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Delivery system comprising kinetic forces

  • US 5,499,979 A
  • Filed: 03/10/1994
  • Issued: 03/19/1996
  • Est. Priority Date: 06/25/1987
  • Status: Expired due to Term
First Claim
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1. A dispenser for delivering a drug to an environment comprising a fluid, the dispenser comprising:

  • (a) a housing;

    (b) an inlet in the housing;

    (c) an outlet in the housing;

    (d) a plurality of longitudinally aligned layers in the housing comprising;

    (e) a drug formulation layer, which drug formulation layer erodes over time when moved by the gas pressure to a contacting fluid at the outlet of the dispenser,(f) an inert formulation layer in contacting arrangement with the drug formulation layer, which inert formulation layer is a means for enabling the drug formulation layer to be delivered as a unit dose over time to the environment; and

    ,(g) a gas generating formulation layer in the housing for generating a gas pressure for moving the drug formulation layer and the inert formulation layer out of the dispenser at a rate that is solely governed by the rate of fluid that enters the housing and the gas generated, said gas generating formulation layer positioned at the inlet in the housing for receiving fluid that enters the dispenser.

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