Design and validation of a bioreactor for engineering vocal fold tissues under combined tensile and vibrational stresses

Journal of Biomechanics
Ingo R TitzePatrick A Tresco

Abstract

Criteria are outlined for the design of a bioreactor that can simulate the vibrational stresses in vocal fold movement during speech. Requirements are 0-1 mm amplitudes in the 20-200 Hz frequency range, a variable on-off stress regime, and maintenance of tissue viability over several days. The bioreactor uses dual drivers, one for low frequency (or static) strains, and another for high-frequencies vibrational strains. Response is linear at the driving end for an input of 0-5 V. The amplitude decreases linearly with frequency at constant input voltage, and the phase changes by nearly 180 degrees over the 20-200 Hz range. Human vocal fold fibroblasts were cultured in a polymer substrate and subjected to static and vibrational forces. The results indicate that vibratory strain alters the expression levels of many extracellular matrix-related genes, as well as the spatial distribution of cells and matrix.

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