Basic study of circuit internal pressure measure method using gyroscope sensor

Abstract

When performing continuous renal replacement therapy (CRRT), it is necessary to monitor the conditions of blood flow, blood coagulation conditions, and circuit conditions. Currently, only a circuit pressure can be measured for these conditions. We thought gyroscope sensor could measure these conditions, and if so, this method would enable safer treatment. In the aqueous filtration experiment, we found that the gyroscope sensor captured the vibration of the pillow as changes of an angular velocity, and the change coincided with the rotation of the blood pump. Furthermore, the peak area of the angular velocity decreased with increasing the circuit pressure by a roller clamp attached with the return circuit. This is because the increase in circuit resistance by the roller clamp decreased the actual flow rate and decreased the peak area of the angular velocity. From these results, it is suggested that a gyroscope can measure changes in the pressure in the circuit.