Hypodermic syringe
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United States of America Patent
Stats
-
Aug 18, 1992
Grant Date -
N/A
app pub date -
Jul 24, 1990
filing date -
Jul 27, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hypodermic-syringe assembly comprises a hard tubular body centered on an axis and having an axial front end formed with a radially inwardly projecting annular ridge and an axial rear end, a piston axially slidable in the body and normally adjacent the rear end, and a soft plug fitted in the front end in tight engagement with the ridge. The plug is formed with an axially rearwardly open blind passage having a front floor, and a front face defining with the passage floor a relatively thin membrane. Thus a needle can be poked through the membrane.
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