Pre-use mixing pre-filled syringe
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United States of America Patent
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Jan 5, 2016
Grant Date -
Apr 9, 2015
app pub date -
Apr 14, 2013
filing date -
Mar 16, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A prefilled syringe of a before-use mixing type not requiring a bypass portion defined by a recessed inner surface portion of an outer cylinder, including first and second gaskets (4,5) fitted in the outer cylinder (2), and non-rotatively and complementarily shaped engagement portions (12, 13) respectively at a front end of the first gasket (4) and a rear end of the second gasket (5) to reduce the period for transferring a liquid between two chambers separated by the gaskets. During storage, the engagement portions abut each other to be kept out of engagement with each other, whereby a drug containing space is defined between the gaskets. When a liquid is transferred from a space defined on a rear side of the first gasket (4) to the drug containing space, the internal pressure of the drug containing space is prevented from being excessively increased.
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