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Hemodynamic Analysis of a Microanastomosis Using Computational Fluid Dynamics.
Shunjiro Yagi1, Takafumi Sasaki2, Takahiro Fukuhara3
1Department of Plastic and Reconstructive Surgery, Tottori University Hospital, Yonago 683-8504, Japan.
Yonago Acta Medica
|November 30, 2020
Summary
Computational fluid dynamics (CFD) analysis of microanastomosis reveals that ideal sutures minimize flow disruption. High oscillatory shear index (OSI) at suture bases suggests a higher risk of thrombus formation, emphasizing the importance of tight knots.
Area of Science:
- Biomedical Engineering
- Fluid Dynamics
- Microsurgery
Background:
- Debate exists regarding optimal techniques for vascular pedicle anastomosis in free flap transfer.
- Computational fluid dynamics (CFD) offers advanced capabilities for analyzing microvessel blood flow.
- This study applies CFD to investigate hemodynamics within microanastomoses.
Purpose of the Study:
- To analyze hemodynamics in microanastomoses using CFD.
- To evaluate the impact of suture placement on blood flow characteristics.
- To identify factors influencing thrombus formation risk in microanastomoses.
Main Methods:
- A fluid domain model simulating microvessels with anastomosis was created.
- Venous waveform data represented inlet flow conditions, with blood simulated as the fluid.
- Streamlines (SL), wall shear stress (WSS), and oscillatory shear index (OSI) were analyzed.
Main Results:
- Sutures caused noticeable disruption to streamlines (SL) as they passed.
- Maximum wall shear stress (WSS) of 13.37 Pa was recorded at exposed suture peaks.
- The highest oscillatory shear index (OSI) of 0.182 was found at the base of the anastomosis.
Conclusions:
- Minimizing suture disruption to streamlines is key for ideal microanastomosis.
- High OSI at suture bases indicates a greater likelihood of thrombus formation.
- Tight suture knots are crucial for successful microanastomosis outcomes.
