My wife is on dialysis since March 2016. She has a fistula in her arm. Her arteries and veins are deep. So they have been having some problems using the fistula. We were talking to one of her doctors. He remembered a medical sales man talking to him about some sort of tube to connect to the fistula, with one end lying just under the skin. Then they would use that end and stick the tubing. He believes it was made of titanium. He is having someone trying to find the salesman. Have you heard of this? If so, do you know the name?