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Research Papers

Electromechanical Modeling of Energy Harvesting From the Motion of Left Ventricle in Closed Chest Environment

[+] Author and Article Information
Yangyang Zhang, Yisheng Chen

Department of Civil Engineering,
Zhejiang University,
Hangzhou 310058, China

Bingwei Lu

Department of Engineering Mechanics,
Tsinghua University,
Beijing 100084, China

Chaofeng Lü

Department of Civil Engineering,
Zhejiang University,
Hangzhou 310058, China;
Key Laboratory of Soft Machines and
Smart Devices of Zhejiang Province,
Zhejiang University,
Hangzhou 310027, China;
Soft Matter Research Center,
Zhejiang University,
Hangzhou 310027, China
e-mail: lucf@zju.edu.cn

Xue Feng

Department of Engineering Mechanics,
Tsinghua University,
Beijing 100084, China
e-mail: fengxue@mail.tsinghua.edu.cn

1Corresponding authors.

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received February 22, 2016; final manuscript received March 10, 2016; published online March 29, 2016. Editor: Yonggang Huang.

J. Appl. Mech 83(6), 061007 (Mar 29, 2016) (7 pages) Paper No: JAM-16-1099; doi: 10.1115/1.4032994 History: Received February 22, 2016; Revised March 10, 2016

A piezoelectric mechanical energy harvesting (MEH) technique was recently demonstrated through in vivo experiment by harvesting energy from the motion of porcine left ventricle (LV) myocardial wall. This provides a new strategy of energy supply for operating implantable biomedical devices so as to avoid various shortcomings associated with battery energy. This paper resorts to an analytical electromechanical model for evaluating the efficiency of the piezoelectric MEH device especially of that used in closed chest environment. A nonlinear compressive spring model is proposed to account for the impeding effect of surrounding tissues on the device. Inputting the periodic variation of the LV volume as a loading condition to the device, numerical predictions for the electric outputs are obtained and compare well with experiments. A simple scaling law for the output electric power is established in terms of combined material, geometrical, circuit, and LV motion parameters. The results presented here may provide guidelines for the design of in vivo piezoelectric energy harvesting from motions of biological organs.

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Figures

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Fig. 1

Schematic diagram of the PZT MEH device. Cross section of the device before and after deformation (a) and 3D vision of the device after deformation (b).

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Fig. 2

Comparisons of the predicted real-time output voltage with the experimental measurements for a device subject to triangular mechanical loading

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Fig. 3

Loading condition of the device when mounted on the porcine LV. Real-time volume of the porcine LV (a) and the corresponding end-to-end displacement of the device (b).

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Fig. 4

Comparisons of the predicted and measured real-time output voltage with chest open when the device is mounted on the porcine LV

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Fig. 5

Comparisons of the predicted and measured real-time output voltage with chest closed when the device is mounted on the porcine LV

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Fig. 6

Dependence of the output power with chest closed and its relative decrement against that for open chest on the normalized stiffness coefficient of the surrounding tissues (KL03)/(Eshs)

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Fig. 7

Dependence of the normalized effective voltage |μ¯33L0VRMS/βe¯31hpnszp| and normalized effective current |L0TIRMS/βnpe¯31Apzp| on the normalized parameter (npμ¯33ApR)/(nshpT)

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Fig. 8

Scaling law for the normalized output power [(μ¯33L02T)/(β2e¯312zp2)] ⋅[Peff/(nsnpAphp)] and the normalized parameter (npμ¯33ApR)/(nshpT) for chest open ((KL03)/(Eshs)=0) and chest closed ((KL03)/(Eshs)=5)

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Fig. 9

Scaling law for the normalized output power [(μ¯33L02T)/(β2e¯312zp2)] ⋅[Peff/(nsnpAphp)] and the normalized parameter (KL03)/(Eshs) for various (npμ¯33ApR)/(nshpT)

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