Needleless hypodermic injection device
First Claim
1. A needleless injection system comprising:
- a needleless injection device;
an ampule having;
an ampule body containing an injectant chamber;
a tubular shroud attached to the ampule body;
a nozzle section attached to the ampule body concentric with the shroud, the nozzle section having a nozzle opening leading into the injectant chamber;
a Luer fitting on the nozzle section and substantially within the shroud, the Luer fitting having a minimum diameter of approximately 0.15 inch adjacent to the nozzle opening and tapering linearly outwardly to larger diameters towards the injectant chamber;
a plunger slidably displaceable into the injectant chamber; and
means for attaching the ampule to the injection device.
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Accused Products
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.
695 Citations
11 Claims
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1. A needleless injection system comprising:
- a needleless injection device;
an ampule having;an ampule body containing an injectant chamber; a tubular shroud attached to the ampule body; a nozzle section attached to the ampule body concentric with the shroud, the nozzle section having a nozzle opening leading into the injectant chamber; a Luer fitting on the nozzle section and substantially within the shroud, the Luer fitting having a minimum diameter of approximately 0.15 inch adjacent to the nozzle opening and tapering linearly outwardly to larger diameters towards the injectant chamber; a plunger slidably displaceable into the injectant chamber; and means for attaching the ampule to the injection device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- a needleless injection device;
Specification