Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (03): 17-23.doi: 10.13475/j.fzxb.20211104607

• Invited Column: Biomedical Textiles • Previous Articles     Next Articles

Numerical simulation of hemodynamics in spiral artificial blood vessel

LI Tianhua1, LI Jingjing2, ZHANG Keqin1,3, ZHAO Huijing1,3, MENG Kai1,3()   

  1. 1. College of Textile and Clothing Engineering, Soochow University, Suzhou, Jiangsu 215021, China
    2. Institute of Cardiovascular Diseases, Soochow University, Suzhou, Jiangsu 215021, China
    3. National Engineering Laboratory for Modern Silk (Suzhou), Suzhou, Jiangsu 215123, China
  • Received:2021-11-07 Revised:2021-12-30 Online:2022-03-15 Published:2022-03-29
  • Contact: MENG Kai E-mail:mk2009@suda.edu.cn

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Abstract:

Low wall shear stress (WSS) is one of the mechanical causes for restenosis after vascular transplantation. In order to investigate the effect of swirling flow on hemodynamics such as WSS, an end-to-side anastomotic model between the spiral artificial blood vessel and the host vessel was constructed. The formation of swirling flow was confirmed by finite element numerical simulation, and the effects of anastomotic angle, spiral radius and pitch on WSS in the toe of the model (an area prone to intimal hyperplasia) were discussed. The results show that the lowest value of the time average wall shear stress (TAWSS) in a cardiac cycle is 1.2 Pa when the anastomotic angle is 30°, which are higher than the values of 0.3 Pa (45°) and 0.4 Pa (60°) respectively. When the spiral radius is 1.0, 1.5 and 2.0 mm, the corresponding minimum TAWSS is 0.69, 0.68 and 1.06 Pa respectively, which shows larger spiral radius is more favorable to improve the WSS. When the pitch gradually decreases from 96 mm to 48 and 32 mm, the minimum TAWSS gradually increases from 0.77 Pa to 1.06 and 1.30 Pa. It shows that when the pitch is small, the minimum TAWSS is high.

Key words: medical textiles, artificial blood vessel, spiral blood vessel, swirling flow, wall shear stress, vascular transplantation

CLC Number: 

  • TS101.2

Fig.1

Schematic diagram of spiral artificial blood vessel"

Fig.2

Schematic diagram of end to side anastomotic model"

Tab.1

Geometric parameter values of model"

血管
直径
D/mm		 直管
长度
H/mm		 宿主血管
长度Ls/
mm		 螺旋型血
管长度
Lx/mm		 螺旋半径
Rx/mm		 螺距
L/mm		 吻合角/
(°)
4 8 80 64 1.0、1.5、2.0 96、48、32 30、45、60

Fig.3

Pulsating velocity curve"

Fig.4

Streamline diagram of velocity field (t=164 ms)"

Fig.5

Tangential velocity field on cross section of vascular model (t=164 ms)"

Fig.6

Velocity distribution on zx-plane (t=164 ms)"

Fig.7

WSS distribution of two vascular models (t=164 ms)"

Fig.8

Curve of TAWSS on toe line"

Fig.9

WSS distribution of spiral vascular model at different anastomotic angles (t=164 ms)"

Fig.10

TAWSS curves on toe line at different anastomotic angles"

Fig.11

WSS distribution of vascular model with different spiral radius (t=164 ms)"

Fig.12

TAWSS curves on toe line at different spiral radius"

Fig.13

WSS distribution of vascular model with different pitch (t=164 ms)"

Fig.14

TAWSS curves on toe line at different spiral pitch"

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