ABSTRACT
OBJECTIVE:To prepare Hyaluronic acid-methyl collagen-terpolymer (HEMA-MMA-MAA)/Doxorubicin com-pound membranes-loaded tantalum stent,and to optimize the formulation. METHODS:Electrostatic self-assembly reaction was ad-opted to prepare compound membranes using metal tantalum stent as carrier,hyaluronic acid,methyl collagen and terpolymer as ex-cipients. With 1 and 30 d accumulative release rate as index,orthogonal test was used to optimize mass concentrations of hyaluron-ic acid,methyl collagen and terpolymer,and validated. The drug release behavior in vitro were investigated. RESULTS:The opti-mal formulation was as hyaluronic acid 1 mg/ml,methyl collagen 4.5 mg/ml and terpolymer 100 mg/ml. 1 and 30 d accumulative release rates of prepared tantalum stent were 7.57%(RSD=2.3%,n=3) and 84.14%(RSD=2.1%,n=3),respectively. 20 d later,dissolution rate approximated to zero level rate of drug release. CONCLUSIONS:Hyaluronic acid-methyl collagen-terpoly-mer/Doxorubicin compound membranes-loaded tantalum stent with sustained-release property is prepared successfully.