Hemodynamic Analysis of a Microanastomosis Using Computational Fluid Dynamics

• Yagi Shunjiro

  Department of Plastic and Reconstructive Surgery, Tottori University Hospital, Yonago 683-8504, Japan

• Sasaki Takafumi

  Cardio Flow Design, Inc., Chiyoda 102-0075, Tokyo, Japan

• Fukuhara Takahiro

  Division of Otolaryngology, Head and Neck Surgery, Department of Sensory and Motor Organs, School of Medicine, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan

• Fujii Kaori

  Department of Plastic and Reconstructive Surgery, Tottori University Hospital, Yonago 683-8504, Japan

• Morita Maki

  Department of Plastic and Reconstructive Surgery, Tottori University Hospital, Yonago 683-8504, Japan

• Suyama Yoshiko

  Department of Plastic and Reconstructive Surgery, Tottori University Hospital, Yonago 683-8504, Japan

• Fukuoka Kohei

  Department of Plastic and Reconstructive Surgery, Tottori University Hospital, Yonago 683-8504, Japan

• Nishino Teruyasu

  Cardio Flow Design, Inc., Chiyoda 102-0075, Tokyo, Japan

• Hisatome Ichiro

  Department of Genetic Medicine and Regenerative Therapeutics, Graduate School of Medical Sciences, Tottori University, Yonago 683-8503, Japan

Abstract

Background Technical issues in free flap transfer, such as the selection of recipient vessels and the positioning and method of anastomosis of the vascular pedicle, have been the subject of vigorous debate. Recent developments in computational fluid dynamics (CFD) have enabled the analysis of blood flow within microvessels. In this study, CFD was used to analyze hemodynamics in a microanastomosis. Methods In the fluid calculation process, the fluid domain modelizes microvessels with anastomosis. The inlet flow conditions were measured as venous waveform, and the fluid is simulated as blood. Streamlines (SL), wall shear stress (WSS), and oscillatory shear index (OSI) at the anastomosis were visualized and analyzed for observing effects from the flow field. Results Some flow disruption was evident as the SL passed over the sutures. The maximum recorded WSS was 13.37 Pa where the peak of a suture was exposed in the lumen. The local maximum value of the OSI was 0.182, recorded at the base of the anastomosis on the outflow side. Conclusion In the ideal anastomosis, the SL is disrupted as little as possible by the sutures. The WSS indicated that thrombus formation is unlikely to occur at suture peaks, but more likely to occur at the base of sutures, where the OSI is high. Tight suture knots are important in microanastomosis.

Journal

• Yonago Acta Medica

  Yonago Acta Medica 63 (4), 308-312, 2020

  Tottori University Medical Press

Keywords

• computational fluid dynamics
• computational modeling
• microsurgery
• reconstruction
• sutured

Details

• CRID: 1391412326420111744
• NII Article ID: 130007942214
• NII Book ID: AA00892882
• DOI: 10.33160/yam.2020.11.013
• ISSN: 13468049
• ISSN: 05135710
• Web Site: https://repository.lib.tottori-u.ac.jp/records/4751
• Web Site: https://www.jstage.jst.go.jp/article/yam/63/4/63_2020.11.013/_pdf
• Web Site: https://search.jamas.or.jp/link/ui/2021233692
• Text Lang: en
• Data Source:
  • JaLC
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed