Flexible medical devices including metallic films

• US 8,632,580 B2
• Filed: 12/29/2004
• Issued: 01/21/2014
• Est. Priority Date: 12/29/2004
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Molaei, Masoud, Leynov, Alexander, Obara, Robert Z.
• Primary Examiner(s): Isabella, David
• Assistant Examiner(s): Woznicki, Jacqueline
• Application Number:
  US11/025,158
• Publication Number:
  US 20060142845A1
• Time in Patent Office: 3,310 Days
• Field of Search: 623/1.22, 623/1.53, 623/1.39, 623/1.13, 623 115- 116, 623 118- 119, 623/1.32, 623/1.51
• US Class Current: 623/1.13
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/88 the wire-like elements formed as helical or spiral coils forming a net-like or mesh-like structure A61F2/90
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• 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: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped

Abstract

Medical devices, such as endoprostheses, and methods of making the devices are disclosed. The medical device can include a stent body and a cover including a deposited metallic film. The medical device can be delivered using a delivery device along a tortuous body passage to a treatment site without damaging the medical device, delivery device, or the body passage. In some cases, the stent body is a flexible helical stent body, which may be threaded through one or more fenestrations of the cover. The cover may include longitudinally extending slits or seams, which help the cover to pass through small radii passages without buckling.

Claims

1. An endoprosthesis defining a longitudinal axis and configured to have a radially compacted state within a delivery device and a radially expanded state when deployed within a body passage, the endoprosthesis comprising:

a metallic film having a thickness of about 50 μ

m or less, the metallic, film comprising a plurality of first apertures and a plurality of second apertures, the first and second apertures respectively oriented generally perpendicular to one another,

wherein each first aperture is configured to (a) define an opening when the delivery device is in the radially compacted state and (b) define a substantially closed slit when the delivery device is in the radially expanded state, and wherein each second aperture is configured to (a) define a substantially closed slit when the delivery device is in the radially compacted state and (b) define an opening, when the delivery device is in the radially expanded state.

2. The endoprosthesis of claim 1, wherein the metallic film comprises nickel and titanium.

3. An endoprosthesis according to claim 1, wherein the metallic film comprises a tertiary alloy comprising nickel, titanium, and an additive in an amount between 0.2% and 20% by weight of the

4. An endoprosthesis according to claim 3, wherein the additive is chromium.

5. The endoprosthesis according to any claim 1, wherein the metal film is formed of a super-elastic or pseudo-elastic alloy.

6. An endoprosthesis according to claim 1, wherein the metallic film has a thickness of about 4 -35μ

m.

7. The endoprosthesis according to claim 1, further comprising radiopacity markers,

8. The endoprosthesis of claim 1, wherein the metallic film is deposited on a helical stent body.

9. The endoprosthesis of claim 1 wherein the endoprosthesis has a shape selected from:

conical, oblate, branched, and having one closed end.