DEVELOPMENT OF BUILT-IN-TYPE AND BLOODLES SENSOR SYSTEM FOR SMART ARTIFICIAL HEART

Abstract

We have proposed “Smart Artificial Heart (SAH)” through which doctor can observe the real-time condition of the patients and artificial heard whenever doctor wants to and wherever the patient is, and doctor can treat the patients properly using SAH in case of emergency. The purpose of this study is to develop the small size, good accuracy, bloodless and noninvasiv sensor system for SAH. The sensor system consists of the temperature sensor, flow meter and pressure sensor, which measures blood temperature pump flow, pump-inlet-pressure and pump-outlet-pressure respectively. In the test of the mock experiment and animal experiment, the following results were obtained: (1) The temperature sensor using semiconductor sensor which have good accuracy than thermocouple thermometer was built into the pump, and the reproducibility was ±0.3% and the linearity was ±0.1% in the moc experiment. (2) The doppler flow meter was built into the pump. And the measurement of the doppler flow meter built in the pump was compared with the measurement of the ready-made flow meter on the tube. The coefficient of correlation was 0.815 in the mock experiment and 0.758 in the animal experiment. (3) The pressure sensor using the strain gauge was fixed on the inlet and outlet point of the pump, and in the animal experiment, the coefficient of correlation was over 0.75 in the pump-inlet-pressure and pump out-outlet-pressure compared with LVP and AoP respectively. We could unify the sensor system including the circuits and me probe for the artificial heart. The effectiveness is confirmed through the sensor system applied to the long-term animal experiment.