claim 1 wherein the device further includes a membrane of porous material coextensive with at least a portion of the length of the expandable structure.
Claim 20
Dependent Claim
14 words
The medical device of claim 18 wherein the membrane is formed of polymeric material.
Claim 21
Dependent Claim
17 words
The medical device of claim 18 wherein each Co-Cr-Mo alloy element is free from post-drawing heat treatment.
Claim 22
Dependent Claim
27 words
The medical device of claim 13 wherein the device is further comprised of a lattice structure including the at least one elongate element formed of Co-Cr-Mo alloy.
Claim 23
Dependent Claim
13 words
The medical device of claim 13 wherein the radially self-expandable structure is self-expanding.
Claim 24
Dependent Claim
59 words
The medical device of claim 1 wherein the Co-Cr-Mo alloy contains at least about 60 weight percent cobalt, about 26 weight percent chromium, about 6 weight percent molybdenum, about 1 weight percent silicon, about 1 weight percent iron, about 1 weight percent manganese, about 1 weight percent nickel, about 0.18 weight percent nitrogen and about 0.05 weight percent carbon.
Claim 25
Dependent Claim
19 words
The medical device of claim 23 wherein each elongate element is formed of an at least 50% diameter-reduced filament.
Claim 26
Dependent Claim
15 words
The medical device of claim 23 wherein the device is free from post-drawing heat treatment.
Claim 27
Dependent Claim
29 words
The medical device of claim 23 wherein the device further includes a membrane of porous material coextensive with at least a portion of the length of the expandable structure.
Claim 28
Dependent Claim
14 words
The medical device of claim 26 wherein the membrane is formed of polymeric material.
Claim 29
Dependent Claim
15 words
The medical device of claim 27 wherein the device is free from post-drawing heat treatment.
Claim 30
Dependent Claim
24 words
The medical device of claim 23 wherein each Co-Cr-Mo element is characterized by an as drawn hardness of at least 45.5 Rockwell C Scale.
Claim 31
Dependent Claim
27 words
The medical device of claim 23 wherein the device is further comprised of a lattice structure including the at least one elongate element formed of Co-Cr-Mo alloy.
Claim 32
Dependent Claim
13 words
The medical device of claim 23 wherein the radially self-expandable structure is self-expanding.
Claim 33
Dependent Claim
105 words
An implantable stent or stent graft medical device comprising a tubular, radially compressible, axially flexible and a radially self-expandable structure including a plurality of elongate filaments having a diameter between about 0.025 mm and about 0.500 mm and formed of cobalt, chromium and molybdenum (Co-Cr-Mo) alloy containing at least about 50 weight percent cobalt as a primary element, between about 26-31 weight percent chromium as a secondary element, between about 4-8 weight percent molybdenum as a ternary element, between about 0.15-0.20 weight percent nitrogen, between about 0.01-0.10 weight percent carbon and less than about 2 weight percent nickel said plurality of elongate filaments are interwoven.
Claim 34
Dependent Claim
105 words
An implantable stent or stent graft medical device comprising a tubular, radially compressible, axially flexible and a radially self-expandable structure including a plurality of elongate filaments having a diameter between about 0.025 mm and about 0.500 mm and formed of cobalt, chromium and molybdenum (Co-Cr-Mo) alloy containing at least about 50 weight percent cobalt as a primary element, between about 26-31 weight percent chromium as a secondary element, between about 4-8 weight percent molybdenum as a ternary element, between about 0.15-0.20 weight percent nitrogen, between about 0.01-0.10 weight percent carbon and less than about 2 weight percent nickel said plurality of elongate filaments are interwoven.
Claim 35
Dependent Claim
17 words
The medical device of claim 32 wherein the Co-Cr-Mo alloy filaments are free from post-drawing heat treatment.
Claim 36
Dependent Claim
19 words
The medical device of claim 32 wherein each elongate filament is formed of an at least 50% diameter-reduced filament.
Claim 37
Dependent Claim
20 words
The medical device of claim 32 wherein the Co-Cr-Mo alloy filaments contain a maximum of about 1 weight percent nickel.
Claim 38
Dependent Claim
24 words
The medical device of claim 32 wherein each Co-Cr-Mo filament is characterized by an as drawn hardness of at least 45.5 Rockwell C Scale.
Claim 39
Dependent Claim
59 words
The medical device of claim 32 wherein the Co-Cr-Mo alloy contains at least about 60 weight percent cobalt, about 26 weight percent chromium, about 6 weight percent molybdenum, about 1 weight percent silicon, about 1 weight percent iron, about 1 weight percent manganese, about 1 weight percent nickel, about 0.18 weight percent nitrogen and about 0.05 weight percent carbon.
Claim 40
Dependent Claim
17 words
The medical device of claim 37 wherein the Co-Cr-Mo alloy filaments are free from post-drawing heat treatment.
Claim 41
Dependent Claim
19 words
The medical device of claim 37 wherein each elongate filament is formed of an at least 50% diameter-reduced filament.
Claim 42
Dependent Claim
24 words
The medical device of claim 37 and further including a plurality of elongate organic filaments interwoven with one another and the Co-Cr-Mo alloy filaments.
Claim 43
Dependent Claim
15 words
The medical device of claim 40 wherein the organic filaments are formed of polymeric material.
Claim 44
Dependent Claim
15 words
The medical device of claim 41 wherein the device is free from post-interweaving heat treatment.
Claim 45
Dependent Claim
28 words
The medical device of claim 19 wherein the membrane is formed from a plurality of elongate or organic filaments interwoven with one another and the Co-Cr-Mo alloy filaments.
Claim 46
Dependent Claim
15 words
The medical device of claim 43 wherein the device is free from post-interweaving heat treatment.
Claim 47
Dependent Claim
28 words
The medical device of claim 27 wherein the membrane is formed from a plurality of elongate or organic filaments interwoven with one another and the Co-Cr-Mo alloy filaments.
Claim 48
Dependent Claim
15 words
The medical device of claim 45 wherein the device is free from post-interweaving heat treatment.
Claim 49
Dependent Claim
105 words
An implantable stent or stent graft medical device comprising a tubular, radially compressible, axially flexible and a radially self-expandable structure including a plurality of elongate filaments having a diameter between about 0.025 mm and about 0.500 mm and formed of cobalt, chromium and molybdenum (Co-Cr-Mo) alloy containing at least about 50 weight percent cobalt as a primary element, between about 26-31 weight percent chromium as a secondary element, between about 4-8 weight percent molybdenum as a ternary element, between about 0.15-0.20 weight percent nitrogen, between about 0.01-0.10 weight percent carbon and less than about 0.5 weight percent nickel said plurality of elongate filaments are interwoven.
Claim 50
Dependent Claim
105 words
An implantable stent or stent graft medical device comprising a tubular, radially compressible, axially flexible and a radially self-expandable structure including a plurality of elongate filaments having a diameter between about 0.025 mm and about 0.500 mm and formed of cobalt, chromium and molybdenum (Co-Cr-Mo) alloy containing at least about 50 weight percent cobalt as a primary element, between about 26-31 weight percent chromium as a secondary element, between about 4-8 weight percent molybdenum as a ternary element, between about 0.15-0.20 weight percent nitrogen, between about 0.01-0.10 weight percent carbon and less than about 0.5 weight percent nickel said plurality of elongate filaments are interwoven.
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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) | 2002-04-05 | 2002-10-05 | 2003-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-04-05 | 2006-10-05 | 2007-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-04-05 | 2010-10-05 | 2011-04-06 | $7700.00 | Window Closed / Lapsed |