# US 2013/0156629 A1 · Stainless steel alloys for making endoprostheses

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- Number: US 2013/0156629 A1
- Document ID: US20130156629A1
- Status: Published application
- Kind: A1
- Application number: 13/768,202
- Filed: 2013-02-15
- Published: 2013-06-20
- Earliest claimed: 2009-12-31
- Assignees: W. L. Gore & Associates, Inc.
- Inventors: Jeffrey S. Blanzy
- Web page: https://patentgrep.com/patent/US20130156629A1

## CPC

- A61F 2/07: Stent-grafts
- A61C 7/20: Arch wires (A61C7/28 takes precedence)
- A61F 2/90: characterised by a net-like or mesh-like structure
- A61F 2/9524: {Iris-type crimpers}
- A61F 2/958: Inflatable balloons for placing stents or stent-grafts
- A61L 27/042: {Iron or iron alloys}
- A61L 29/02: Inorganic materials
- A61L 31/022: {Metals or alloys}
- C21D 1/56: characterised by the quenching agents
- C21D 6/004: {containing Cr and Ni}
- C21D 9/0068: {for particular articles not mentioned below}
- C22C 38/001: {containing N}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/44: with molybdenum or tungsten
- C22C 38/58: with more than 1.5% by weight of manganese
- A61F 2/91: made from perforated sheets or tubes, e.g. perforated by laser cuts or etched holes
- A61F 2/9522: {Means for mounting a stent or stent-graft onto or into a placement instrument}
- A61F 2230/0069: cylindrical
- A61F 2240/001: Designing or manufacturing processes
- C21D 1/26: Methods of annealing
- C21D 9/08: for tubular bodies or pipes
- C21D 2211/001: Austenite
- C21D 2211/005: Ferrite
- Y10T 29/49863: with prestressing of part
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00)
- 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 (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Stainless steel alloys for fabricating endoprostheses. Endoprostheses can include a variety of devices such as staples, orthodontic wires, heart valves, filter devices, and stents, many of which devices are diametrically expandable devices.

## Claims

### Claim 1

A stainless steel alloy comprising iron, 16.0-18.0 wt % chromium, 6.0-8.0 wt % nickel, 0.8-1.2 wt % tungsten, 0.6-0.9 wt % molybdenum, 0.2-0.3 wt % nitrogen, at most 2.0 wt % manganese, at most 0.75 wt % silicon, and at most 0.03 wt % carbon.

### Claim 2 (depends on 1)

The stainless steel alloy of claim 1, further comprising phosphorus.

### Claim 3 (depends on 2)

The stainless steel alloy of claim 2, further comprising at most 0.03 wt % phosphorus.

### Claim 4 (depends on 1)

The stainless steel alloy of claim 1, further comprising sulfur.

### Claim 5 (depends on 4)

The stainless steel alloy of claim 4, further comprising at most 0.02 wt % sulfur.

### Claim 6 (depends on 1)

The stainless steel alloy of claim 1, further comprising 0.2-0.25 wt % nitrogen.

### Claim 7 (depends on 1)

The stainless steel alloy of claim 1, comprising iron, 16.0-18.0 wt % chromium, 6.0-8.0 wt % nickel, 0.8-1.2 wt % tungsten, 0.6-0.9 wt % molybdenum, 0.2-0.3 wt % nitrogen, at most 2.0 wt % manganese, at most 0.75 wt % silicon, at most 0.03 wt % carbon, at most 0.03 wt % phosphorus, and at most 0.02 wt % sulfur.

### Claim 8 (depends on 7)

The stainless steel alloy of claim 7, further comprising 0.2-0.25 wt % nitrogen.

### Claim 9 (depends on 7)

The stainless steel alloy of claim 7, consisting of iron, 16.0-18.0 wt % chromium, 6.0-8.0 wt % nickel, 0.8-1.2 wt % tungsten, 0.6-0.9 wt % molybdenum, 0.2-0.3 wt % nitrogen, at most 2.0 wt % manganese, at most 0.75 wt % silicon, at most 0.03 wt % carbon, at most 0.03 wt % phosphorus, and at most 0.02 wt % sulfur.

### Claim 10 (depends on 9)

The stainless steel alloy of claim 9, further comprising 0.2-0.25 wt % nitrogen.

### Claim 11 (depends on 1)

The stainless steel alloy of claim 1, wherein the stainless steel alloy has a volume fraction of ferrite of 50% or lower.

### Claim 12 (depends on 1)

The stainless steel alloy of claim 1, wherein the stainless steel alloy has a volume fraction of ferrite of about 11%.

### Claim 13 (depends on 1)

The stainless steel alloy of claim 1, wherein the stainless steel alloy has a volume fraction of ferrite of about 5% or less.

### Claim 14 (depends on 1)

The stainless steel alloy of claim 1, wherein the stainless steel alloy is non-magnetic

### Claim 15 (depends on 1)

The stainless steel alloy of claim 1, wherein the stainless steel alloy is a multiple phase alloy.

### Claim 16 (depends on 1)

The stainless steel alloy of claim 1, wherein the pitting resistance number of the stainless steel alloy is higher than that of 316L stainless steel.

### Claim 17 (depends on 16)

The stainless steel alloy of claim 16, wherein the pitting resistance number of the stainless steel alloy is about 5.

### Claim 18 (depends on 1)

The stainless steel alloy of claim 1, wherein the stainless steel alloy has an elastic recoil less than that of L605.

### Claim 19 (depends on 1)

The stainless steel alloy of claim 1, wherein the corrosion resistance of the stainless steel alloy is equivalent to that of 316L stainless steel.