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OSMOTICALLY POWERED AGENT DISPENSING DEVICE WITH FILLING MEANS

  • US 3,760,984 A
  • Filed: 09/29/1971
  • Issued: 09/25/1973
  • Est. Priority Date: 09/29/1971
  • Status: Expired due to Term
First Claim
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1. An osmotic dispenser for dispensing an active agent, wherein said dispenser comprises:

  • a. an inner wall formed of a flexible material essentially impermeable to solute and external fluid, the wall surrounding and forming, b. a compartment defined by the inner surface of the wall as a means for housing an active agent, c. a layer of an osmotically effective solute deposited on the inner wall'"'"''"'"'s outer surface, said solute capable of exhibiting an osmotic pressure gradient against an external fluid when the dispenser is positioned in the environment of use, d. an outer wall surrounding the layer of solute, said outer wall formed of a material having shape retaining properties and at least a part of the wall is permeable to external fluid and impermeable to solute, e. a dispensing passageway communicating with the compartment and the exterior of the device for dispensing an agent from the device, f. a filling passageway communicating with the exterior of the device and the compartment as a means for charging agent into the compartment, g. a means positioned in the filling passageway for closing the passageway, said means formed of a material that automatically closes after agent is charged into the compartment through the filling passageway.

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