I want to hear more about this. This is from 2007 so there may be more recent information.
"The blood-vessel wall is a complicated structure," says Elazer Edelman, director of the Harvard-MIT Biomedical Engineering Center and cofounder of Pervasis. When the endothelium is damaged, it leads to a condition called intimal hyperplasia--an abnormal growth of smooth muscle cells. The vessel walls then scar and thicken, leading to restenosis.
The Pervasis product contains endothelial cells grown from culture. The factors released by the cells "send the signal that the endothelium is okay, that it's in control," says Pervasis CEO Steve Bollinger. It gives the endothelium time to heal itself. The gel biodegrades after 30 to 60 days.
It was being tested in patients with kidney dialysis, which might mean it was being tested in jugular veins. The product wraps around the outside of the blood vessel, so there would be a cut into the neck to get it there.
the company is still around, five years later: http://www.pervasistx.com/