To avoid the liquid flows into the vital injector when use

During operation the vital injector, avoid the internal residual liquid flows into the machine.

Most of the operations are needle down when use the Mesogun vital injector, 

But still some friends holding the needls up when operation or finish operation.

This will lead to some residual drugs or the blood will flow slowly to the instrument inside.

May cause some parts of the instrument inside the rust, serious or even lead to a short circuit.

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