1, artificial heart valve: is a medical device implanted in the heart of patients suffering from valvular heart disease, when one of the four heart valves fails, the medical choice is to replace the natural valve with an artificial valve, which requires direct cardiac surgery.
2, artificial kidney: is a simulation of human kidney function, used to replace the human kidney for blood purification of medical equipment. The artificial kidney consists of blood pump, filter, control system and other parts, which can remove waste and excess water from the blood, regulate fluid balance and acid-base balance, as well as secrete some endocrine hormones.