Tubular medical endoprostheses

• US 7,101,392 B2
• Filed: 08/08/2001
• Issued: 09/05/2006
• Est. Priority Date: 03/31/1992
• Status: Expired due to Fees

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Corporation
• Inventors: Heath, Kevin R.
• Primary Examiner(s): McDermott, Corrine
• Assistant Examiner(s): Izquierdo, David A.
• Application Number:
  US09/924,275
• Publication Number:
  US 20020035396A1
• Time in Patent Office: 1,854 Days
• Field of Search: 623/1.12, 623/1.13, 623/1.14, 623 118- 122, 623/1.27, 623/1.34
• US Class Current: 623/1.18
• CPC Class Codes: A61B 90/39 Markers, e.g. radio-opaque or breast lesions markers
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2210/0019 operated at only one temperature whilst inside or touching the human body, e.g. constrained in a non-operative shape during surgery, another temperature only occurring before the operation
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2240/001 Designing or manufacturing processes
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61L 31/022 Metals or alloys
• CPC Class Codes: A61L 31/088 Other specific inorganic materials not covered by A61L31/084 or A61L31/086
• CPC Class Codes: A61L 31/18 Materials at least partially X-ray or laser opaque
• CPC Class Codes: A61M 2025/09166 having radio-opaque features
• CPC Class Codes: A61M 25/0108 using radio-opaque or ultrasound markers
• CPC Class Codes: D04B 1/225 Elongated tubular articles of small diameter, e.g. coverings or reinforcements for cables or hoses
• CPC Class Codes: D10B 2101/20 Metallic fibres
• CPC Class Codes: D10B 2401/046 Shape recovering or form memory
• CPC Class Codes: D10B 2509/06 Vascular grafts; stents

Abstract

A tubular prosthesis device for use within the body. The device includes, a metal filament material formed of metal outer member having an exposed outer surface and a core within the extended outer member formed of a different metal than the outer member. The core is secured within and substantially enclosed by the outer member. The device can be reduced to a small size for introduction into the body lumen and expandable to a sufficiently large size to engage the wall of the body lumen. Stents formed of composite wires are shown.

Claims

1. An implantable medical stent containing a cobalt alloy, wherein the implantable medical stent includes at least first and second layers, the first layer being formed of the cobalt alloy and the second layer being formed of a material that is more dense than the cobalt alloy.

2. The implantable medical stent of claim 1, wherein the second layer is disposed inwardly of the first layer.

3. The implantable medical stent of claim 2, wherein the second material comprises a metal selected from the group consisting of tungsten, tantalum, rhenium, iridium, silver, gold, bismuth, platinum and alloys thereof.

4. The implantable medical stent of claim 2, wherein the first metal has a density of about 16 g/cc or greater.

5. The implantable medical stent of claim 2, wherein the first and second layers are coaxial.

6. The implantable medical stent of claim 2, wherein the first metal has a density of 9.9 g/cc or greater.

7. The implantable medical stent of claim 1, wherein the second material comprises a metal selected from the group consisting of tungsten, tantalum, rhenium, iridium, silver, gold, bismuth, platinum and alloys thereof.

8. The implantable medical stent of claim 1, wherein the first metal has a density of 9.9 g/cc or greater.

9. The implantable medical stent of claim 1, wherein the first metal has a density of about 16 g/cc or greater.

10. The implantable medical stent of claim 1, wherein the first and second layers are coaxial.