Expulsion of material from a delivery device
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United States of America Patent
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-
Apr 27, 1999
Grant Date -
N/A
app pub date -
Sep 20, 1996
filing date -
Dec 23, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A delivery device for delivering an active substance to a patient at a predetermined time after administration comprises a male hydrogel plug engaged in the neck of a female body. An expandable excipient such as a hydrogel powder or a pharmaceutical disintegrant in powder, slug or tablet form is provided beneath the active substance. In contact with an aqueous medium, the excipient absorbs water and swells such as to rapidly expel the active substance and effectively deliver it from the device.
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