Syringe assembly having disabling mechanism with tamper resistance features
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United States of America Patent
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-
Jul 15, 2008
Grant Date -
Jan 10, 2008
app pub date -
Mar 5, 2007
filing date -
Jul 30, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A syringe assembly having passive disabling structure includes a barrel and a plunger rod assembly. The plunger rod assembly includes a plunger rod and a stopper connected by an indexing locking element. The number of strokes of the syringe plunger before the stopper is locked into the barrel rendering the syringe assembly unusable is determined by the number of detents on the plunger rod and stopper which engage the locking mechanism. Upon completion of the final delivery stroke, any attempt to withdraw the plunger rod from the barrel will cause the locking element to engage the barrel and trap the stopper in the barrel preventing further use of the syringe.
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