The batteries of the current pacing devices are relatively large and occupy over 60 percent of the size of pulse
generators. Therefore, they cannot be placed in the subtle areas of human body. In this paper, the mastication force and
the resulting tooth pressure are converted to electricity. The pressure energy can be converted to electricity by using the
piezoelectric effect. The tooth crown is used as a power autonomous pulse generator. We refer to this envisioned pulse
generator as the smart tooth. The smart tooth is in the form of a dental implant. A piezoelectric vibration energy
harvester is designed and modeled for this purpose. The Piezoelectric based energy harvesters investigated and analyzed
in this paper initially includes a single degree of freedom piezoelectric based stack energy harvester which utilizes a
harvesting circuit employing the case of a purely resistive circuit. The next step is utilizing and investigating a bimorph
piezoelectric beam which is integrated/embedded in the smart tooth implant. Mastication process causes the bimorph
beam to buckle or return to unbuckled condition. The transitions results in vibration of the piezoelectric beam and thus
generate energy. The power estimated by the two mechanisms is in the order of hundreds of microwatts. Both scenarios
of the energy harvesters are analytically modeled. The exact analytical solution of the piezoelectric beam energy
harvester with Euler–Bernoulli beam assumptions is presented. The electro-mechanical coupling and the geometric
nonlinearities have been included in the model for the piezoelectric beam.
Muath Bani-Hani and M. Amin Karami, "Energy harvesting from mastication forces via a smart tooth," Proc. SPIE 9803, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016, 98030A (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 21, 2016; Published: 20 April 2016); https://doi.org/10.1117/12.2219390.
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