MicrospheresPolymersPolyglycolic AcidParticle SizeDrug CarriersDelayed-Action PreparationsDrug CompoundingNanospheresLactic AcidDrug Delivery SystemsMicroscopy, Electron, ScanningChitosanChemistry, PharmaceuticalCapsulesBiocompatible MaterialsNeedlesHolmiumPorositySurface PropertiesTechnology, PharmaceuticalGelatinHexuronic AcidsGlucuronic AcidPolyvinyl AlcoholPolystyrenesYttrium RadioisotopesAlginatesDogsRegional Blood FlowAcrylic ResinsScandiumSalixCoronary CirculationGold