Patent US6174329B1 successfully refreshed from Google Patents.
US6174329B1
Expired / Lapsed
US
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Protective coating for a stent with intermediate radiopaque coating
Assignee: Abbott Cardiovascular Systems Inc
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Filing: 1996-08-22
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Granted: 2001-01-16
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Expires: 2016-08-22
Abstract
Abstract The invention relates to coated stents and the method of making them. A stent that is substantially radiolucent is at least partially coated with a radiopaque layer that makes the stent visible under X-ray or fluoroscopy. A protective layer is coated on the stent and the radiopaque layer to protect both from scratches, flaking, and galvanic corrosion, and to improve both blood and bio-compatability.
Inventors
- 👤 Joseph R. Callol
- 👤 John Y. Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:16
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/82; A61F2/86; A61F2/90; A61F2/91; A61L; A61L31/00; A61L31/08; A61L31/082; A61L31/14; A61L31/18; A61F2/0077; A61F2/02; A61F2/04; A61F2/06; A61F2/07; A61F2002/072; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0013; A61F2250/00; A61F2250/0058; A61F2250/0096; A61F2250/0098; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00035; A61F2310/00155
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
94 words
A stent for implanting in a body lumen, comprising: an elongated tubular body being a substantially radiolucent first metal; a radiopaque layer of a second metal different from the first metal covering at least a portion of the elongated tubular body; and a protective layer covering the elongated tubular body and radiopaque layer, the protective layer having a thickness effective to reduce the likelihood of galvanic corrosion between the elongated tubular body and the radiopaque layer and to protect the layers from mishandling; wherein the protective layer includes a polymeric or a ceramic material.
Claim 2
Dependent Claim
94 words
A stent for implanting in a body lumen, comprising: an elongated tubular body being a substantially radiolucent first metal; a radiopaque layer of a second metal different from the first metal covering at least a portion of the elongated tubular body; and a protective layer covering the elongated tubular body and radiopaque layer, the protective layer having a thickness effective to reduce the likelihood of galvanic corrosion between the elongated tubular body and the radiopaque layer and to protect the layers from mishandling; wherein the protective layer includes a polymeric or a ceramic material.
Claim 3
Dependent Claim
29 words
The stent of claim 1 , wherein the elongated tubular body is formed from a metallic material selected from the group consisting of stainless steel, nickel-titanium, tantalum, and titanium.
Claim 4
Dependent Claim
32 words
The stent of claim 1 , wherein the elongated tubular body has a wall surface, made up of a plurality of struts each having a diameter of less than about 0.004 inch.
Claim 5
Dependent Claim
39 words
The stent of claim 1 , wherein the thickness of the protective layer can vary in thickness on the elongated tubular body from about 0.01 to 25 microns and on the radiopaque layer from about 1.0 to 50 microns.
Claim 6
Dependent Claim
15 words
The stent of claim 1 , wherein the protective layer is biocompatible and blood compatible.
Claim 7
Dependent Claim
38 words
The stent of claim 1 , wherein the protective layer is formed from a polymeric material selected from the group consisting of Parylast®, Parylene, polymethylene, polycarbonate-urethane copolymer, silicone rubber, hydrogels, polyvinyl alcohol, polyvinyl acetate, polycapralactone, urethanes, and PHEMA-Acrylic.
Claim 8
Dependent Claim
26 words
The stent of claim 1 , wherein the protective layer is formed from a metallic material selected from the group consisting of titanium, tantalum, and titanium-alloy.
Claim 9
Dependent Claim
31 words
The stent of claim 1 , wherein the protective layer is formed from a ceramic material selected from the group consisting of zirconium nitrite, graphite, pyrolytic carbon, Nedox, and titanium nitrite.
Claim 10
Dependent Claim
27 words
The stent of claim 1 , wherein a second protective coating covers the protective coating to provide further protection against the electrochemical reaction that causes galvanic corrosion.
Claim 11
Independent Claim
125 words
A method for protecting a stent from the electrochemical reaction that causes galvanic corrosion, the method comprising: providing an elongated tubular body being substantially radiolucent first metal; applying a radiopaque layer of a second metal different from the first metal on at least a portion of the elongated tubular body; and applying a protective layer on the elongated tubular body and the radiopaque layer in a thickness effective to reduce the likelihood of galvanic corrosion between the elongated tubular body and the radiopaque layer and to protect the layers from mishandling; the protective layer covering all of the radiopaque layer and that portion of the elongated tubular body not covered by the radiopaque layer; wherein the protective layer includes a polymeric or a ceramic material.
