| 摘要 |
The present invention is a hand-operated injector device for injecting parenteral medications consisting of a cap, a plunger, a base, and a snap means. The cap contains a hollow central finger which upon proper hand force , moves toward a narrow plunger with an ability to slide into an annular wide plunger within an self-contained injection capsule. The movemnet of the cap drives the narrow plunger toward a narrow injection orifice at the bottom th e capsule containing liquid medicament through which, the medicament under hig h pressure, forms a liquid jet through subcutaneous tissue of the patient. The injector may contain an external spring assisted holder or an internal sprin g assisted holder where the central finger is modified so as to be spring loaded. Finally, the spring injector may contain a cocking tab and a reusabl e power case. The injector device requires little training to use, reduces pai n, improves injection safety and eliminates the need for a check valve.
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