The challenge isn't in building a reliable pump. The challenge is in the connection between the pump and the human body. If we just put a highly polished tita

The challenge isn't in building a reliable pump. The challenge is in the connection between the pump and the human body. If we just put a highly polished titanium tube in the circulation there will be blood clots, hemolysis, and other blood damage. Over time these problems become the main hurdle in getting these types of devices to work.