my kidneys are failing and the surgeon knew my veins were too small so he put a graph in my arm. the graph cut off the blood flow to my hand.

At face value, it sounds like the complication occurred but the procedure was necessary to provide you with needed medical care.  Sometimes complications occur in the absence of negligence.  Additionally, doctors often have to make decisions about whether to incur a risk of a complication when they're dealing with medical issues that are of greater concern.  I probably would not meet with you to investigate the potential malpractice case based on the above, but you should contact a local malpractice attorney and discuss these issues with him and he can provide you with more particular guidance.