Stent with drug coating

• US 7,666,223 B2
• Filed: 11/08/2006
• Issued: 02/23/2010
• Est. Priority Date: 11/12/2002
• Status: Active Grant

• Current Assignee: Advanced Cardiovascular Systems Incorporated
• Original Assignee: Advanced Cardiovascular Systems Incorporated
• Inventors: Santos, Veronica J., Prabhu, Santosh
• Primary Examiner(s): Isabella; David
• Assistant Examiner(s): LEVINE, JOSHUA H
• Application Number:
  US11/595,296
• Publication Number:
  US 20070055354A1
• Time in Patent Office: 1,203 Days
• Field of Search: 623/1.1, 623/1.42, 623/1.43, 623/1.14, 623/2.1
• US Class Current: 623/1.42
• 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 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2250/0068 the pharmaceutical product being in a reservoir

Abstract

Coatings for stents that include a polymer and a drug are provided. The stent'"'"'s struts are generally linear segments interrupted by a curved or bent segment that contain a drug/polymer coating wherein the concentration of the drug in the coating is greater in at least a portion of the curved or bent segment as compared to the linear segments.

Claims

1. A strut for a radially expandable stent, comprising:

generally linear segments interrupted by a curved or bent segment; and

a coating containing a drug disposed on the strut, wherein the concentration of the drug in the coating is greater in at least a portion of the curved or bent segment as compared to the linear segments wherein the concentration is the amount of drug per amount of coating.

2. The strut of claim 1, wherein the concentration of the drug is variable along the curved or bent segment, the concentration being the greatest at the vertex of the curved or bent segment.

3. The strut of claim 1, wherein the concentration of the drug in the coating gradually increases between the portion of the curved or bent segment and the linear segments.

4. The strut of claim 1, wherein the generally linear segments form a radial perimeter, there being coating segments along the radial perimeter, the concentration of the coating being higher along a selected segment among the coating segments as compared to other segments among the coating segments.

5. The strut of claim 1, wherein a thickness of the coating varies between the portion of the curved or bent segment and the linear segments.

6. The strut of claim 1, wherein the body comprises depots disposed in the stent body surface filled with the drug, the number of depots is greater in the portion of the curved or bent segment than the linear segments.

7. The strut of claim 1, wherein the body comprises depots disposed in the stent body surface filled with the drug, the volume of depots is greater in the portion of the curved or bent segment than the linear segments.

8. The strut of claim 1, wherein the surface area of the portion of the curved or bent segments is greater than the linear segments, the surface of the stent being roughened to vary the surface area between the portion of the curved or bent segment and the linear segments.

9. The strut of claim 1, wherein three of the generally linear segments meet and come together at the curved or bent segment, one of the three generally linear segments being disposed between the other two of the three generally linear segments.

10. The strut of claim 1, wherein the generally linear segments converge at a plurality of curved or bent segments, and wherein the concentration of the drug in the coating is greater in at least a portion of each of the curved or bent segments as compared to the generally linear segments.