| 摘要 |
A hypodermic syringe of the automatic, or self-aspirating, type for use in combination with cartridge ampoules closed at one end by a diaphragm pierceable by a double-ended hypodermic needle and closed at the other end by a slidable piston consists of a syringe holder adapted to generate aspirating conditions within the cartridge ampoule by the slight backward displacement of the slidable piston by means of a double plunger, one slidable within, and biased against, the other, the inner plunger being positively interengaged with the slidable piston of the cartridge ampoule, and axial movement of the outer plunger being positively restricted by means for locking the other plunger with a collet in the end of the syringe holder.
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