Process for the preparation of polymer-based sustained release compositions
First Claim
1. A method for preparing a composition for the sustained release of a biologically active agent, comprising the steps of:
- a) forming a mixture comprising a biologically active agent, a biocompatible polymer, and a polymer solvent;
b) removing the polymer solvent thereby forming a solid polymer/active agent matrix; and
c) annealing at least a substantial portion of the exterior surface of the polymer/active agent matrix by the application of an annealing solvent.
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Accused Products
Abstract
The invention relates to a sustained release composition and methods of forming and using said composition for the sustained release of biologically active agent. The sustained release compositions of the invention comprise a biocompatible polymer and a biologically active agent characterized by a porous center and a less porous outer layer wherein the center and outer layer consist of essentially the same materials. The sustained release compositions can be prepared by annealing at least a substantial portion of the exterior surface of a polymer/active agent matrix. The compositions which have been annealed exhibit a decrease in the release of agent over the first 24 hours following administration (i.e., reduced burst) and as a result can show an increase in the duration of sustained release thereby providing increased therapeutic benefits.
44 Citations
17 Claims
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1. A method for preparing a composition for the sustained release of a biologically active agent, comprising the steps of:
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a) forming a mixture comprising a biologically active agent, a biocompatible polymer, and a polymer solvent;
b) removing the polymer solvent thereby forming a solid polymer/active agent matrix; and
c) annealing at least a substantial portion of the exterior surface of the polymer/active agent matrix by the application of an annealing solvent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification