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UPA Perpustakaan Universitas Jember

Energy harvesting from cerebrospinal fluid pressure fluctuations for self-powered neural implants

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In this paper, a novel method to generate electrical
energy by converting available mechanical energy from pres-
sure fluctuations of the cerebrospinal fluid within lateral ven-
tricles of the brain is presented. The generated electrical power
can be supplied to the neural implants and either eliminate
their battery need or extend the battery lifespan. A diaphragm
type harvester comprised of piezoelectric material is utilized
to convert the pressure fluctuations to electrical energy. The
pressure fluctuations cause the diaphragm to bend, and the
strained piezoelectric materials generate electricity. In the
framework of this study, an energy harvesting structure having
a diameter of 2.5 mm was designed and fabricated using
microfabrication techniques. A 1:1 model of lateral ventricles
was 3D–printed from raw MRI images to characterize the har-
vester. Experimental results show that a maximum power of 0.62
nW can be generated from the harvester under similar physical
conditions in lateral ventricles which corresponds to energy den-
sity of 12.6 nW/cm 2 . Considering the available area within the
lateral ventricles and the size of harvesters that can be built using
microfabrication techniques it is possible to amplify to power up
to 26 nW. As such, the idea of generating electrical energy by
making use of pressure fluctuations within brain is demonstrated
in this work via the 3D–printed model system.

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