Large Area Ballistocardiography Enabled by Printed Piezoelectric Sensor Arrays on Elastomeric Substrates

IF 6.4 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Peter Zalar, Marieke M. A. Burghoorn, Joost A. Fijn, Lars F. A. Rikken, Peter A. Rensing, Jeroen van den Brand, Dago M. de Leeuw, Edsger C. P. Smits
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Abstract

Ballistocardiography (BCG) studies ballistic forces on the body generated during a heartbeat. As it is an unobtrusive detection method, that requires sensors measuring small dynamic forces. Piezoelectric sensors are ideal, but improvements in sensitivity are needed. Here, a universal method is demonstrated to obtain enhanced effective transverse charge constants by utilizing thin and long sensors fabricated upon compliant substrates. This approach is validated using the uniquely printable and patternable piezoelectric polymer, poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE). Discrete sensors detect displacements of less than 1 µm, dynamic forces of ∼mN, and accelerations of ≈1 mm−1 s2. Since the sensor is screen-printable, it is upscaled to a human-sized array (60 × 90 cm, 255 sensors). High quality spatially resolved BCG measurements of a person is demonstrated in seated and supine positions. The obtained heart rate is verified using photoplethysmography. This development opens the door to ever-more sensitive piezoelectric sensors, crucial for applications including and beyond healthcare.

Abstract Image

Abstract Image

通过在弹性基底上印刷压电传感器阵列实现大面积球形心动图成像
弹道心动图(BCG)研究心跳时对人体产生的弹道力。由于这是一种非侵入式检测方法,因此需要传感器来测量微小的动态力。压电传感器是理想的选择,但需要提高灵敏度。在这里,我们展示了一种通用方法,利用在顺应性基底上制造的薄而长的传感器,获得增强的有效横向电荷常数。这种方法利用独特的可印刷和可图案化的压电聚合物聚偏氟乙烯-三氟乙烯(P(VDF-TrFE))进行了验证。离散传感器可检测到小于 1 µm 的位移、∼mN 的动态力和 ≈1 mm-1 s2 的加速度。由于传感器可在屏幕上打印,因此可放大到人体大小的阵列(60 × 90 厘米,255 个传感器)。在坐姿和仰卧姿势下,对人的高质量空间分辨 BCG 测量得到了验证。获得的心率通过光电血压计进行验证。这项研发为更灵敏的压电传感器打开了大门,这对医疗保健等应用至关重要。
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来源期刊
Advanced Materials Technologies
Advanced Materials Technologies Materials Science-General Materials Science
CiteScore
10.20
自引率
4.40%
发文量
566
期刊介绍: Advanced Materials Technologies Advanced Materials Technologies is the new home for all technology-related materials applications research, with particular focus on advanced device design, fabrication and integration, as well as new technologies based on novel materials. It bridges the gap between fundamental laboratory research and industry.
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