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Physiological fluid mechanics of intestine

Research Project

Project/Area Number 18K18817
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 19:Fluid engineering, thermal engineering, and related fields
Research InstitutionKobe University

Principal Investigator

Imai Yohsuke  神戸大学, 工学研究科, 教授 (60431524)

Project Period (FY) 2018-06-29 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords消化器系バイオメカニクス / 計算バイオメカニクス / 計算力学 / 数値流体力学 / 電気生理学
Outline of Final Research Achievements

We have developed a numerical model of “Rectosigmoid brake”. We constructed a geometry model of the large intestine based on medical imaging data. We gave retrograde waves to the geometry model, where the waves initiated at the rectosigmoid, and travelled along the sigmoid colon. We applied the cumulant lattice Boltzmann method and the adaptive subdomain method for computational fluid dynamics simulation. We showed that pressure at the rectum was decreased by the retrograde waves.

Academic Significance and Societal Importance of the Research Achievements

健康な場合,食後に大腸の腸管運動が活発になるが,便通に症状がある患者では,腸管運動に変化が生じていない.大腸の腸管運動には,順行性の運動と逆行性の運動がある.このうち逆行性の運動は直腸への便の輸送を制御していると考えられている.これが「Rectosigmoid brake」と呼ばれる概念であるがその実体は十分明らかでなかった.オークランド大学の電気生理学解析により,結腸と直腸のジャンクションの領域において,直腸S状部を起源とする逆行性の運動が発生していることが分かってきた.本研究では,この現象を数値解析するため,世界で初となる実形状の大腸に対する内容物輸送の計算モデルを開発した.

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (6 results)

All 2019 2018 Other

All Int'l Joint Research (1 results) Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (2 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results) Remarks (1 results)

  • [Int'l Joint Research] オークランド大学(ニュージーランド)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Quantification of gastric emptying caused by impaired coordination of pyloric closure with antral contraction: a simulation study2019

    • Author(s)
      Ishida S, Miyagawa T, O'Grady G, Cheng LK, Imai Y
    • Journal Title

      J Roy Soc Interface

      Volume: 16 Issue: 157 Pages: 20190266-20190266

    • DOI

      10.1098/rsif.2019.0266

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A computational fluid dynamics simulation of liquid swallowing by impaired pharyngeal motion: bolus pathway and pharyngeal residue2019

    • Author(s)
      Ohta Jun、Ishida Shunichi、Kawase Tetsuaki、Katori Yukio、Imai Yohsuke
    • Journal Title

      American Journal of Physiology-Gastrointestinal and Liver Physiology

      Volume: 317 Issue: 6 Pages: G784-G792

    • DOI

      10.1152/ajpgi.00082.2019

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Presentation] Computation of complex physiological flows2019

    • Author(s)
      Yohsuke Imai
    • Organizer
      Osaka University MEI-Center Summer School 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 体の中の複雑な流れを計算する2018

    • Author(s)
      今井陽介
    • Organizer
      第90回バイオメクフォーラム(豊中市)
    • Related Report
      2018 Research-status Report
    • Invited
  • [Remarks] Advanced Fluid Engineering, Kobe University

    • URL

      http://www.lab.kobe-u.ac.jp/eng-afe/index.html

    • Related Report
      2019 Annual Research Report

URL: 

Published: 2018-07-25   Modified: 2021-02-19  

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