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EP0010876A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Osmotically driven active agent dispenser

Assignee: Alza Corp
•
Filing: 1979-10-04
•
Granted: —
•
Expires: 1999-10-04
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Abstract

Abstract An osmotically driven dispenser (10) for dispensing an osmotically effective active agent composition (17) into a water containing environment comprising a water insoluble two layer laminated wall of an inner semipermeable lamina (14) and an outer microporous or hydrogel lamina (12), the wall defining an inner compartment (16), an osmotically effective active agent composition (17) contained within the compartment (16), and an outlet passageway (15) through the wall from which the active agent composition (17) is dispensed characterized in that the wall includes a third layer (13) of a water soluble composition located between the inner semipermeable lamina (14) and the outer microporous or hydrogel lamina (12) and the passageway (15) extends through the inner semipermeable lamina (14) from the compartment (16) to the third layer (13).

Inventors

  • 👤 Atul D. Ayer
  • 👤 Felix Theeuwes

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-23 02:44
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0002; A61K9/0004; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31536

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 111 words
An osmotically driven dispenser for dispensing an osmotically effective active agent composition into a water containing environment comprising a water insoluble two layer laminated wall of an inner semipermeable lamina and an oter microporous or hydrogel lamina, the wall defining an inner compartment, an osmotically effective active agent composition contained within the compartment, and an outlet passageway through the wall from which the active agent composition is dispensed characterized in that the wall includes a third layer of a water soluble composition located between the inner semipermeable lamina and the outer microporous or hydrogel lamina and the passageway extends through the inner semipermeable lamina from the compartment to the third layer.
Claim 2
Dependent Claim 111 words
An osmotically driven dispenser for dispensing an osmotically effective active agent composition into a water containing environment comprising a water insoluble two layer laminated wall of an inner semipermeable lamina and an oter microporous or hydrogel lamina, the wall defining an inner compartment, an osmotically effective active agent composition contained within the compartment, and an outlet passageway through the wall from which the active agent composition is dispensed characterized in that the wall includes a third layer of a water soluble composition located between the inner semipermeable lamina and the outer microporous or hydrogel lamina and the passageway extends through the inner semipermeable lamina from the compartment to the third layer.
Claim 3
Dependent Claim 22 words
The osmotically driven dispenser of claim 1 further characterized in that the third layer is made of a carbohydrate or a salt.

References Cited (Backward Citations)

DE2201533A1 Cited
US3995631A Cited
US4034756A Cited
US4058122A Cited
US4116241A Cited
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US4111203A Cited
DE2814709A1 Cited
US4160452A Cited

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