Help What is the largest cannula I can insert to a vein on my dorsum of hand?

[Sunset Limited]

My veins aren't too thick. I need a cannula on the dorsum of my hand. The cannula should be as large as possible. Which cannula is better?

 

[BPD Barbie]

Probably a 16 as you can push fluids and things through it fairly quickly and it doesnt cause too much pain. But if your veins are fairly small then a 20 is better. What are you going to put through one?

 

[Sunset Limited]

Probably a 16 as you can push fluids and things through it fairly quickly and it doesnt cause too much pain. But if your veins are fairly small then a 20 is better. What are you going to put through one?

Yes, actually i need a fast injection.16 could be very well. I think i will use 16 or 18. The vein is long enough for 18 and 16 but I'm not sure about diameter. My vein's diameter is 2 or 2,5 millimeters.