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A novel drug delivery microsystem is proposed in this paper, which consists of the microstructure for drug loading and the bonding membrane with microholes for release rate controlling. The forming process of microstructure by hot embossing method was researched. For the microstructure was fabricated by degradable polymer which possess the viscoelastic property, the numerical material model was established based on the generalized Maxwell model with 5 units, and the relaxation parameters in this model were confirmed by the stress relaxation experiment. The simulation results show that the model is reasonable and give the base for the optimum parameters research by hot embossing.

The Model of Degradable Polymer PLGA Deformed by Hot Embossing Method