| 摘要 |
A needle-less injector system having an ampule with an elongated hollow body. The elongated hollow body includes a nozzle and an aperture for receiving a plunger. The aperture extends from the second end of the body towards the first end and is in fluid communication with the nozzle. The ampule cooperates with a plunger that has a concave rib that extends about the perimeter of the plunger and towards the first end of the plunger. As the plunger moves through the aperture the concave rib sealingly engages the sidewalls of the aperture.
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