Needleless hypodermic injection device

Details Needleless hypodermic injection device Needleless hypodermic injection device

A - Human Necessities

61

M

128/65

A61M 11/06 (2006.01) A61M 5/30 (2006.01) A61M 5/20 (2006.01) A61M 5/31 (2006.01) A61M 5/48 (2006.01)

Patent

CA 2028870

PATENT 189/230 ABSTRACT OF THE INVENTION A needleless injection device has a housing containing pilot valve connectable to a compressed gas source. A two stage power amplifying valve includes a main valve operatively connected 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.

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