Modelling and Analysis of a new Integrated Radiofrequency Ablation and Division Device

Abstract

A new medical device prototype that integrates radiofrequency (RF) ablation and division process was developed to minimize blood and time loss during hepatic surgery. This led to the studies and experimental analyses on the mechanical properties of the liver tissue and its dynamic interaction with the cutting device. The models for the liver tissues are proposed. The fresh liver tissue is modelled using the Kelvin model whereas the Maxwell-Kelvin combination is found to closely reflect the properties of the coagulated tissue. The modelling of liver tissue/scalpel blade interaction was also performed. The mechanical models and properties acquired are implemented to determine the interaction model. Penetration experiments were then performed onto the tissues to investigate the cutting force and time essential for study of the tissue/blade relationship. The mechanical and the dynamic interaction models benefit the area of surgical simulation and planning.