Optimization and Long-Term Stability of Micro Flow Sensors for Smart VP Shunts

Optimization and Long-Term Stability of Micro Flow Sensors for Smart VP Shunts
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用于智能 VP 分流器的微流量传感器的优化和长期稳定性

DOI:
10.1109/jsen.2020.2984781
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发表时间:
2020
影响因子:
4.3
通讯作者:
Anton, Rein
Anton, Rein
中科院分区:
综合性期刊2区
文献类型:
--
作者:
Edes, Gergo;Enikov, Eniko T.;Skoch, Jesse;Anton, Rein

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本文报告了用于植入式脑室-腹腔分流器的微流量传感器的流量灵敏度和分辨率的系统研究。流量传感器采用铁磁瓣(换能器),其偏转由超灵敏MTJ传感器(20 mV/V/Oe)检测。在最大不确定度为4% RMS和分辨率为0.4 ml/h时,证明了0-40 ml/h的工作范围。早期的研究,这种传感器揭示了显着的低频噪声(漂移)限制的灵敏度为1.4毫升/小时。本研究确定热噪声的低频漂移的主要来源。使用热补偿,它被发现,漂移可以减少到每24小时2毫升以下。结合一个阵列的四个传感器串联工作,它已被证明,灵敏度可以提高10.9倍。此外,该报告还检查了传感器的长期结构稳定性,并生成了一份腐蚀报告,建议使用寿命为15至55年。
This paper reports on a systematic study of the flow sensitivity and resolution of micro-flow sensors intended for use in implantable ventricular-peritoneal shunts. The flow sensors utilize ferromagnetic flaps (transducers) whose deflection is detected by ultra-sensitive MTJ sensors (20mV/V/Oe). A working range of 0-40 ml/h was demonstrated at a maximum uncertainty of 4% RMS and a resolution of 0.4 ml/h. Earlier studies on this sensor unveiled significant low-frequency noise (drift) limiting the sensitivity to 1.4 ml/hr. The present study identifies thermal noise as the main source of low-frequency drift. Using thermal compensation it was found that the drift can be reduced below 2 ml per 24-hr. Combining an array of four transducers operating in series, it has been demonstrated that a sensitivity can be increased 10.9 fold. Furthermore, the report examines the long-term structural stability of the sensors and produces a corrosion report suggesting a lifespan of 15 to 55 years.
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