Expandable medical advice for delivery of beneficial agent

摘要

A drug delivery device comprises an exterior surface; an interior surface; a plurality of openings traversing said exterior surface and said interior surface, said openings having a barrier layer (52) arranged at a radially intermediate position with respect to said exterior surface and said interior surface; at least one first therapeutic agent (62, 64) in a therapeutic layer disposed at a radially exterior position with respect to said barrier layer (52); and at least one second therapeutic agent (60) in a therapeutic layer disposed at a radially interior position with respect to said barrier layer (52).