Influence of Biocompatible Hydrophilic Coated Needle on Puncture Process through a Simulation Method

摘要

Needle biopsy is the main method for obtaining histopathological diagnosis of bone and soft tissue tumors.In needle biopsy process,the biological soft tissue is in direct contact with the needle body surface.The optimization of the needle surface,especially the degree of lubrication of the needle surface,affects the friction between the needle and the biological soft tissue and degree of damage to the biological soft tissue.Therefore,in this paper,a kind of biocompatible hydrophilic super lubrication coating has been selected on the surface of the needle body.Hence,a simplified finite element puncture model has been established and the accuracy of the model was verified with an extracorporeal puncture experiments.Then,the puncture simulation model of coated needle and conventional needle was used to analyze the influence of the application of coated needle on the puncture process.The results show that coating plays an active role in relieving the stress of the needle body and biological soft tissue during puncture process and the application of coating can significantly reduce the friction during puncture process.At the same time,the deformation of biological soft tissue was reduced to a certain extent,which provided a direction for further optimizing the puncture needle.