Endoprosthesis

• US 8,052,745 B2
• Filed: 09/13/2007
• Issued: 11/08/2011
• Est. Priority Date: 09/13/2007
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Weber, Jan
• Primary Examiner(s): Sweet; Thomas J
• Assistant Examiner(s): IWAMAYE, ANDREW MICHAEL
• Application Number:
  US11/854,966
• Publication Number:
  US 20090076588A1
• Time in Patent Office: 1,517 Days
• Field of Search: 623/1.42, 623 143- 146
• US Class Current: 623/1.42
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• 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 2210/0004 bioabsorbable
• CPC Class Codes: A61F 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61F 2250/0043 differing in electric properties, e.g. in electrical conductivity, in galvanic properties
• CPC Class Codes: A61F 2250/0068 the pharmaceutical product being in a reservoir

Abstract

In embodiments a stent includes a stent body and a wire-form carrying a drug located along the stent body.

Claims

1. A stent comprising

a stent body defining a lumen and a stent body surface, the stent body comprising a first metal, the stent body surface defined by a luminal surface, an abluminal surface, and at least two side surfaces of the stent body, and

a wire-form formed of a second metal, said wire-form carrying a drug and passing through and located along the stent body without substantially interfering with mechanical performance of the stent body, the second metal being bioerodible and different from the first metal of the stent body, thereby to encourage galvanic corrosion of the wire-form,

the drug on the wire-form being decoupled from the stent body surface, and

delivery of the drug not being limited by geometry of the stent body or by position of the stent body surface against a vessel wall,

wherein the stent body includes passageways formed therethrough, at least one passageway having an opening in at least one side surface of the stent body and extending along the longitudinal axis of the stent body, and

wherein the wire-form passes through the passageways.

2. The stent of claim 1, wherein the wire-form has a diameter of about 20 microns or less.

3. The stent of claim 1, wherein the wire-form is substantially freely slideable through the passageways.

4. The stent of claim 1, wherein the drug is coated on the wire-form.

5. The stent of claim 4, wherein the drug is in a polymer carrier.

6. The stent of claim 5, wherein the drug is in a capsule.

7. The stent of claim 1 wherein the wire-form comprises multiple wire-forms joined together.

8. The stent of claim 7 wherein the drug is provided between individual wire-forms of the multiple wire-forms.

9. The stent of claim 1 wherein the wire-form extends beyond an end of the stent.

10. The stent of claim 1 wherein the stent includes multiple wire-form strands.

11. The stent of claim 10 wherein the density of the strands varies along the stent body.

12. The stent of claim 1 wherein the stent body is substantially free of drug.

13. The stent of claim 1 wherein the stent body includes an endothelialization-enhancing material on the stent body surface.

14. The stent of claim 13 wherein the endothelialization-enhancing material is a ceramic.

15. The stent of claim 1 wherein the drug comprises a drug release profile independent of a pattern of the stent body.

16. The stent of claim 1 further comprising an additional, coaxial stent body, the wire-form being disposed between the stent body and the additional stent body.

17. The stent of claim 1 wherein the wire-form has a diameter substantially less than a thickness of the stent body.

18. The stent of claim 17 wherein the stent body comprises a continuous tubular element formed of a metal, a polymer, or a ceramic.

19. The stent of claim 1, wherein the wire-form is magnetic.

20. The stent of claim 1, wherein the passageways are formed by an excimer laser, a UV laser, or ultrashort pulse lasers.