Sustained Release Systems and Preparation Method Thereof

摘要

The present invention relates to a hydrophilic drug and &bgr;-tricalcium phosphate (&bgr;-TCP) coating on a surface area of biopolymer matrix to form a sustained release system. The present invention also provides a method for preparing a sustained release system, comprising providing a surface are of biopolymer matrix coated with a hydrophilic drug and &bgr;-TCP.