I was wondering about that too.
It's a very low mortality rate compared to surgery, but then again, it isn't surgery, so it should have an extremely low mortality rate, and these deaths are disturbing. I can easily see how a potential patient would look at this and think it sounds so much less scary than major surgery. But the success rate also needs to be considered, because what is the point of taking even a small risk if the procedure doesn't create lasting success, and it is also my understanding that the device is supposed to be removed after 6 months, which leaves the patient with...nothing.