Osmotic delivery system having space efficient piston
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United States of America Patent
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Apr 8, 2003
Grant Date -
N/A
app pub date -
Dec 27, 1999
filing date -
Dec 31, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
An osmotic delivery system having a space efficient piston. The capsule has an interior holding the piston, a beneficial agent, and an osmotic agent. 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 moveable seal separates the osmotic agent from the beneficial agent. The piston has a recess that receives at least a portion of the osmotic agent. The osmotic agent 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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