Temporal analysis of the fistula at three anastomosis angles of 45, 90, and 135 degrees

Document Type : Research Article

Authors

1 tarbiat modares

2 tarbiat modares university

Abstract

Selection of the appropriate anastomosis angle for the creation of a fistula for surgery is very important. Therefore, in this study, three anastomosis angles of 45, 90, and 135 degrees, representing acute and obtuse angles, are designed and simulated in a complete pulsation cycle. Carreau non-Newtonian blood model is used and the flow is considered as incompressible flow. Finally, after modeling, important parameters such as mean shear stress on the fistula wall, oscillatory shear index, relative residence time, and maximum pressure drop are extracted and compared at different angles. After comparing the results, it is observed that the time average wall shear stress and the range of the high shear stress at anastomosis angle of 135 degree is lower than the two other angles and the probability of thrombosis disease in this angle is reduced. 80% of fistula failure is caused by thrombosis disease, therefore this angle is chosen as the most appropriate angle for fistula creation. Based on the results of the relative residence time, it is found that at all three angles of anastomosis, the right branch of the fistula and flow separation sites have a probability of sedimentation and it decreases at an angle of 135 degree. This angle also has the lowest pressure drop between the main inlet and the fistula outlet.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 3 (Special Issue)
June 2021
Pages 1799-1814

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