Method and apparatus for inhibiting fluid loss from a syringe
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United States of America Patent
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N/A
Issued Date -
Jul 22, 2004
app pub date -
Feb 23, 2004
filing date -
Jan 7, 2002
priority date (Note) -
Abandoned
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Abstract
The present invention is directed to syringes that have needles that retract after an injection to provide safe syringes which reduce the possibility of a sharps injury through retraction of the needle after use into the barrel of the syringe. The syringe includes a barrel, a needle assembly positioned in the hollow body, a fluid retention system positioned in the hollow body, and a plunger assembly that moves in the hollow body. A fluid retention system retains in the syringe any fluid remaining in the needle after the plunger assembly approaches tha distal end of the hollow body. The fluid retention system includes a variable volume vacuum cavity in fluid communication with the needle passage, the vaccum cavity expanding prior to retraction of the needle assembly and providing a pressure drop in the needle, tending to draw into the hollow body any fluid remaining in the needle.
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