Multi-stage or multi-piston syringe

摘要

A multi-stage or multi-piston syringe for selectively dispensing liquids comprises a body having a pair of bores each of which receives a piston and ends in a narrower line for reception of liquid from the bores. The body is connected to a movable part which has a single line or passage opening and a needle mounted on the part and connected to the bore. The movable part can be operated manually in order to bring its single line in connection with a selected line and thus to guarantee passage of liquid from the selected bore to the needle. The movable part can then be moved into another position in which the needle is in connection with the other bore. Provided on the movable part are sealing means in order to avoid leakage and backflow of liquid from or to that bore which is not dispensing any liquid at that moment.