Design Study on Customised Piezoelectric Elements for Energy Harvesting in Total Hip Replacements

Hans-E. Lange, Rainer Bader and Daniel Kluess
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Hans-E. Lange: Department of Orthopaedics, Rostock University Medical Center, 18057 Rostock, Germany
Rainer Bader: Department of Orthopaedics, Rostock University Medical Center, 18057 Rostock, Germany
Daniel Kluess: Department of Orthopaedics, Rostock University Medical Center, 18057 Rostock, Germany

Energies, 2021, vol. 14, issue 12, 1-13

Abstract: Energy harvesting is a promising approach to power novel instrumented implants that have passive sensory functions or actuators for therapeutic measures. We recently proposed a new piezoelectric concept for energy harvesting in total hip replacements. The mechanical implant safety and the feasibility of power generation were numerically demonstrated. However, the power output for the chosen piezoelectric element was low. Therefore, we investigated in the present study different geometry variants for an increased power output for in vivo applications. Using the same finite element model, we focused on new, customised piezoelectric element geometries to optimally exploit the available space for integration of the energy harvesting system, while maintaining the mechanical safety of the implant. The result of our iterative design study was an increased power output from 29.8 to 729.9 µW. This amount is sufficient for low-power electronics.

Keywords: energy harvesting; piezoelectricity; finite element analysis; total hip replacement; orthopaedic implant; design study (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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