1.Hold the colorful acus s cover in one hand.Let the port of the bi-direction be exposcd.Screw thc port into the holder.The colorfulacus s cover will protect the forwcrd part ofthc bi-direction from bacteria s pollution.
2.Let the part ready for vein puncturing,then antisepsis it.Remove the colorful acus s coverand expose the head of bi-direction acus,then puncture veins stanting on15unit of measure.
