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Conference proceedings article

Title Permanent magnet vibration power generator as an embedded mechanism for smart hip prosthesis
Author Raul Morais, N. Silva, P. Santos, C. Frias, J. Ferreira, A. Ramos, J. Simões, J. Baptista, Manuel J. C. S. Reis
Booktitle Procedia Engineering, Eurosensor XXIV Conference
Volume 5
Pages 766-769
Year 2010
Group (before 2015) Signal Processing Laboratory
Indexed by ISI Yes
Scope International


This paper describes an improved micro-power electric generator where energy harvested from human movements is used as an everlasting mechanical energy source to suffice smart hip implant electronics power needs. Its architecture is designed so that the mechanical energy promotes the movement of a combination of magnets and a spring embedded inside a Teflon tube, used to reduce friction. The changing magnetic field induces current in two coils so that the output of the generator is the sum of their signals. The end result is like a double generator in one casing. Produced electrical energy is stored in an energy reservoir handed over to a power management module. Experimental results shows that energy harvested from human walking can be used as an effective power source for hip prosthesis implants.


  • Energy harvesting
  • Biomedical implant
  • Hip prosthesis
  • Telemetry