| ZHENG Kai-rui,YANG Fa-zhan,ZHAO Guo-dong,BIAN Dong-chao,HUANG Ke,LIN Yun-long.Effect of Hexagonal Micro Texture on Blood Flow Characteristics of Vascular Stent[J],51(9):280-287, 310 |
| Effect of Hexagonal Micro Texture on Blood Flow Characteristics of Vascular Stent |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.09.029 |
| KeyWord:micro texture vascular stent near wall blood flow velocity |
| Author | Institution |
| ZHENG Kai-rui |
School of Mechanical & Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| YANG Fa-zhan |
School of Mechanical & Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| ZHAO Guo-dong |
School of Mechanical & Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| BIAN Dong-chao |
School of Mechanical & Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| HUANG Ke |
School of Mechanical & Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| LIN Yun-long |
School of Mechanical & Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
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| Abstract: |
| In recent years, there is a high incidence of cardiovascular and cerebrovascular diseases in China. The treatment methods mainly include surgery, drug therapy and interventional therapy. Surgical treatment is more traumatic, high risk, many adverse reactions of drug treatment, long treatment cycle, and the effect is not obvious. In contrast, interventional therapy has the advantages of safe operation, less surgical trauma, high success rate and less complications. At present, it has become the first choice for the treatment of cardiovascular and cerebrovascular diseases. The research report shows that the blood flow rate is the key influencing factor of restenosis after stent intervention in human body. If the blood flow rate is too slow, it is easy to deposit blood cells, lipids and other substances in the blood on the blood vessel wall, resulting in vascular blockage and restenosis over time. The work aims to study the effect of hexagonal micro pit texture vascular stents with different area occupancy rates on blood flow characteristics, and explore the role of micro texture in inhibiting stent restenosis. On the inner surface of tubular vascular stent, regular hexagonal micro pit textures with different area occupancy rates were designed, and the effect of micro textures with different area occupancy rates on the blood flow velocity in lumen was explored by Ansys finite element analysis method. The blood flow velocity in the lumen of the stent with micro texture was greater than that in the lumen of stent without micro texture. In a cardiac cycle, when the heart was contracted, the blood flow rate in the main flow zone of the micro-textured stent lumen with the occupancy rate of 31.9% was the fastest. When the heart was diastolic, the blood flow velocity in the main flow zone of the micro-textured stent lumen with the area occupancy rate of 11.2% was the fastest. At the peak, the blood flow direction in the stent without micro texture was parallel to the axis direction of the stent and the blood flow direction in the micro-textured stent produced radial runout and disturbance, the blood flow velocity produced radial component, and the blood near the wall showed disturbance and unstable flow. As the micro-textured area occupancy rate increased, more blood disturbed on the wall. At a steady condition, the blood near the wall flew back, and the blood flowing normally in the lumen of the stent without micro texture formed a vortex with the blood in the reflux area. The larger the area occupancy rate was, the more obvious the vortex was. The vortex changed the sliding friction between the blood and the wall into rolling friction, which reduced the resistance in the process of blood flow. The micro texture of the inner wall of the stent can reduce the resistance of blood adhesion and flow, improve the blood flow velocity, and make the blood near the wall better mixed, which is beneficial to improving the blood flow state, reducing the probability of restenosis and prolonging the normal service life of the stent. |
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