Spring powered needle-free injection system
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United States of America Patent
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-
Oct 28, 2008
Grant Date -
Jun 2, 2005
app pub date -
Oct 25, 2004
filing date -
Oct 24, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A needle-free injection device, including a plunger and a spring operatively coupled with the plunger. The plunger is slidably disposed within a fluid chamber, is retractable to draw injectable fluid into the fluid chamber through an injection orifice, and may be advanced within the fluid chamber to forcibly eject injection fluid out through the injection orifice. The spring is configured to be compressed during arming of the injection device, and decompressed during discharge to forcibly advance the plunger within the fluid chamber. The injection device further includes an actuator operable to cause the spring to be compressed during arming of the injection device, and selectively operable prior to decompression of the spring to cause the plunger to be moved to a desired position within the fluid chamber.
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