Zhang Yangyang, Lu Bingwei, Lü Chaofeng, Feng Xue
Department of Civil Engineering, Zhejiang University, Hangzhou 310058, People's Republic of China.
Department of Engineering Mechanics, Tsinghua University, Beijing 100084, People's Republic of China.
Proc Math Phys Eng Sci. 2017 Nov;473(2207):20170615. doi: 10.1098/rspa.2017.0615. Epub 2017 Nov 22.
Self-powered implantable devices with flexible energy harvesters are of significant interest due to their potential to solve the problem of limited battery life and surgical replacement. The flexible electronic devices made of piezoelectric materials have been employed to harvest energy from the motion of biological organs. Experimental measurements show that the output voltage of the device mounted on porcine left ventricle in chest closed environment decreases significantly compared to the case of chest open. A restricted-space deformation model is proposed to predict the impeding effect of pleural cavity, surrounding tissues, as well as respiration on the efficiency of energy harvesting from heartbeat using flexible piezoelectric devices. The analytical solution is verified by comparing theoretical predictions to experimental measurements. A simple scaling law is established to analyse the intrinsic correlations between the normalized output power and the combined system parameters, i.e. the normalized permitted space and normalized electrical load. The results may provide guidelines for optimization of energy harvesting from heartbeat or the motions of other biological organs using flexible piezoelectric energy harvesters.
具有柔性能量收集器的自供电植入式设备因其解决电池寿命有限和手术更换问题的潜力而备受关注。由压电材料制成的柔性电子设备已被用于从生物器官的运动中收集能量。实验测量表明，在胸部封闭环境中安装在猪左心室上的设备的输出电压与胸部开放的情况相比显著降低。提出了一种受限空间变形模型，以预测胸腔、周围组织以及呼吸对使用柔性压电设备从心跳中收集能量效率的阻碍作用。通过将理论预测与实验测量结果进行比较来验证解析解。建立了一个简单的比例定律，以分析归一化输出功率与组合系统参数之间的内在相关性，即归一化允许空间和归一化电负载。这些结果可为使用柔性压电能量收集器从心跳或其他生物器官的运动中优化能量收集提供指导。
