You might want to look into the BD Q-Style Vial Access or clave needleless access. I prefer the BD Q-style.
It is a device that plugs directly into the fvial and stays in it. you no longer need to draw a needle. He just screw a Luer lock syringe into it and pull the amount of fluid that you want.
Also, when the file is empty, you can just transfer the device to the next vile.
You can usually find a device for about five to $15. Sometimes they try to sell them in large packs but you can't find them individually.
I have been using these for over a year and absolutely love them.
TxHero