Effects Of Uyghur Sand Therapy On Hemodynamics Of Femoral Artery Branch Based On Fluid-Structure Interaction Method

Hemodynamics are of practical significance in terms of studying the mechanical properties of blood flow and arteries,analyzing the mechanisms of blood flow in the circulation system,furthermore reveal the causes of vascular disease combined with the theories,principles and methods of biology and medicine.Uygur sand therapy is a physical therapy which treats the disease through the multi-field effects of temperature field,stress field,magnetic field.Blood flow velocity,inner diameter of artery,vascular Resistance Index(RI),Heart Rate(HR)stimulates the blood vessel walls.Therefore,investigating the mutual effect between the blood and artery wall,exploring the change of hemodynamics parameters and physiological indicators on the effect of blood flow filed and biomechanical behaviors of artery wall,discussing its advantages and disadvantages is of paramount importance.In this paper the sand treatment experiment was conducted on the subjects in the indoor Uygur sand treatment system established by imitating turpan Uyghur sand treatment hospital,the inner diameter,vascular resistance index,heart rate and blood pressure on the different parts of the lower limb artery before and after treatment was tested respectively,the peak value of blood flow velocity,inner diameter,vascular resistance index of common femoral and heart rate of 59 subjects are selected for statistical analysis,investigates the hemodynamic effects of uygur sand treatment by experimental method.Computer tomography scan is conducted on the lower limbs of a healthy male adult subject,3 dimensional finite element model was constructed based on the CT scan data,numerical simulation of fluid-solid interaction simulation was applied using ANSYS workbench,the experimental data are used as initial conditions,hemodynamic effects of Uyhgur sand therapy and its clinical significance is discussed.Results:(1)The mean peak value of blood flow velocity,inner diameter of the femoral artery and heart rate of subjects was increased 32.43% and 2.68% and 22.4% respectively,mean value of the resistance index was decreased 4.88% after the Uyghur sand therapy,peak value of blood flow velocity,heart rate,resistance index are of statistical significance(P<0.05)while the inner diameter of the femoral artery has no statistical significance(P>0.05).(2)results of numerical simulation show that maximum increment of wall shear stress,wall pressure was reached 50% and 64% respectively after the Uyghur sand therapy,increment of velocity field is about 20%~35%;“negative pressure” time appearance for certain points is decreased in different amount.(3)The author take different particles on the arteriy to study the change rule of wall shear stress,wall pressure,it was found that change rule of various particles are of difference,wall shear stress of certain particle after treatment on femoral artery walls significantly greater than those of before sand treatment,however wall shear stress value of some particles after the sand therapy was not significantly increased,wall shear stress values of some particle after treatment were much smaller than that of before the sand therapy.Conclusions:(1)Sand therapy can increase the blood flow,improve the blood supply of human body,increase Renolds number and Womersley number,palys a positive role in terms of preventing the deposition of platelets in the arteries and the occurrence of ischemic cerebral apoplexy,improve blood flow state of human femoral artery,however it can be seen by calculating the Renolds number and Womersley number,blood flow in human femoral artery changes from laminar to turbulent flow,as a result hemangioma may appeared,it is recommended that the people who lining of blood vessels are weak buried sand should control the temperature thickness and time of treatment;(2)Sand therapy can increase the wall shear stress,plays a significant role in prevention of arterial wall thickening caused by the formation of atherosclerosis and thrombosis;(3)significant increasing of von Mises equivalent stress after Uygur sand therapy may increase the possibility of partial rupture in bifurcation,which causes blockages in blood vessels,such as blood circulation obstacles;(4)Increased blood flow velocity is not the sole causes of the wall shear stress,In the research on the changes of wall shear stress the complexity and the irregularity of the human body blood vessels cannot be ignored.