NASA Technical Reports Server (NTRS) 20070017901: An Implanted, Stimulated Muscle Powered Piezoelectric Generator

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by  NASA Technical Reports Server (NTRS)

An Implanted, Stimulated Muscle Powered Piezoelectric Generator
Beth Lewandowski
NASA Glenn Research Center

A totally implantable piezoelectric generator system able to harness power from
electrically activated muscle could be used to augment the power systems of implanted
medical devices, such as neural prostheses, by reducing the number of battery
replacement surgeries or by allowing periods of untethered functionality. The features of
our generator design are no moving parts and the use of a portion of the generated power
for system operation and regulation. A software model of the system has been developed
and simulations have been performed to predict the output power as the system
parameters were varied within their constraints. Mechanical forces that mimic muscle
forces have been experimentally applied to a piezoelectric generator to verify the
accuracy of the simulations and to explore losses due to mechanical coupling. Depending
on the selection of system parameters, software simulations predict that this generator
concept can generate up to approximately 700 µW of power, which is greater than the
power necessary to drive the generator, conservatively estimated to be 50 μW. These
results suggest that this concept has the potential to be an implantable, self-replenishing
power source and further investigation is underway.
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