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Drug delivery particle

  • US 7,462,366 B2
  • Filed: 08/30/2002
  • Issued: 12/09/2008
  • Est. Priority Date: 03/29/2002
  • Status: Expired due to Fees
First Claim
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1. A drug delivery device comprising:

  • a substantially spherical polymer particle comprising polyvinyl alcohol and having a first region including pores having a first predominant pore size and containing therapeutic agent, and a second region substantially surrounding the first region and including pores having a second predominant pore size,wherein the second predominant pore size is from about 50% to about 70% of the first predominant pore size.

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