Needleless hypodermic injection device
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United States of America Patent
Stats
-
Jan 24, 1995
Grant Date -
N/A
app pub date -
Jul 24, 1992
filing date -
Jul 24, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A needless injection device includes an initiator valve controlling flow of compressed gas into a reservoir. A poppet valve connecting to the reservoir has a gas pressure regulation end to regulate flow from the initiator valve into the reservoir. A clamp piston is driven forward by gas pressure from the reservoir and causes jaws to clamp onto a plunger extending into an ampule. The poppet valve opens when reservoir pressure reaches the cracking pressure of the poppet valve. Gas from the reservoir rushes through the popper valve into a drive chamber and forces a drive piston, containing the clamp piston and jaws, forward causing the plunger to slide into the ampule. A jet of injectant sprays out of the nozzle of the ampule and penetrates through the patient's skin.
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