As many of you likely know, IV's are an important part of modern medicine. As more and more people go into space for longer periods, I would imagine it may become necessary for an IV to be administered in space. It doesn't seem initially that this would face a lot of challenges to be performed in zero gravity from a mechanistic point of view since many IV's use a pump to control flow rate.
Is there any history of IV's either being administered or tested on a person or skin+vein stand-in? If not, is there a reason other than lack of interest?