Self-Powered Wearable Micropyramid Piezoelectric Film Sensor for Real-Time Monitoring of Blood Pressure,Advanced Engineering Materials

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Self-Powered Wearable Micropyramid Piezoelectric Film Sensor for Real-Time Monitoring of Blood Pressure
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2022-09-27 , DOI: 10.1002/adem.202200873
Yunjeong Kim ₁ , JiYong Lee ₁ , Hyeonaug Hong ₁ , SeungHyun Park ₁ , WonHyoung Ryu ₁

Affiliation

Cardiovascular diseases can be prevented in advance by noninvasive and continuous real-time measurement of blood pressure using a wearable sensor. Among many recent developments, piezoelectric sensors demonstrate the possibility to monitor blood pressure continuously without relying on an external energy input. However, most of the piezoelectric-sensor research focuses on the property enhancement of piezoelectric materials without systematic investigations of how sensor performance is influenced by the microgeometry and electrode configuration of piezoelectric sensor. Herein, the micropyramid-assisted piezoelectric film (MPF) sensors are designed and constructed and their performances are investigated both experimentally and by finite-element modeling (FEM) simulations. The sensor signal that is strongly coupled to both stress amplification and capacitance change because of the micropyramids and electrode configuration is identified. After comparing the different designs of MPF sensors, it is confirmed that polydimethylsiloxane micropyramids covered with the highly compliant Ecoflex show the highest sensitivity. The MPF sensor shows the sensitivity of 685 mV N⁻¹ in a range between 50 and 400 mN. MPF sensors are attached to the wrist and neck to measure pulse pressure signals. Using the pulse pressure signals and linear regression, blood pressures are estimated and compared with the values measured with a commercial cuff device.

中文翻译：

用于实时监测血压的自供电可穿戴微金字塔压电薄膜传感器

通过使用可穿戴传感器进行无创连续实时血压测量，可以提前预防心血管疾病。在最近的许多发展中，压电传感器展示了在不依赖外部能量输入的情况下连续监测血压的可能性。然而，大多数压电传感器研究都集中在压电材料的性能增强上，而没有系统地研究压电传感器的微观几何形状和电极配置如何影响传感器性能。在此，设计和构造了微金字塔辅助压电薄膜 (MPF) 传感器，并通过实验和有限元建模 (FEM) 模拟研究了它们的性能。由于微金字塔和电极配置，传感器信号与应力放大和电容变化密切相关。在比较 MPF 传感器的不同设计后，确认覆盖有高度兼容的 Ecoflex 的聚二甲基硅氧烷微金字塔显示出最高的灵敏度。MPF 传感器显示 685 mV N 的灵敏度^-1在 50 和 400 mN 之间的范围内。MPF 传感器连接到手腕和颈部以测量脉压信号。使用脉压信号和线性回归，估计血压并将其与商业袖带设备测量的值进行比较。

更新日期：2022-09-27

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