US20040062676A1 - Alloy for use as stents - Google Patents
Alloy for use as stents Download PDFInfo
- Publication number
- US20040062676A1 US20040062676A1 US10/446,570 US44657003A US2004062676A1 US 20040062676 A1 US20040062676 A1 US 20040062676A1 US 44657003 A US44657003 A US 44657003A US 2004062676 A1 US2004062676 A1 US 2004062676A1
- Authority
- US
- United States
- Prior art keywords
- alloys
- alloy
- stents
- tantalum
- accordance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/02—Alloys based on vanadium, niobium, or tantalum
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/02—Inorganic materials
- A61L31/022—Metals or alloys
Definitions
- the invention concerns alloys composed essentially of niobium (Nb), tantalum (Ta) and zirconium (Zr) for use as stents, as well as stents made of these alloys.
- Stents are well known in themselves and are described, for example, in U.S. Pat. No. 5,628,787, U.S. Pat. No. 5,630,840, and EP-A-0 873 734. Alloys that have been proposed for stents include not only special steels, but also nickel and tantalum alloys and niobium-zirconium alloys, in which the Nb content is greater than 90% and preferably greater than 95% or 98% (WO 02/43,787).
- the object of the present invention is to provide alloys that satisfy stringent requirements with respect to biocompatibility, contain no known allergens, have good mechanical properties, are visible in radiographs, and can be identified in nuclear spin tomography.
- stents made of the alloys of Nb, Ta, and Zr that are described below have the following combination of properties: good biocompatibility with very good mechanical properties, x-ray opacity, and identifiability in nuclear spin tomograms due to their magnetic properties. Alloy components that could cause problems, such as nickel, are absent, the x-ray opacity is not overly great as in the case of alloys with a very high Ta content, and identifiability with the nuclear spin method is an important advantage in view of the increasingly widespread use of this method.
- the niobium content is greater than 50% and preferably greater than 80%, and the rest of the alloy consists essentially of Ta and Zr.
- the Zr content is less than 5%, and the zirconium content is generally less than the tantalum content.
- the niobium content is preferably less than 90%.
- Preferred alloys have the following contents: 1. 50-98.9% Nb, 0.5-5% Zr, 0.6-49.5% Ta; 2. 90-98.9% Nb, 0.5-5% Zr, 0.6-9.5% Ta; 3. 80-97% Nb, 2-5% Zr, 1-18% Ta; 4. 80-90% Nb, 0.5-5% Zr, 5-19.5% Ta.
- Alloys with a niobium content of 80-90% are especially preferred.
- the increase in x-ray opacity and improvement of the mechanical properties work out favorably here—with the possibility of reducing the cross section of the mesh links of the stent.
- the invention also concerns stents made of the alloys described above, especially stents in which the mesh links have a relatively small cross section.
- alloys and stents made of the alloys are produced by common methods with which experts are familiar.
Abstract
Alloys for use as stents which consist essentially of niobium (Nb), tantalum (Ta) and zirconium (Zr).
Description
- The invention concerns alloys composed essentially of niobium (Nb), tantalum (Ta) and zirconium (Zr) for use as stents, as well as stents made of these alloys.
- Stents are well known in themselves and are described, for example, in U.S. Pat. No. 5,628,787, U.S. Pat. No. 5,630,840, and EP-A-0 873 734. Alloys that have been proposed for stents include not only special steels, but also nickel and tantalum alloys and niobium-zirconium alloys, in which the Nb content is greater than 90% and preferably greater than 95% or 98% (WO 02/43,787).
- The object of the present invention is to provide alloys that satisfy stringent requirements with respect to biocompatibility, contain no known allergens, have good mechanical properties, are visible in radiographs, and can be identified in nuclear spin tomography.
- Surprisingly, it was found that stents made of the alloys of Nb, Ta, and Zr that are described below have the following combination of properties: good biocompatibility with very good mechanical properties, x-ray opacity, and identifiability in nuclear spin tomograms due to their magnetic properties. Alloy components that could cause problems, such as nickel, are absent, the x-ray opacity is not overly great as in the case of alloys with a very high Ta content, and identifiability with the nuclear spin method is an important advantage in view of the increasingly widespread use of this method.
- The niobium content is greater than 50% and preferably greater than 80%, and the rest of the alloy consists essentially of Ta and Zr. The Zr content is less than 5%, and the zirconium content is generally less than the tantalum content. In addition, the niobium content is preferably less than 90%.
- Preferred alloys have the following contents:
1. 50-98.9% Nb, 0.5-5% Zr, 0.6-49.5% Ta; 2. 90-98.9% Nb, 0.5-5% Zr, 0.6-9.5% Ta; 3. 80-97% Nb, 2-5% Zr, 1-18% Ta; 4. 80-90% Nb, 0.5-5% Zr, 5-19.5% Ta. - Alloys with a niobium content of 80-90% are especially preferred. The increase in x-ray opacity and improvement of the mechanical properties work out favorably here—with the possibility of reducing the cross section of the mesh links of the stent.
