Needleless hypodermic injection device
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United States of America Patent
Stats
-
May 17, 1994
Issued Date -
N/A
app pub date -
Jun 13, 1991
filing date -
Nov 9, 1989
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A needleless injection device has a housing containing a pilot valve connectable to a compressed gas source. A two stage power amplifying valve includes a main valve operatively connected to the pilot valve. The pilot valve and main valve form a two-stage valve with the pilot valve activatable to open the main valve utilizing gas pressure. Compressed gas in a reservoir flows through the open main valve to drive a plunger into an ampule to inject an injectant through a patient's skin. Interlocks are provided to resist inadvertent actuation of the device and a indicator indicates whether there is sufficient gas pressure in the device for another injection. An ampule for needleless injection has a nozzle length to nozzle diameter ratio of from 2.0 to 5.0 and a throat cone flair angle of from 10-14 degrees.
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Family
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