Medical devices including metallic films and methods for making same

• US 8,591,568 B2
• Filed: 12/29/2004
• Issued: 11/26/2013
• Est. Priority Date: 03/02/2004
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Molaei, Masoud
• Primary Examiner(s): Bui, Vy Q
• Application Number:
  US11/025,860
• Publication Number:
  US 20050197689A1
• Time in Patent Office: 3,254 Days
• Field of Search: 623/1.13, 623/1.15, 623/1.34, 623/1.42, 623 144- 146, 623/1.48, 623/1.49, 606/191, 606/194, 606/195, 606/198
• US Class Current: 623/1.13
• CPC Class Codes: A61F 2/01 Filters implantable into blood vessels
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2002/823 Stents, different from stent-grafts, adapted to cover an aneurysm
• CPC Class Codes: A61F 2220/0041 using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61L 31/022 Metals or alloys
• CPC Class Codes: C23C 16/06 characterised by the deposition of metallic material

Abstract

Medical devices, such as endoprostheses, and methods of making the devices are disclosed. The medical device can include a metallic film comprising nickel, titanium, and chromium, wherein a ratio of a weight of chromium of the metallic film to a combined weight of nickel, titanium, and chromium of the metallic film is at least 0.001. The metallic film can include a shape memory alloy.

Claims

1. An endoprosthesis, comprising:

a stent comprising a plurality of longitudinal members defining a plurality of first openings, each longitudinal member is in the form of a wire extending along a direction substantially parallel to a longitudinal axis of the stent; and

a metallic film comprising an alloy comprising nickel, titanium, and chromium, the metallic film having a thickness of about 50 μ

m or less, covering at least a portion of the stent, and occluding at least a portion of the plurality of first openings

wherein the film includes a plurality of pores having a size suitable to facilitate adhesion of cells thereto;

wherein each pore has a depth of 25 microns or less.

2. The endoprosthesis of claim 1, wherein a ratio of the weight of chromium to a combined weight of nickel, titanium, and chromium is less than 0.0075.

3. The endoprosthesis of claim 2, wherein a ratio of a combined weight of nickel and titanium a weight of the metallic film is at least 0.99.

4. The endoprosthesis of claim 1, wherein the chromium is uniformly distributed throughout the metallic film.

5. The endoprosthesis of claim 1, wherein the metallic film is a nickel, titanium, and chromium alloy.

6. The endoprosthesis of claim 1, wherein the metallic film is a vapor deposited film.

7. The endoprosthesis of claim 1, wherein the metallic film comprises about 5×

107 dislocations per cm² or more.

8. The endoprosthesis of claim 1, wherein the metallic film is attached to the stein.

9. The endoprosthesis of claim 1, wherein the metallic film comprises a plurality of second openings, each of the first openings has a first area, and each of the second openings has a second area smaller than the first area.

10. The endoprosthesis of claim 8, wherein the metallic film is attached to the stent by blazing, welding, or crimping, or the metallic film is attached to the stent by to filament, a rivet, a grommet, or an adhesive.