- Alloys that contain more tantalum than zirconium are also preferred embodiments of the invention.
- The following are examples of especially preferred alloys:
5. 90% Nb, 1% Zr, 9% Ta; 6. 85% Nb, 1% Zr, 14% Ta. - The invention also concerns stents made of the alloys described above, especially stents in which the mesh links have a relatively small cross section.
- The alloys and stents made of the alloys are produced by common methods with which experts are familiar.
- Other objects and features of the present invention will become apparent from the following detailed description considered in conjunction with the accompanying drawings. It is to be understood, however, that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the invention, for which reference should be made to the appended claims. It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described therein.
Claims (10)
1. An alloy for use as stents, which is composed essentially of:
50-98.9% Nb;
0.5-5% Zr; and
0.6-49.5% tantalum.
2. An alloy in accordance with claim 1 , which is composed essentially of:
90-98.9% Nb;
0.5-5% Zr; and
0.6-9.5% Ta.
3. An alloy in accordance with claim 1 , which is composed essentially of:
80-97% Nb;
2-5% Zr; and
1-18% Ta.
4. An alloy in accordance with claim 1 , which is composed essentially of:
80-90% Nb;
0.5-5% Zr; and
5-19.5% Ta.
5. An alloy in accordance claim 1 , wherein the alloy contains more tantalum than zirconium.
6. A stent made of an alloy composed essentially of:
50-98.9% Nb;
0.5-5% Zr; and
0.6-49.5% tantalum.
7. A stent in accordance with claim 6 , wherein the alloy which is composed essentially of:
90-98.9% Nb;
0.5-5% Zr; and
0.6-9.5% Ta.
8. A stent in accordance with claim 6 , which is composed essentially of:
80-97% Nb;
2-5% Zr; and
1-18% Ta.
9. A stent in accordance with claim 6 , which is composed essentially of:
80-90% Nb;
0.5-5% Zr; and
5-19.5% Ta.
10. A stent in accordance with claim 6 , wherein the alloy contains more tantalum than zirconium.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10245516A DE10245516B4 (en) | 2002-09-27 | 2002-09-27 | Alloy for use with stents |
DE10245516.3 | 2002-09-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040062676A1 true US20040062676A1 (en) | 2004-04-01 |
Family
ID=31969711
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/446,570 Abandoned US20040062676A1 (en) | 2002-09-27 | 2003-05-28 | Alloy for use as stents |
Country Status (9)
Country | Link |
---|---|
US (1) | US20040062676A1 (en) |
EP (1) | EP1403390B1 (en) |
JP (1) | JP2004130128A (en) |
AT (1) | ATE337415T1 (en) |
CA (1) | CA2435557A1 (en) |
DE (2) | DE10245516B4 (en) |
DK (1) | DK1403390T3 (en) |
ES (1) | ES2269889T3 (en) |
PT (1) | PT1403390E (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060153729A1 (en) * | 2005-01-13 | 2006-07-13 | Stinson Jonathan S | Medical devices and methods of making the same |
US20070221300A1 (en) * | 2003-02-10 | 2007-09-27 | Jurgen Wachter | Metal alloy for medical devices and implants |
US20070276488A1 (en) * | 2003-02-10 | 2007-11-29 | Jurgen Wachter | Medical implant or device |
US20080038146A1 (en) * | 2003-02-10 | 2008-02-14 | Jurgen Wachter | Metal alloy for medical devices and implants |
US9470462B2 (en) | 2012-12-14 | 2016-10-18 | TITAN Metal Fabricators | Heat exchanger for heating hydrochloric acid pickling solution, a system and method for pickling, and a method of manufacturing steel products |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050098241A1 (en) * | 2003-11-11 | 2005-05-12 | W. C. Heraeus Gmbh & Co. Kg | Niobium-Zirconium Alloy for medical devices or their parts |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3642546A (en) * | 1970-03-04 | 1972-02-15 | Surface Technology Corp | Nitrided vanadium, columbium and tantalum base alloys |
US4799977A (en) * | 1987-09-21 | 1989-01-24 | Fansteel Inc. | Graded multiphase oxycarburized and oxycarbonitrided material systems |
US5628787A (en) * | 1993-01-19 | 1997-05-13 | Schneider (Usa) Inc. | Clad composite stent |
