Research Of Intelligent Control For The Left Ventricular Assist Driving Device

Heart is the power source of human circulatory system. It drives sufficient blood flowing through the organs and tissues to supply them with oxygen and nutrient. By the same time the blood take the metabolin away. Nowadays as the pace of life is accelerating, a lot of person are working under stress constantly. And a variety of bad habits can be found everywhere. Both of these reasons lead to the amount of patients with heart disease rapidly increasing, which threatens human health and does great harm to human body. Among all kinds of heart diseases, cardiogenic shock cased by myocardial infarction, low cardiac output after cardiac surgery, chronic heart failure, valve failure, and myocarditis is the critically clinical status which always needs treatment immediately. Finally, mortality of patients with cardiogenic shock is about 40%~80%.In addition to medicine and heart transplantation, Left Ventricular Assist Device(LVAD) is an effective treatment for cardiogenic shock which is used more and more by developed countries on clinic. It can partly or entirely replace the pump function of ventricular providing those patients with hemodynamic support to lighten the cardiac's load. According to the way blood being driven, LVAD can be divided into pulse-type and non-pulse-type. Drive system is one of the critical parts. It affects the performance and clinical application of LVAD directly. This research is committed to the studies of intelligent drive system for the pulse-type LVAD. Considering the requirements and the characteristics of this type LVAD, we invented a universal drive device for it. We used the technology named embedded system to deal with the problem. In the device, a chip of micro control chip worked as the control core and a servo motor worked as the power source. On this basis, medical sensor was taken to sample the patient's central aortic pressure data at real-time. By processing and analyzing the data we hoped to identify the start point of systolic and diastolic in a cardiac cycle at the same time. Then the device could worked synchronously with the heart. Doing this could lighten the load of heart significantly and facilitate the recovery of the heart after surgery. The study results will do some help to promote national research and development of circulation assist device as well as clinical applications.