| 摘要 |
A syringe for administering medicines, pharmaceuticals, and other liquid or semi-liquid materials includes a movable scale which is automatically reset to a zero position after a preselected dosage of material has been discharged from the syringe. The scale is adjustable for selecting subsequent dosages to be discharged, which may be the same or different in quantity from the previously discharged dosage. The automatic zero reset feature of the scale enables a user to administer multiple dosages of material from the same syringe, and vary the quantity of each dosage if desired, without the need to make calculations or adjust the scale to compensate for either the quantity of material previously discharged from the syringe or the quantity of material currently remaining in the syringe. The automatic zero reset function is provided by a scale which is movable, together with a slideable stop element, relative to a plunger of the syringe, and releasably lockable at preselected positions on the plunger corresponding to the quantity of material to next be discharged from the syringe. In further aspects of the invention, the front ends of the plunger and a forward container are tapered for complementary fit, and a storage element is provided on the syringe for removably retaining a cover for a discharge outlet when the syringe is being used.
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