It relates to a device comprising (a) a core comprising polyurethane; (b) a sheath comprising ethylene vinyl acetate copolymer, said sheath substantially or completely surrounding said core; and (c) one or more active pharmaceutical ingredients dissolved or dispersed in said core and/or said sheath; and to a process for its preparation.本發明係關於一種裝置,其包含(a)包含聚胺基甲酸酯之核心;(b)包含乙烯乙酸乙烯酯共聚物之外鞘,該外鞘實質上或完全圍繞該核心;及(c)一或多種溶解或分散於該核心及/或該外鞘中之活性醫藥成分;以及其製備方法。