Development of the ultra compact monitoring system for a ventricular assist device to realize enhanced safety

气动心脏辅助装置(VAD)在日本得到广泛应用。然而，目前的系统还不具备足够的驾驶状态监测能力。在本研究中，我们开发了紧凑型监控系统，可以在不对现有气动VAD血泵进行改造的情况下，对驾驶状态进行监控，并检测出低流量等异常情况。通过在传动系使用MEMS质量流量传感器测量的空气质量流量来估算平均泵输出。结果表明，在模拟循环试验和动物试验的情况下，得到了较好的估算流量(相对误差为0.25%~14.1%)。此外，还构建了利用风量和行驶压力检测传动系中断引起的低流量和出入流的报警系统。

A pneumatic ventricular assist device(VAD) is widely used in Japan. However, the current system doesn't have enough capability of the driving status monitoring. In this study, we developed the compact monitoring system that can monitor the driving status and detect abnormal conditions such as low flow without remodeling the existing pneumatic VAD blood pump. The mean pump output was estimated from the air mass flow measured by using MEMS mass flow sensor at the driveline. As result, favorable estimated flow was acquired in the situation of mock circulation tests and animal tests(Relative error : 0.25%-14.1%). Additionally, the alarm system for detection of the low flow caused by interruption of the driveline and the inflow-outflow by using the airflow and the driving pressure was constructed.