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    • 20. 发明授权
    • Osmotically driven syringe
    • 渗透式注射器
    • US5030216A
    • 1991-07-09
    • US451476
    • 1989-12-15
    • Felix TheeuwesPatrick S. L. Wong
    • Felix TheeuwesPatrick S. L. Wong
    • A61K9/00A61K9/22A61M5/145
    • A61K9/0024A61K9/0004A61M5/145A61M2005/14513
    • An implantable osmotically driven syringe is disclosed which can be used to deliver a beneficial agent, such as a drug, at a predetermined rate over an extended period of time. A movable piston divides the syringe into a beneficial agent-containing compartment and a driving compartment. The piston is movable into a position wherein the driving compartment has a volume of essentially zero. The syringe is driven by an osmotic engine which has a shaped wall surrounding, and in contact with, an osmotic solute. The wall is comprised of a semipermeable and/or microporous material which is permeable to the external fluid (e.g., water) but is impermeable to the solute. The engine also has a passageway forming a fluid flow path between the osmotic solute and the driving compartment. A portion of the wall is exposed to a fluid-containing external environment. At least about 30% of the wall which contacts the solute also is exposed to the fluid in the external environment. In operation, water from the external environment is imbided through the semipermeable wall forming a solution of the solvent in the osmotic engine. As fresh incoming fluid from the external environment is imbided by the engine, the solution is pumped through the passageway into the driving compartment. The pumping action drives the piston which causes the beneficial agent to be delivered by the syringe.
    • 公开了一种可植入的渗透驱动的注射器,其可以用于在延长的时间段内以预定的速率递送诸如药物的有益剂。 可移动活塞将注射器分成含有益剂的隔室和驱动室。 活塞可移动到驱动室具有基本为零的体积的位置。 注射器由渗透引擎驱动,渗透引擎具有围绕并与渗透性溶质接触的成形壁。 该壁由半透性和/或微孔材料构成,其可渗透外部流体(例如水),但对溶质是不可渗透的。 发动机还具有在渗透性溶质和驱动室之间形成流体流路的通路。 壁的一部分暴露于含流体的外部环境中。 接触溶质的壁的至少约30%也暴露于外部环境中的流体。 在操作中,来自外部环境的水通过形成溶剂在渗透引擎中的溶液的半透壁渗透。 当来自外部环境的新鲜流体被发动机吸入时,溶液被泵送通过通道进入驱动室。 抽吸作用驱动活塞,其导致有益剂被注射器递送。