Stent Having Controlled Porosity for Improved Ductility

• US 20080208352A1
• Filed: 02/27/2007
• Published: 08/28/2008
• Est. Priority Date: 02/27/2007
• Status: Abandoned Application

• Current Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Original Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Inventors: Birdsall, Matthew J., Allen, Jeffrey, Krivoruchko, Michael
• Application Number:
  US11/679,426
• Publication Number:
  US 20080208352A1
• Time in Patent Office: Days
• US Class Current: 623/23.7
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2250/0023 differing in porosity
• CPC Class Codes: A61L 31/022 Metals or alloys
• CPC Class Codes: A61L 31/146 Porous materials, e.g. foams or sponges

Abstract

An endoluminal prosthesis for placement in a body lumen of a metallic material having controlled porosity for improved ductility. The metallic material may be formed into a stent structure or a wire or sheet, which may then be formed into the stent structure. The porous network of the stent includes pores that range from nanometer scale to micron scale. The controlled porosity accommodates volume changes as well as provides a barrier to crack propagation to allow alloy steels and amorphous metal materials, which would otherwise be considered too brittle for the demands of intraventional use, to be utilized in a stent.

Claims

1. An endoluminal prostheses for placement in a body lumen comprising:

a stent of a metallic material having controlled porosity with pores in a range of 10 nm to 10 μ

m, wherein the metallic material is an amorphous metal alloy and the controlled porosity of the amorphous metal alloy provides ductility to the stent.

2. The endoluminal prosthesis of claim 1, wherein the amorphous metal alloy includes at least one of iridium, magnesium and zinc.

3. The endoluminal prosthesis of claim 1, wherein the controlled porosity is throughout a thickness of the stent.

4. The endoluminal prosthesis of claim 1, wherein the controlled porosity is in an outer half of a thickness of the stent.

5. The endoluminal prosthesis of claim 1, wherein the controlled porosity is in an outer quarter of a thickness of the stent.

6. An endoluminal prostheses for placement in a body lumen comprising:

a stent of a metallic material having controlled porosity with pores in a range of 10 nm to 10 μ

m, wherein the metallic material is an alloy steel and the controlled porosity of the alloy steel provides ductility to the stent.

7. The endoluminal prosthesis of claim 6, wherein the alloy steel is selected from a group consisting of MP35N or other nickel-cobalt-chromium-molybdenum alloy, a cobalt-based steel alloy, an L605 alloy, and a 316L stainless steel alloy.

8. The endoluminal prosthesis of claim 6, wherein the controlled porosity is throughout a thickness of the stent.

9. The endoluminal prosthesis of claim 6, wherein the controlled porosity is in an outer half of a thickness of the stent.

10. The endoluminal prosthesis of claim 6, wherein the controlled porosity is in an outer quarter of a thickness of the stent.