Numerical Simulation Of Fluid Dynamics Of Total Arch Replacement Combined With Stented 'Elephant Nose' Implantation For Treatment Of Stanford Type A Aortic Dissection

Objective:The formation,development and treatment of aortic dissection are closely related to hemodynamic factors.Under physiological conditions,the distribution of flow field,tube wall pressure and wall shear force of Stanford A type aortic dissection and total bow trunk was obtained.Based on computational fluid dynamics method to establish individualized aortic dissection after full GongXiang nasal preoperative blood flow dynamics model,3 d reconstruction of hemodynamic parameters,analysis of the state of blood flow in aortic dissecting aneurysm and aortic dissection disease,evaluate the whole GongXiang for the treatment of nasal Stanford type A effect for the treatment of dissection of aorta,the interlayer in hemodynamic changes impact on the outcome of aortic dissection,and expect for clinical judgment provides the theory basis for development of aortic dissection and outcome,plans for surgery treatment to provide valuable guidance,So it can be quickly diagnosed and timely treatment is of great significance to clinical treatment,so as to improve the clinical therapeutic effect.Methods:(1)Select one with Stanford type A aortic dissection,for whole GongXiang nasal surgery and postoperative 1 week before the DICOM(Digital Imaging and Communications in Medicine)format of the CT data,using Mimics software to read the data,precise individual 3 d reconstruction model is set up.(2)The application of CAD software the 3 d model for renovation,suitable for numerical calculation of CAD model,import the ICEM mesh professional CFD software,suitable for fluid mechanics calculation of grid data.(3)Grid data provided in computational fluid dynamics analysis software CFX calculation analysis,the results of the analysis in the Ansys software for reprocessing,it is concluded that the aortic dissection whole GongXiang nose all time points before and after operation of hemodynamic parameters.Results:(1)To establish a three-dimensional reconstruction model based on the rigid assumption of the individual aortic dissection in the first three dimensional reconstruction.(2)Through the whole GongXiang nose blood flow dynamics model of computational fluid mechanics before and after operation,get detailed hemodynamic parameters,aortic dissection internal,artificial blood vessels and blood flow to the streamline distribution "trunk" stent,vascular wall pressure distribution,and shear force to the image intuitively.Conclusions:Through medical image post-processing technology established Stanford type A aortic dissection preoperative and ascending aorta and aortic arch replacement + "trunk" carotid stenting after 3 d reconstruction of three-dimensional model,it is concluded that the change of blood flow velocity,pressure and shearing force,especially in these hemodynamic parameters in blood pulsating flow under the condition of complex performance,caused the blood vessels of local physical conditions change,led to the arterial lesions.The research results show that the whole GongXiang nasal surgery is effective,is closely related to the postoperative hemodynamic changes of aortic dissecting aneurysm,especially interlining regional blood flow shear force and the change of blood flow velocity has played a very important role.It can effectively relieve the impact and pressure of the blood flow on the interlayer lesions,reduce the further expansion of the interlayer,and prevent the healing of the interlayer local lesions.According to the 3 d individualized real model of unsteady flow dynamic numerical simulation research can preliminary determination,full GongXiang nasal surgery is A kind of effective for the treatment of Stanford type A aortic dissection surgery way,has the very good clinical effect.