A puncture biopsy is a widely used, minimally invasive surgery process. During the needle\ninsertion process, the needle body is always in direct contact with a biological soft tissue. Tissue\nadhesion and different degrees of tissue damage occur frequently. Optimization of the needle surface,\nand especially the lubrication of the needle surface, can deal with these problems efficiently. Therefore,\nin this paper, a biocompatible hydrophilic coating was applied onto the surface of a needle to improve\nthe surface quality of the needle surface. Further, a simplified finite element model of insertion was\nestablished, and extracorporeal insertion experiments were used to verify the accuracy of the model.\nThen, by analyzing a simulation model of a coated needle and a conventional needle, the influence of\nthe application of the coated needle on the insertion process was obtained. It can be seen from the\nresults that the coating application relieved the force on the needle and the soft tissue during the\ninsertion process and could significantly reduce friction during the insertion process. At the same\ntime, the deformation of biological soft tissue was reduced, and the adhesion situation between the\nneedle and tissue improved, which optimized the puncture needle.
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