Sustained release delivery system

  • US 6,335,035 B1
  • Filed: 02/28/2000
  • Issued: 01/01/2002
  • Est. Priority Date: 09/29/1995
  • Status: Expired due to Term
First Claim
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1. A sustained release delivery system, which comprises:

  • an active therapeutic drug dispersed with a polymer matrix which is solubilized or suspended in a liquid medium;

    wherein the polymer matrix consists of hyaluronic acid of salts thereof blended with a nonionic polymer selected from the group consisting of hydroxyethylcellulose, hydroxypropylcellulose and mixture thereof;

    and wherein the molar ratio of the hyaluronic acid or salts thereof to the nonionic polymers 1;

    0.5 to 2.0.

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