Nye heteroaryloksyetylaminer, fremgangsmÕte for fremstilling av, anvendelse som medisin og farmas°ytiske blandinger inneholdende disse

摘要

The invention concerns a particulate biodegradable matrix comprising: a biodegradable and hydrophilic core with a base of a carbohydrate or polyol or polyamine matrix, cross-linked and derived in the mass by variable amounts of ionic groups; a hydrophilic polymer layer, associated to the central core by chemical, for example ionic, interaction; surface molecules or polymers grafted on the external polymer layer by covalent bonds.