Abstract
In most pneumatic blood pumps, the air pressure is delivered from the pressure generating device to the blood sac through the transmission line. The positive air pressure makes the blood sac to eject the blood, and the negative air pressure makes the blood to be drained to the blood sac. Inadequate air pressure condition can make the blood sac not to be full-filled and full-ejected, especially in the pneumatic pump with the closed air circuit. The objective of this study is to measure the filling ratio and the ejection ratio of the blood sac using the ultrasonic sensor for optimization of the pressure condition to make full-fill and full-ejection mode in the electro-pneumatic blood pump which adopts bellows-push mechanism instead of air compressor. The position of diaphragm in the blood sac is detected by the ultrasonic sensor with measuring the time of flight of the ultrasound. The sensor signal is analyzed by the digital signal processor(DSP) and the filling and ejection ration is estimated from the diaphragm position changes. This ultrasonic sensor system yielded 2mm resolution of the diaphragm position in in-vitro test. These informations could be fed back to the electro-pneumatic pump to make air pressure compensation for optimization of air pressure condition. Moreover, if the resolution of estimated filling and ejection ration is increased, the pump output could be estimated also.
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