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

气动心室辅助装置（VAD）在日本被广泛使用。然而，目前的系统不具备足够的驾驶状态监测能力。在这项研究中，我们开发了紧凑的监测系统，可以监测驱动状态和检测异常情况，如低流量，而无需改造现有的气动VAD血泵。平均泵输出估计从通过使用MEMS质量流量传感器在传动系处测量的空气质量流量。结果表明，在模拟循环试验和动物试验的情况下，获得了较好的流量估算值（相对误差为0.25%~ 14.1%）。此外，还设计了利用气流和驱动压力检测传动系统中断引起的低流量和流入流出的报警系统。

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.