OSMOTIC DEVICE WITHIN AN OSMOTIC DEVICE

摘要

The delivery devices (20) described herein are capable of delivering one or more active substances by osmotic pumping through preformed passageways (26, 27). An osmotic device according to the invention includes a first osmotic device enclosed within a second osmotic device. The first osmotic device includes drug-containing core (25) surrounded by a first semipermeable membrane (24). The second osmotic device includes a drug-containing composition (23) surrounding the first semipermeable membrane and a second semipermeable membrane (22) surrounding the drug-containing composition. The device can also include an external drug-containing composition (21). In som e embodiments, the semipermeable membrane of one or both of the osmotic device s completely dissolves or degrades during use. This delivery device can includ e an immediate release outer coat.