Wearable pressure sensors capable of sensitive, precise, and continuous measurement of physiological and physical signals have great potential for the monitoring of health status and the early diagnosis of diseases. This work introduces a 3D-printed rigid microbump-integrated liquid metal-based soft pressure sensor (3D-BLiPS) for wearable and health-monitoring applications. Using a 3D-printed master mold based on multimaterial fused deposition modeling, the fabrication of a liquid metal microchannel and the integration of a rigid microbump array above the microchannel are achieved in a one-step, direct process. The microbump array enhances the sensitivity of the pressure sensor (0.158 kPa-1 ) by locally concentrating the deformation of the microchannel with negligible hysteresis and a stable signal response under cyclic loading. The 3D-BLiPS also demonstrates excellent robustness to 10 000 cycles of multidirectional stretching/bending, changes in temperature, and immersion in water. Finally, these characteristics are suitable for a wide range of applications in health monitoring systems, including a wristband for the continuous monitoring of the epidermal pulse rate for cuffless blood pressure estimation and a wireless wearable device for the monitoring of body pressure using a multiple pressure sensor array for the prevention of pressure ulcers.

中文翻译：

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用于健康监测应用的高度灵敏且可穿戴的基于液态金属的压力传感器：3D打印微凸点阵列与微通道的集成。

能够灵敏，精确，连续地测量生理和物理信号的可穿戴式压力传感器具有监测健康状况和疾病早期诊断的巨大潜力。这项工作介绍了可穿戴和健康监测应用的3D打印刚性微凸点集成液态金属基软压力传感器（3D-BLiPS）。使用基于多材料熔融沉积建模的3D打印母模，液态金属微通道的制造以及微通道上方刚性微凸点阵列的集成可以一步一步直接完成。微凸点阵列通过以微不足道的磁滞和在循环负载下稳定的信号响应来局部集中微通道的变形，从而提高了压力传感器（0.158 kPa-1）的灵敏度。3D-BLiPS还显示出对1万次多向拉伸/弯曲，温度变化和浸入水中的循环的出色鲁棒性。最后，这些特性适用于健康监测系统中的广泛应用，包括用于连续监测表皮脉搏率以进行无袖带血压估计的腕带以及用于使用多压力传感器监测人体压力的无线可穿戴设备阵列预防压疮。