Endoprosthesis with Select Ceramic and Polymer Coatings

• US 20080294236A1
• Filed: 05/23/2007
• Published: 11/27/2008
• Est. Priority Date: 05/23/2007
• Status: Abandoned Application

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Scheuermann, Torsten, Anand, Umang, Kuehling, Michael
• Application Number:
  US11/752,735
• Publication Number:
  US 20080294236A1
• Time in Patent Office: Days
• US Class Current: 623/1.15
• 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 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61L 2420/04 Coatings containing a composite material such as inorganic/organic, i.e. material comprising different phases
• CPC Class Codes: A61L 31/088 Other specific inorganic materials not covered by A61L31/084 or A61L31/086
• CPC Class Codes: A61L 31/10 Macromolecular materials
• CPC Class Codes: C23C 14/06 characterised by the coating material C23C14/0021 , C23C14/04 take precedence
• CPC Class Codes: C23C 14/08 Oxides C23C14/10 takes precedence
• CPC Class Codes: C23C 14/12 Organic material
• CPC Class Codes: C23C 14/28 by wave energy or particle radiation C23C14/32 - C23C14/48 take precedence

Abstract

An endoprosthesis, such as a stent, includes a ceramic, such as IROX, having a select morphology and composition and a polymer coating, both of which are deposited by pulsed laser deposition.

Claims

1. An endoprosthesis, comprising:

a ceramic layer,

a polymer layer, and

an interface region between the ceramic and polymer layers, the interface region composed of a composite of polymer and ceramic.

2. The endoprosthesis of claim 1 wherein the polymer material in the interface region has a different molecular weight than the polymer material in the polymer layer.

3. The endoprosthesis of claim 2 wherein the polymer material in the interface region has a lower molecular weight than the polymer material in the polymer layer.

4. The endoprosthesis of claim 3 wherein the polymer material in the interface region and the polymer material in the polymer layer have the same chemical formula.

5. The endoprosthesis of claim 1 wherein the polymer material in the interface region and the polymer material in the polymer layer have different chemical formulas.

6. The endoprosthesis of claim 1 wherein the interface region has a varying relative amount of ceramic and polymer as a function of thickness.

7. The endoprosthesis of claim 5 wherein the amount of polymer increases toward the polymer layer.

8. The endoprosthesis of claim 1 wherein the interface region has a thickness of about 10 nm to 1 μ

m.

9. The endoprosthesis of claim 1 wherein the ceramic has a globular morphology.

10. The endoprosthesis of claim 9 wherein the globular morphology has a peak height of about 20 nm or less, and a peak diameter of about 100 nm or less.

11. The endoprosthesis of claim 1 wherein the ceramic has a defined grain morphology.

12. The endoprosthesis of claim 11 wherein the defined grain morphology has a grain including a length of about 50 to 500 nm and a width of about 5 to 50 nm, and a depth of about 100 to 400 nm.

13. The endoprosthesis of claim 1 wherein the ceramic morphology of the interface region is different than the morphology of the ceramic layer.

14. The endoprosthesis of claim 13 wherein the morphology of the interface region is a defined grain morphology and the morphology of the ceramic layer is a globular morphology.

15. The endoprosthesis of claim 1 wherein the endoprosthesis is a stent including abluminal and adluminal surface regions, and wherein the ceramic layer, polymer layer, and interface region are on the abluminal surface region.

16. The endoprosthesis of claim 15 wherein the polymer layer and interface region are only on the abluminal surface region.

17. The endoprosthesis of claim 16 wherein the adluminal region includes a ceramic layer.

18. The endoprosthesis of claim 17 wherein the ceramic layer on the abluminal surface region and the ceramic layer on the adluminal surface region have substantially the same morphology.

19. The endoprosthesis of claim 18 wherein the morphology is globular.

20. The endoprosthesis of claim 17 wherein the ceramic layer on the abluminal surface region and the ceramic layer on the adluminal surface region have different morphologies.

21. The endoprosthesis of claim 20 wherein the ceramic layer on the abluminal surface region is defined grain and the ceramic layer on the adluminal surface region is globular.

22. The endoprosthesis of claim 1 wherein the ceramic is IROX.

23. The endoprosthesis of claim 1 wherein the ceramic is on a stent body formed of metal.

24. The endoprosthesis of claim 23 wherein the metal is stainless steel.

25. The endoprosthesis of claim 1 wherein the polymer includes drug.

26. An endoprosthesis, comprising:

a composite layer of polymer and ceramic, the composite layer having a thickness of about 30 to 100 nm.

27. A method of forming an endoprosthesis, comprising:

providing a substrate,

depositing a ceramic and a polymer onto said substrate by PLD, and utilizing the deposited ceramic and polymer in an endoprosthesis.

28. The method of claim 27 comprising sequentially depositing said ceramic and polymer.

29. The method of claim 28 comprising depositing ceramic before depositing polymer.

30. The method of claim 27 comprising simultaneously depositing said ceramic and polymer.

31. The method of claim 30 comprising depositing ceramic without depositing polymer prior to simultaneously depositing.

32. The method of claim 30 comprising depositing polymer without depositing ceramic after simultaneously depositing.

33. The method of claim 30 wherein applying polymer by non-PLD after simultaneously depositing polymer and ceramic.

34. The method of claim 32 comprising applying polymer by non-PLD includes applying a different polymer than the polymer in said simultaneously deposited step.

35. The method of claim 27 comprising depositing said ceramic and polymer onto said substrate in a chamber without removing said substrate from said chamber.

36. The method of claim 27 comprising alternately depositing multiple layers of ceramic and/or polymer.

37. The method of claim 27 comprising providing over said PLD-deposited polymer a polymer applied without PLD.

38. The method of claim 27 wherein said ceramic is IROX.

39. A method of forming an endoprosthesis, comprising:

providing a substrate,

depositing a ceramic onto said substrate by PLD, and

utilizing the deposited ceramic in an endoprosthesis.