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Osmotically driven fluid dispenser

  • US 3,987,790 A
  • Filed: 10/01/1975
  • Issued: 10/26/1976
  • Est. Priority Date: 10/01/1975
  • Status: Expired due to Term
First Claim
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1. In an osmotically driven fluid dispenser comprising an inner flexible bag adapted to contain the fluid, an intermediate layer of an osmotically effective solute composition at least partly encapsulating the bag, an outer shape-retaining membrane encapsulating the layer of osmotically effective solute composition, said membrane being at least in part permeable to water, and a port that extends from the interior of the bag to the exterior of the dispenser through which the fluid may be charged into the bag and dispensed from the bag, the improvement comprising a conduit that is sized to fit snugly through the port and extending substantially into the interior of the bag after the fluid is charged into the bag.

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