An extendable prosthesis for implantation in a human leg has been developed. The friction forces during extension of the prosthesis must be low, so a coating of Teflon-S was applied to the sliding surfaces. During walking, damage can occur as a result of oscillatory relative motion. Therefore experiments were performed with an apparatus which simulated this type of motion. It was found that the coefficient of friction reached a maximum value within one million movement cycles. This maximum value of the coefficient of friction increased with decreasing coating thickness. Even at an initial coating thickness of less than 1 μm, coating with Teflon-S was found to be very effective in reducing friction.
- friction coefficient
- extendable prosthesis
- Oscillatory relative motion
Ligterink, D. J., Verkerke, G. J., & de Gee, A. W. J. (1990). Friction of Teflon-S-coated Ti-6Al-4V under conditions of oscillatory relative motion. Tribology international, 23(5), 346-350. https://doi.org/10.1016/0301-679X(90)90008-D