Modelling the Interface Pressure Applied by Knitted Structures Designed for Medical-textile Applications

Abstract

A theoretical model is proposed for prediction of the interface-pressure profile applied by plain-knitted elastomeric structures used in compression therapy. Compression therapy may be applied through pressure garments to prevent and reduce venous reflux and peripheral oedema. The interface pressure induced by a compression garment is defined by Laplace's equation, and the geometrical and mechanical behaviour of knitted structures is modelled to predict interface pressure. The geometrical mesostructure is modelled by parametric cubic-spline curves, and the mechanical system is modelled on energy-based principles. The model incorporates all possible mechanisms of deformation, including elongation, bending, compression, and volume changes of the yarns. The theoretical predictions are compared with experimental pressure profiles for four different radii of curvature.