Accurate Modeling Of Soft Tissue And Surgical Instrument From Vascular Interventional Surgery System

Cardiovascular disease is recognized as a serious of threat to human life and healthy. As an important means for treatment of cardiovascular diseases, with the help of catheter technique and minimally invasive surgery in medical imaging, it realizes treatment to vascular lesions. Virtual surgery training system has become the focus of digital medical research gradually. It is used in teaching, training, rehearsal, preoperative surgical instrument modeling and analysis. Human soft tissue modeling in virtual surgery system has become a hot research topic. It reflects the real deformation processes of soft tissue, in which spring model and finite element model are the most commonly used. The quality of soft tissue model directly affects accuracy of virtual surgery training system.Soft tissue modeling is a complicated process, including physical model, geometric model and computational model. Material properties of soft tissue modeling determine the simulation results of human organs. Therefore, we design a experiment to calculate physical parameters of soft tissue based on biomechanics machine platform. The mainly research work include following points:Firstly, we design liver puncture experiment based on X-Y table. And we do simulation of liver puncture test based on the finite element method. By analyzing the simulation data and experimental curve, we see that the finite element method can be applied to simulation of soft tissue deformation.Secondly, in order to improve trueth of soft tissue deformation based on the finite element method, we design the axial tension test of blood vessel and interventional guide on biomechanics machine platform in this paper. We compute biomechanical properties of vascular tissue. After the experiment we design simulation of blood vessel tensile test based on finite element method. It proves that the results verify validity of experiment by comparing the stress and strain curves.Thirdly, we design the virtually interventional surgery system. It constructes vascular model and surgical instrument model by finite element method. By numerical calculating we finish simulation of intervention to the blood vessel.