Method of coating a stent having variable drug release rate

• US 8,367,149 B2
• Filed: 09/21/2010
• Issued: 02/05/2013
• Est. Priority Date: 11/12/2002
• Status: Expired due to Fees

• Current Assignee: Advanced Cardiovascular Systems Incorporated
• Original Assignee: Advanced Cardiovascular Systems Incorporated
• Inventors: Santos, Veronica J., Prabhu, Santosh
• Primary Examiner(s): Meeks, Timothy
• Assistant Examiner(s): SELLMAN, CACHET I
• Application Number:
  US12/887,311
• Publication Number:
  US 20110008528A1
• Time in Patent Office: 868 Days
• Field of Search: 427/2.1, 427/2.24, 427/2.25, 623/1.1, 623/1.39, 623/1.4, 623/1.42, 623/1.46
• US Class Current: 427/2.24
• 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

A method of coating a stent may comprise applying a composition including a drug and a polymer to the stent to form a coating. The release rate of the drug from the coating gradually increases along a length of the stent which extends axially from opposite ends of the stent. The variable drug release rate can be accomplished by varying the coating thickness, by applying a barrier region over the drug-containing composition, and/or by having different polymers in the coating, the polymers having different drug permeabilities.

Claims

1. A method of coating a stent, comprising:

applying a composition including a drug and a polymer to the stent to form a coating, wherein the release rate of the drug from the coating gradually increases along a length of the stent, the length extending axially from opposite ends of the stent.

2. The method of claim 1, wherein the composition is applied so that a thickness of the coating decreases along the length of the stent.

3. The method of claim 2, wherein the thickness of the coating is varied along the length of the stent by masking portions of the stent during the applying of the composition.

4. The method of claim 1, further comprising applying to the stent a barrier region over the composition, the barrier region is applied so that the thickness of the barrier region decreases along the length of the stent.

5. The method of claim 1, wherein the coating comprises different polymers having different drug permeabilities along the length of the stent.