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    • 9. 发明授权
    • Transdermal drug delivery system
    • 透皮给药系统
    • US5667798A
    • 1997-09-16
    • US477914
    • 1995-06-07
    • Robert B. RoydsJohn LimJoel D. Rosen
    • Robert B. RoydsJohn LimJoel D. Rosen
    • A61K9/70A61F13/00
    • A61K9/7084A61K9/703A61K9/7092A61M35/006
    • In a transdermal drug delivery system, encapsulation material used to coat drug granules controls the release of an active ingredient. The active ingredient is released into a water retaining matrix, which acts as a reservoir, and transdermal drug penetration is driven by the resulting concentration gradient. The delivery system is enclosed in a patch comprising a composite shell, which acts as an occlusive covering when attached to skin, thus enhancing the hydration of the skin area and fostering absorption of the drug. Visible change indicators incorporated into the system provide indicators at significant "landmarks" in the lifetime of the patch. Microcapsules used for the indicator may be formulated so that the penetration of moisture effects a color change at a time when the active ingredient is almost exhausted. This feature alerts to the user to the need for application of a replacement patch.
    • 在透皮药物递送系统中,用于包衣药物颗粒的包封材料控制活性成分的释放。 将活性成分释放到作为储存器的保水基质中,透皮药物穿透由所得浓度梯度驱动。 递送系统被封装在包括复合壳的贴片中,该复合壳当附着于皮肤时用作闭塞性覆盖物,从而增强皮肤区域的水合并促进药物的吸收。 纳入系统的可见变化指标提供了补丁生命周期中重要“地标”的指标。 用于指示剂的微胶囊可以配制成使得当活性成分几乎耗尽时,水分的渗透会影响颜色变化。 此功能可以提醒用户需要应用更换补丁。