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Osmotic dispensing device with maximum and minimum sizes for the passageway

  • US 3,916,899 A
  • Filed: 02/07/1974
  • Issued: 11/04/1975
  • Est. Priority Date: 04/25/1973
  • Status: Expired due to Term
First Claim
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1. An osmotic device for the continuous dispensing of an active agent to an environment of use, said device comprising:

  • a. a shaped wall formed of a semipermeable material that maintains its integrity during the dispensing period and which is characterized as permeable to the passage of an external fluid in the environment of use and substantially impermeable to the passage of the active agent, the wall surrounding and forming;

    b. a compartment containing the active agent that is soluble in the external fluid, and which agent exhibits an osmotic pressure gradient across the wall against the external fluid;

    c. a passageway in the wall for dispensing agent from the device, said passageway having a maximum cross-sectional area, As, defined aS

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