Osmotic delivery system having space efficient piston
First Claim
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1. An osmotic delivery system comprising:
- an enclosure having an interior for holding a beneficial agent, said interior having an interior surface;
an osmopolymer located in said interior;
a semipermeable body in liquid communication with said enclosure for permitting liquid to permeate through said semipermeable body to said osmopolymer; and
a piston located within said interior of said enclosure, the piston being movable with respect to said interior of said enclosure and defining a movable seal with said interior of said enclosure that separates said osmopolymer from the beneficial agent, the piston having a recess that receives a sleeve having an interior that receives at least a portion of said osmopolymer, said osmopolymer located between said piston and said semipermeable body, said osmopolymer for imbibing liquid from a surrounding environment through said semipermeable body to cause said piston to move and in turn cause delivery of said beneficial agent from said enclosure.
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Abstract
An osmotic delivery system having a space-efficient piston is provided. The enclosure has an interior holding the piston, a beneficial agent, and an osmopolymer including a tablet. The piston is movable with respect to an interior surface of the capsule, and defines a movable seal with the interior surface of the capsule. The movable seal separates the osmopolymer from the beneficial agent. The piston has a recess that receives at least a portion of the osmopolymer. The osmopolymer imbibes liquid from a surrounding environment through a semipermeable body to cause the piston to move and, in turn, cause delivery of the beneficial agent from the capsule.
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Citations
28 Claims
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1. An osmotic delivery system comprising:
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an enclosure having an interior for holding a beneficial agent, said interior having an interior surface; an osmopolymer located in said interior; a semipermeable body in liquid communication with said enclosure for permitting liquid to permeate through said semipermeable body to said osmopolymer; and a piston located within said interior of said enclosure, the piston being movable with respect to said interior of said enclosure and defining a movable seal with said interior of said enclosure that separates said osmopolymer from the beneficial agent, the piston having a recess that receives a sleeve having an interior that receives at least a portion of said osmopolymer, said osmopolymer located between said piston and said semipermeable body, said osmopolymer for imbibing liquid from a surrounding environment through said semipermeable body to cause said piston to move and in turn cause delivery of said beneficial agent from said enclosure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An osmotic delivery system comprising:
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a capsule having an interior for holding a beneficial agent, said capsule having an interior surface and a first opening; an osmopolymer located in said interior; a semipermeable body in liquid communication with said capsule for permitting liquid to permeate through said semipermeable body to said osmopolymer, said semipermeable body including a first plug located at least partially in said first opening in contact with the interior surface; and a piston located within said interior of said capsule, the piston being movable with respect to said interior surface of said capsule and defining a movable seal with said interior surface of said capsule that separates said osmopolymer from the beneficial agent, the piston having a recess that receives a sleeve having an interior that receives at least a portion of said osmopolymer, said osmopolymer located between said piston and said semipermeable body, said osmopolymer for imbibing liquid from a surrounding environment through said semipermeable body to cause said piston to move and, in turn, cause delivery of the beneficial agent from said capsule. - View Dependent Claims (19, 20, 21, 22)
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23. An osmotic delivery system comprising:
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an enclosure having an interior for holding a beneficial agent, an osmotic agent located in said enclosure, and a semipermeable body in liquid communication with said enclosure for permitting liquid to permeate through said semipermeable body to said osmotic agent; and a piston located within said enclosure, said piston defining a movable seal within said enclosure that separates said osmotic agent from said beneficial agent, said piston having a recess that receives a sleeve having an interior that receives at least a portion of said osmotic agent, said osmotic agent located between said piston and said semipermeable body, said osmotic agent for imbibing liquid from a surrounding environment through said semipermeable body to cause said piston to move and, in turn, cause delivery of the beneficial agent from said enclosure, wherein the osmotic agent consists of a semisolid or a solid. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification