Kawahito Koji
Division of Cardiovascular Surgery, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan,
J Artif Organs. 2013 Sep;16(3):393-6. doi: 10.1007/s10047-013-0709-1. Epub 2013 Apr 27.
Although non-destructive and continuous monitoring is indispensable for long-term circulatory support with rotary blood pumps, a practical monitoring system has not yet been developed. The objective of this study was to investigate the possibility of detecting pump failure caused by thrombus formation through the monitoring of vibration signals. The data acquisition equipment included vibration pickups, a charge amplifier, vibration analysis systems, and exclusive hardware. A pivot-bearing centrifugal pump with a mock circuit was investigated for vibration analysis. To simulate the four common areas of thrombus formation, we used a piece of silicon attached to each of the following four locations: the total area of the bottom of the impeller, an eccentric shape on the bottom of the impeller, a circular shape around the shaft top, and an eccentric shape on the top of the impeller. Vibration signals were picked up, and the power spectrum density analysis was performed at pump rotational speeds of 2100, 2400, and 3000 rpm. In this study, pump failure could be detected, and the types of imitation thrombi could be determined. We conclude that vibration detection with a computerized analysis system is a potentially valuable diagnostic tool for long-term circulatory support with rotary blood pumps.
尽管对于旋转血泵的长期循环支持而言，无损且连续的监测必不可少，但实用的监测系统尚未开发出来。本研究的目的是通过监测振动信号来研究检测由血栓形成导致的泵故障的可能性。数据采集设备包括振动传感器、电荷放大器、振动分析系统和专用硬件。对带有模拟回路的枢轴轴承离心泵进行了振动分析。为了模拟血栓形成的四个常见区域，我们在以下四个位置分别粘贴了一块硅片：叶轮底部的整个区域、叶轮底部的偏心形状区域、轴顶部周围的圆形区域以及叶轮顶部的偏心形状区域。采集振动信号，并在泵转速为2100、2400和3000转/分钟时进行功率谱密度分析。在本研究中，可以检测到泵故障，并确定模拟血栓的类型。我们得出结论，利用计算机分析系统进行振动检测对于旋转血泵的长期循环支持是一种潜在有价值的诊断工具。
