Osmotic device for delayed delivery of agent
First Claim
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1. A dispensing device for dispensing an active agent to a fluid environment of use, the dispensing device comprising:
- (a) a housing and a container in sliding telescoping relation with each other, the housing comprising an open end and a fluid-passing portion opposite the open end, said fluid-passing portion permitting passage of fluid into the housing, and the container comprising an open end, wherein said container open end is disposed within said housing open end to form a closed unit;
(b) an active agent formulation comprising an active agent within said container;
(c) a fluid-activating driving member within said housing, in fluid-transmitting relationship with the fluid-passing portion of the housing, said fluid-activated driving member expanding as it imbibes fluid thereby effecting separation of the housing and container of the closed unit, for providing a sharp pulsed release of the active agent formulation to the fluid environment of use; and
(d) optionally, a partition layer between the driving member and the container open end.
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Abstract
A dispenser for use in a fluid environment of use which is capable of the delivery of one or a plurality of discrete active agent-containing units in any desired delivery pattern or profile. It also can provide for the initially delayed delivery of an active agent to the environment of use and for high accuracy in the timing of delivery of the active agent.
104 Citations
10 Claims
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1. A dispensing device for dispensing an active agent to a fluid environment of use, the dispensing device comprising:
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(a) a housing and a container in sliding telescoping relation with each other, the housing comprising an open end and a fluid-passing portion opposite the open end, said fluid-passing portion permitting passage of fluid into the housing, and the container comprising an open end, wherein said container open end is disposed within said housing open end to form a closed unit; (b) an active agent formulation comprising an active agent within said container; (c) a fluid-activating driving member within said housing, in fluid-transmitting relationship with the fluid-passing portion of the housing, said fluid-activated driving member expanding as it imbibes fluid thereby effecting separation of the housing and container of the closed unit, for providing a sharp pulsed release of the active agent formulation to the fluid environment of use; and (d) optionally, a partition layer between the driving member and the container open end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification