Osmotic delivery system having space efficient piston
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United States of America Patent
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-
Feb 14, 2006
Grant Date -
Apr 21, 2005
app pub date -
Oct 5, 2004
filing date -
Dec 31, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
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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