| Objective Method of curing disease by burying sand treatment(sand therapy)is a kind of traditional medical treatment through the natural resources of sand dunes Turpan in Xinjiang. Sand treatment is of five applications as follows:(1) magnetic effect of the particles of the sand;(2) Some trace elements and minerals within the sand body;(3)friction effect of the sand;(4) Effect of heat transmission of the hot sand. As a non drug therapy, the sand treatment, has the application history of more than a hundred years in Turpan Xinjiang. In this paper, the experimental and finite element analysis method was used to study the effect of the sand treatment on the blood flow dynamics on the lower limb dorsal artery of the human body. Methods subjects were divided into two groups, n = 16,ten days of continuous sand therapy was conducted under the circumstances of applied 45 ℃ sand temperature, applied10 cm and 20 cm sand depth respectively, once a day, each session lasted 30 minutes,in indoor sand treatment system for sand experiment; Meanwhile upper leg circular section of the changing of the temperature and pressure by changing of the time on each test point(up, down, left, right) on the dough, and sand monitoring before and after treatment with human physiological index, dorsal artery blood flow velocity,vessel diameter and resistance index calculated perfusion fluid hemorrhage. In this paper, we first select the basic shape of the blood vessel, and then determine the diameter of each blood vessel according to the data of the dorsal artery angiography provided by Xinjiang Medical University. By this experiment can only get the dorsal artery of a larger diameter at the entrance of the artery diameter(3.48 mm) and other needed diameter by related literature and consulting the doctor to provide. Dorsal artery of foot of the first metatarsal dorsal artery of medial and lateral diameter respectively 1.90 mm and 200 mm and the diameter of the arterioles of the middle of the two is 0.21 mm. After the determination of the diameter of the artery in the dorsal vessels of the foot, the model of the dorsal artery of the foot was established by usingthe 3D software UG. Design of the human lower limb dorsalis pedis artery vascular wall as a rigid body, by experiment of dorsalis pedis artery hemodynamic changes as the boundary condition, in ANSYS were calculated dorsal arteriole at the same temperature, different buried sand thickness under the action of flow velocity,pressure and cutting stress distribution analysis. Results the experiment results Sand temperature of 45 ℃, buried in sand thickness of 20 cm on the top(One point)skin surface temperature change amount(1.3) is less than 45 ℃, 10 cm(2.1), 45 ℃,20 cm on the top(One point) pressure change amount(0.288%) the impact is greater than at 45 ℃, 10 cm(0.155%) of, 45 ℃, 20 cm on the following(point II) skin surface temperature change amount(3.5) is less than 45 ℃, 10 cm(5), 45 ℃, 20 cm on the following(point II) pressure variation(0.4%) is more than 45 ℃, 10 cm(0.55%) of, 45 ℃, 20 cm on the left(point III) skin surface temperature change amount(3.1) Effect of less than 45 ℃, 10 cm(3.4) of, 45 ℃, 20 cm on the left(Three point) pressure variation(0.19%) is more than 45 ℃, 10 cm( 0.13%) of, 45 ℃, 20 cm on the right(fourth point) skin surface temperature variation(1.8%) is less than 45 ℃,10 cm(2), 45 ℃, 20 cm on the right(fourth point) a pressure variation amount(0.43%) of the impact is greater than 45 ℃, 10 cm(0.08%) of. Hemodynamic differences before and after the sand therapy were statistically significant(P <0.05).Sand therapy before and after, sand temperature of 45 ℃, buried in sand thickness of20 cm on the peak flow velocity variation(33%) the impact is greater than 45 ℃, 10cm(29%), the sand temperature of 45 ℃, buried in sand thickness an inner diameter of 20 cm on the amount of change(0.02%) is more than 45 ℃, 10 cm(0.01%), the sand temperature of 45 ℃, buried in sand thickness of 20 cm on the amount of change in resistance index(0.07%) is more than 45 ℃, 10 cm(0.05%), the sand temperature of 45 ℃, buried in sand thickness of 20 cm on the blood perfusion change(3.15%) the impact is greater than 45 ℃, 10 cm(2.76%) of.The simulation results: 2 arterioles sand therapy before and after, sand temperature of 45 ℃, buried in sand thickness of20 cm peak variation(0.6%) of the flow velocity of the impact is greater than 45 ℃,10 cm(0.535%) of sand temperature of 45 ℃, buried in sand thickness of 20 cm on the pressure variation(0.28% *) of less than 45 ℃, 10 cm(0.55 *%), the sand temperature of 45 ℃, buried in sand thickness of 20 cm on the wall shear stress amount(0.48%) the impact is greater than 45 ℃, 10 cm(0.465%), the sand temperature of 45 ℃, buried in sand thickness of 20 cm on the amount of change in blood perfusion(0.017%) the impact is greater than 45 ℃, 10 cm(0.015%)of. No. 3sand arterioles compare before and after treatment, the sand temperature of 45 ℃,buried in sand thickness of 20 cm peak variation(0.287%) of the flow velocity of the impact is greater than 45 ℃, 10 cm(0.082%), the sand temperature of 45 ℃ impact of sand buried thickness of 20 cm of pressure variation(0.3% *) of less than 45 ℃, 10cm(0.53 *%), the sand temperature of 45 ℃, buried in sand thickness of 20 cm on the wall shear stress variation(0.265%) the impact of greater than 45 ℃, 10 cm(0.005%),the sand temperature of 45 ℃, buried in sand thickness of 20 cm on the blood perfusion change(0.01%) and the impact of 45 ℃, 10 cm(0.01%) the same.Conclusion According to the results of experiment and simulation:(1) The blood flow velocity were changed significantly after the treatment in the same temperature and the different sand thickness. THE curve which describes the changes of blood flow velocity at different moments, on different points showed that, flow velocity is more quicker at the begining of the simulation and is a gentle, process tends to be stable in the micro during the last 5 seconds artery after sand therapy, so people feel very comfortable after the sand therapy.(2) The blood perfusion rate were changed significantly after the treatment in the same temperature and the different sand thickness. Reflect the blood perfusion of the tissue capillaries with diameters of tens of microns of arterioles, venules micro vascular blood flow and living tissue blood perfusion rate in organization of matter and energy transmission has an important role, many factors, such as drug delivery,thermal effects, and noise will cause changes in blood perfusion rate. The influence of blood perfusion rate on the blood perfusion rate is important in the study of the thermal dose. In the process of sand therapy, considering the effect of heat transfer,the treatment of the disease is mainly affected by the heat transfer, so the change of blood perfusion rate is a theoretical basis for clinical research.(3) Uyghur sand therapy after micro changing of diameter and apparent acceleration of blood flow velocity of human dorsal micro artery has resulted in the increasing of the wall shear, the relevant studies has showed that the low wall shear stress plays a very important role information of atherosclerosis and its development process, so the increase in wall shear stress can effectively reduce the developing process of the atherosclerosis phenomenon. |
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