Claim 12
Independent Claim
125 words
A method for protecting a stent from the electrochemical reaction that causes galvanic corrosion, the method comprising: providing an elongated tubular body being substantially radiolucent first metal; applying a radiopaque layer of a second metal different from the first metal on at least a portion of the elongated tubular body; and applying a protective layer on the elongated tubular body and the radiopaque layer in a thickness effective to reduce the likelihood of galvanic corrosion between the elongated tubular body and the radiopaque layer and to protect the layers from mishandling; the protective layer covering all of the radiopaque layer and that portion of the elongated tubular body not covered by the radiopaque layer; wherein the protective layer includes a polymeric or a ceramic material.
Claim 13
Dependent Claim
35 words
The method of claim 10 , wherein the method for applying the radiopaque layer includes dipping, painting, electroplating, evaporation, plasma vapor deposition, cathodic arc deposition, sputtering, laser welding or fusion, resistance welding and ion implantation.
Claim 14
Dependent Claim
41 words
The method of claim 10 , wherein the method for applying the protective layer includes dipping, spraying, spin coating, plasma deposition, condensation, electrostatically, electrochemically, electroplating, evaporation, plasma vapor deposition, cathodic arc deposition, sputtering, ion implantation, and use of a fluidized bed.
Claim 15
Dependent Claim
76 words
A stent for implanting in a body lumen, comprising: an elongated tubular body being a substantially radiolucent first metal; and a protective layer covering the elongated tubular body, the protective layer having radiopaque means of a second metal different from the first metal for increasing visibility under fluoroscopy, the protective layer having a thickness effective to protect against the electrochemical reaction leading to galvanic corrosion; wherein the protective layer includes a polymeric or a ceramic material.
Claim 16
Dependent Claim
76 words
A stent for implanting in a body lumen, comprising: an elongated tubular body being a substantially radiolucent first metal; and a protective layer covering the elongated tubular body, the protective layer having radiopaque means of a second metal different from the first metal for increasing visibility under fluoroscopy, the protective layer having a thickness effective to protect against the electrochemical reaction leading to galvanic corrosion; wherein the protective layer includes a polymeric or a ceramic material.
Claim 17
Dependent Claim
36 words
The stent of claim 13 , wherein the radiopaque means includes loading the protective layer material with a radiopaque agent selected from the group consisting of barium, titanium oxide, gold, or other metallic powders or particles.
Claim 18
Dependent Claim
17 words
The stent of claim 13 , wherein the protective layer is covered by a second protective layer.
Claim 19
Dependent Claim
92 words
A stent for implanting in a body lumen, comprising: an elongated tubular body being a substantially radiolucent first metal; a protective layer covering the elongated tubular body; and a radiopaque layer of a second metal different from the first metal covering at least a portion of the protective layer so that the stent is visible under fluoroscopic x-ray, the protective layer having a thickness effective to reduce the likelihood of galvanic corrosion between the radiopaque layer and the elongated tubular body; wherein the protective layer includes a polymeric or a ceramic material.
Claim 20
Dependent Claim
92 words
A stent for implanting in a body lumen, comprising: an elongated tubular body being a substantially radiolucent first metal; a protective layer covering the elongated tubular body; and a radiopaque layer of a second metal different from the first metal covering at least a portion of the protective layer so that the stent is visible under fluoroscopic x-ray, the protective layer having a thickness effective to reduce the likelihood of galvanic corrosion between the radiopaque layer and the elongated tubular body; wherein the protective layer includes a polymeric or a ceramic material.
Claim 21
Dependent Claim
98 words
A stent for implanting in a body lumen, comprising: an elongated tubular body being a substantially radiolucent first metal; a radiopaque layer of a second metal different from the first metal covering at least a portion of the elongated tubular body; and a protective layer covering at least a portion of the elongated tubular body and having a thickness effective to reduce the likelihood of galvanic corrosion between the elongated tubular body and the radiopaque layer and wherein the protest the layer is biocompatible and blood compatible; wherein the protective layer includes a polymeric or a ceramic material.
Claim 22
Dependent Claim
98 words
A stent for implanting in a body lumen, comprising: an elongated tubular body being a substantially radiolucent first metal; a radiopaque layer of a second metal different from the first metal covering at least a portion of the elongated tubular body; and a protective layer covering at least a portion of the elongated tubular body and having a thickness effective to reduce the likelihood of galvanic corrosion between the elongated tubular body and the radiopaque layer and wherein the protest the layer is biocompatible and blood compatible; wherein the protective layer includes a polymeric or a ceramic material.
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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) | 2004-01-16 | 2004-07-17 | 2005-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-01-16 | 2008-07-17 | 2009-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-01-16 | 2012-07-17 | 2013-01-16 | $7700.00 | Window Closed / Lapsed |