US5630840A (en) * | 1993-01-19 | 1997-05-20 | Schneider (Usa) Inc | Clad composite stent |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB933712A (en) * | 1958-08-14 | 1963-08-14 | Fansteel Metallurgical Corp | Alloys of columbium and tantalum |
FR1301628A (en) * | 1961-09-22 | 1962-08-17 | United Aircraft Corp | Niobium alloys with high mechanical strength at high temperatures |
CH528598A (en) * | 1967-04-12 | 1972-09-30 | Starck Hermann C Fa | Tantalum and /or niobium alloys with elements of subgroups - 3-6 prodn - for use as electrodes |
AU2001270216A1 (en) * | 2000-07-14 | 2002-01-30 | Advanced Cardiovascular Systems Inc. | Radiopaque stent composed of a binary alloy |
AU2001218611A1 (en) * | 2000-11-28 | 2002-06-11 | Fortimedix B.V. | Stent |
-
2002
- 2002-09-27 DE DE10245516A patent/DE10245516B4/en not_active Expired - Fee Related
-
2003
- 2003-05-28 US US10/446,570 patent/US20040062676A1/en not_active Abandoned
- 2003-07-18 CA CA002435557A patent/CA2435557A1/en not_active Abandoned
- 2003-09-09 ES ES03020304T patent/ES2269889T3/en not_active Expired - Lifetime
- 2003-09-09 DK DK03020304T patent/DK1403390T3/en active
- 2003-09-09 AT AT03020304T patent/ATE337415T1/en active
- 2003-09-09 EP EP03020304A patent/EP1403390B1/en not_active Expired - Lifetime
- 2003-09-09 DE DE50304720T patent/DE50304720D1/en not_active Expired - Lifetime
- 2003-09-09 PT PT03020304T patent/PT1403390E/en unknown
- 2003-09-25 JP JP2003334041A patent/JP2004130128A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3642546A (en) * | 1970-03-04 | 1972-02-15 | Surface Technology Corp | Nitrided vanadium, columbium and tantalum base alloys |
US4799977A (en) * | 1987-09-21 | 1989-01-24 | Fansteel Inc. | Graded multiphase oxycarburized and oxycarbonitrided material systems |
US5628787A (en) * | 1993-01-19 | 1997-05-13 | Schneider (Usa) Inc. | Clad composite stent |
US5630840A (en) * | 1993-01-19 | 1997-05-20 | Schneider (Usa) Inc | Clad composite stent |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070221300A1 (en) * | 2003-02-10 | 2007-09-27 | Jurgen Wachter | Metal alloy for medical devices and implants |
US20070276488A1 (en) * | 2003-02-10 | 2007-11-29 | Jurgen Wachter | Medical implant or device |
US20080038146A1 (en) * | 2003-02-10 | 2008-02-14 | Jurgen Wachter | Metal alloy for medical devices and implants |
US20100222866A1 (en) * | 2003-02-10 | 2010-09-02 | Jurgen Wachter | Metal alloy for medical devices and implants |
US8349249B2 (en) | 2003-02-10 | 2013-01-08 | Heraeus Precious Metals Gmbh & Co. Kg | Metal alloy for medical devices and implants |
US8403980B2 (en) | 2003-02-10 | 2013-03-26 | Heraeus Materials Technology Gmbh & Co. Kg | Metal alloy for medical devices and implants |
US20060153729A1 (en) * | 2005-01-13 | 2006-07-13 | Stinson Jonathan S | Medical devices and methods of making the same |
US7727273B2 (en) | 2005-01-13 | 2010-06-01 | Boston Scientific Scimed, Inc. | Medical devices and methods of making the same |
US20100228336A1 (en) * | 2005-01-13 | 2010-09-09 | Stinson Jonathan S | Medical devices and methods of making the same |
US7938854B2 (en) | 2005-01-13 | 2011-05-10 | Boston Scientific Scimed, Inc. | Medical devices and methods of making the same |
EP1838359B2 (en) † | 2005-01-13 | 2014-01-15 | Boston Scientific Limited | Medical devices comprising alloys |
US9470462B2 (en) | 2012-12-14 | 2016-10-18 | TITAN Metal Fabricators | Heat exchanger for heating hydrochloric acid pickling solution, a system and method for pickling, and a method of manufacturing steel products |
Also Published As
Publication number | Publication date |
---|---|
EP1403390A1 (en) | 2004-03-31 |
EP1403390B1 (en) | 2006-08-23 |
PT1403390E (en) | 2006-11-30 |
ATE337415T1 (en) | 2006-09-15 |
DE10245516A1 (en) | 2004-04-15 |
ES2269889T3 (en) | 2007-04-01 |
CA2435557A1 (en) | 2004-03-27 |
DE50304720D1 (en) | 2006-10-05 |
JP2004130128A (en) | 2004-04-30 |
DE10245516B4 (en) | 2004-09-30 |
DK1403390T3 (en) | 2006-09-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: W.C. HERAEUS GMBH & CO. KG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TROTZSCHEL, JENS;WACHTER, JURGEN;KRUGER, FRANK;AND OTHERS;REEL/FRAME:014123/0127 Effective date: 20030331 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |