Device for needleless injection operating with two concentric energetic materials
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United States of America Patent
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Jul 19, 2011
Grant Date -
Nov 29, 2007
app pub date -
Sep 20, 2005
filing date -
Sep 21, 2004
priority date (Note) -
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Abstract
A needleless injection device used for intradermal, subcutaneous and intramuscular injections is disclosed. The device includes a pyrotechnic gas generator, at least one piston, a reserve of liquid active principle and an injection nozzle. The generator includes a pyrotechnic charge composed of a central energetic material that is surrounded by a second peripheral energetic material. The entire outer surface of the central energetic material contacts the inner surface of the peripheral energetic material. The two energetic materials have different rates of combustion.
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