| 摘要 |
This invention is a hypodermic jet injector employing self-contained, patient fillable, thin walled disposable ampules (210). Each ampule (210) includes an elongate plastic body with an injection orifice (234) at a first end, an internal propellant at a closed second end, and a double piston (238) slidably and sealingly mounted within the body entirely between the orifice (234) and the internal propellant, and also includes an auxiliary access opening. The thin walled ampule (210) has expandable side walls of insufficient strength to independently withstand normal peak operating pressures developed during an injection and is received in and supported by the barrel (208) of a hypodermic jet injector (200). The main body of the ampule (210) is molded with draft angles, and the double piston construction includes a soft rubber plunger with the two plungers interconnected by a connecting rod (250) spanning the central section of the ampule (210).
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