4.6 Article

A new device for the combined measurement of friction and through-thickness deformation on ex vivo skin samples

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ELSEVIER
DOI: 10.1016/j.jmbbm.2022.105141

Keywords

Skin; Digital image correlation; Biotribology

Funding

  1. Auvergne-Rhone-Alpes region, France through the ``Pack Ambition Recherche'' grant

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The aim of this study was to develop a new device to study the mechanical interaction between medical devices and skin, and its effects on shear strain and friction behavior. The experiment results showed that skin surface conditioning had a significant impact on friction properties.
Skin irritation is a common phenomenon that becomes a real concern when caused by the use of medical devices. Because the materials used for the design of these devices are usually carefully selected for chemical compatibility with the skin, it is reasonable to assume that the irritations result from the mechanical interaction between the devices and the skin. The aim of this work was to develop a new device to study both the shear strains in the layers of the skin, using Digital Image Correlation (DIC), and the friction behaviour of ex vivo skin interacting with objects. Pig skin samples with various surface preparations were tested in friction experiments involving different contacting materials encountered in the conception of medical devices. The measure of the static and dynamic coefficients of friction as well as the length of adhesion has highlighted the great influence of skin surface conditioning on friction properties. Strain maps obtained through DIC provided insights into the impact of friction and adhesion effects on shear strain distribution in the skin as a function of depth beneath its surface.

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