Stent

   
   

A stent wherein a biologically/physiologically active substance is loaded on the stent main body is provided. The active substance is gradually released for a prolonged period without being rapidly released in a short period. The stent comprises a stent main body, and a sustained release coating formed on the stent main body; wherein the coating comprises a biologically/physiologically active substance layer formed on the stent main body, and a polymer layer formed on the biologically/physiologically active substance layer; and the biologically/physiologically active substance layer comprises at least one biologically/physiologically active substance; the polymer layer comprises a vapor or water-permeable polymer, and a water-swellable substance dispersed in the polymer and swollen by absorption of the vapor or the water; and cracks are formed in the polymer layer when the water-swellable substance is swollen by absorbing the vapor or the water.

Se proporciona un stent en donde una sustancia activa de biologically/physiologically se carga en el cuerpo principal stent. La sustancia activa se lanza gradualmente por un período prolongado sin rápidamente ser lanzado en un período corto. El stent abarca un cuerpo principal stent, y una capa sostenida del lanzamiento formada en el cuerpo principal stent; en donde la capa abarca una capa de la sustancia activa de biologically/physiologically formada en el cuerpo principal stent, y una capa del polímero formaron en la capa de la sustancia activa de biologically/physiologically; y la capa de la sustancia activa de biologically/physiologically abarca por lo menos una sustancia activa de biologically/physiologically; la capa del polímero abarca un vapor o un polímero permeable al agua, y una sustancia agua-water-swellable dispersada en el polímero e hinchada por la absorción del vapor o del agua; y las grietas se forman en la capa del polímero cuando la sustancia agua-water-swellable es hinchada absorbiendo el vapor o el agua.

 
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