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Development of a new evaluation method for corrosion properties of biodegradable metals for the risk assessment in their efficacy and safety as medical devices

Research Project

Project/Area Number 23K25242
Project/Area Number (Other) 22H03988 (2022-2023)
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeMulti-year Fund (2024)
Single-year Grants (2022-2023)
Section一般
Review Section Basic Section 90140:Medical technology assessment-related
Research InstitutionNational Institute for Materials Science

Principal Investigator

Yamamoto Akiko  国立研究開発法人物質・材料研究機構, 高分子・バイオ材料研究センター, 上席研究員 (20343882)

Co-Investigator(Kenkyū-buntansha) 今井 啓道  東北大学, 医学系研究科, 教授 (80323012)
清水 良央  東北大学, 医学系研究科, 大学院非常勤講師 (30302152)
Project Period (FY) 2024-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2024: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2023: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2022: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Keywordsレギュラトリーサイエンス / 生体吸収性金属材料 / 炎症反応 / インピーダンス / 疑似組織 / 分解特性 / リスク評価 / インピーダンス測定 / 拡散速度 / 生体内分解性材料 / 生物学的安全性 / 電気化学測定 / 物質拡散
Outline of Research at the Start

生体内で分解・消失する金属材料としてMgやZn、Feの合金の医療応用が期待されている。これらの材料による治療の成否には、患者体内における分解速度が大きな影響を及ぼす。よって、臨床使用時のリスク低減には分解特性の適切な評価が重要であるが、動物を用いた評価法には限界がある。そこで、体内における分解速度に大きな影響を及ぼす因子として組織中血流量(拡散速度)と異物反応を想定し、これらを考慮したin vitro評価法を開発する。具体的には、1)疑似組織中の生体高分子濃度制御による血流量の模擬、2)免疫細胞の活性化状態制御による炎症反応の再現、により、腐食挙動に及ぼす影響を明らかにする。

Outline of Final Research Achievements

Success in biomedical application of biodegradable metals depends on their corrosion/degradation rates in patient bodies. It is necessary to appropriately evaluate corrosion properties of biodegradable metals for reduction of risks in their clinical application. Therefore, we developed new in vitro evaluation methods for biodegradable metals considering blood flow and inflammation as influencing factors of their corrosion properties in patient bodies.
In order to simulate the difference in blood flow inside the tissue, we employed model tissues with different ion and gas diffusion rates. Electrochemical impedance spectroscopy revealed the decrease of corrosion rate in the model tissue. For the recreation of the inflammation in the tissue, we employed macrophages with different activation levels. The electrochemical impedance spectroscopy with hyper-activated macrophages demonstrated acceleration in corrosion rate of AZ31 alloy.

Academic Significance and Societal Importance of the Research Achievements

ステントや骨接合材は損傷部位の修復後には不要になるが、現行の非吸収性デバイスの除去には再手術が必要であり、患者の肉体的・金銭的負担であった。生体内分解性金属材料デバイスの実用化は、これらの負担の解消に有用である。本研究で開発した血流量・炎症反応を模擬した評価法は、生体内分解性金属材料の患者体内における腐食挙動の理解に繋がり、臨床使用時のリスク評価ならびにデバイス開発・実用化に資する。
材料の生体内腐食特性評価において、組織中物質拡散速度を考慮した例はない。また免疫細胞の活性化による生体分解性金属材料の腐食挙動を明らかにした例もなく、いずれも貴重な成果であり学術的意義が高い。

Report

(4 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Annual Research Report
  • 2022 Annual Research Report
  • Research Products

    (15 results)

All 2025 2024 2022 Other

All Int'l Joint Research (2 results) Journal Article (7 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 7 results,  Open Access: 6 results) Presentation (6 results) (of which Int'l Joint Research: 2 results)

  • [Int'l Joint Research] Indian Institute of Technology Indore(インド)

    • Country Name
      INDIA
    • Counterpart Institution
      Indian Institute of Technology Indore
    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] Indian Institute of Technology Indore(インド)

    • Country Name
      INDIA
    • Counterpart Institution
      Indian Institute of Technology Indore
    • Related Report
      2023 Annual Research Report
  • [Journal Article] Investigating the Effect of Thickener Concentrations on the Corrosion Behavior of Pure Mg2025

    • Author(s)
      Sahu Manas Ranjan、Yamamoto Akiko
    • Journal Title

      Journal of Biomedical Materials Research Part A

      Volume: 113 Pages: 1-12

    • DOI

      10.1002/jbm.a.37878

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effect of diffusion in the model tissue on biocorrosion of Mg alloys2025

    • Author(s)
      Sahu Manas Ranjan、Yamamoto Akiko
    • Journal Title

      Colloids and Surfaces B: Biointerfaces

      Volume: 251 Pages: 114621~114621

    • DOI

      10.1016/j.colsurfb.2025.114621

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] An overview of the recent developments in biodegradable Mg-Zn alloy2025

    • Author(s)
      Sahu Manas Ranjan、Yamamoto Akiko
    • Journal Title

      Journal of Magnesium and Alloys

      Volume: 13 Pages: 486~509

    • DOI

      10.1016/j.jma.2025.01.011

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The effect of severe surface deformation on microstructure refinement, corrosion, and biocompatibility of Mg5Zn0.2Ca alloy2025

    • Author(s)
      Kumbhar Nilesh K.、Yamamoto Akiko、Wadhonkar Khandu、Baig Mirza S.、Hosmani Santosh S.
    • Journal Title

      Journal of Alloys and Compounds

      Volume: 1010 Pages: 178259~178259

    • DOI

      10.1016/j.jallcom.2024.178259

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effect of hematoma on early degradation behavior of magnesium after implantation2024

    • Author(s)
      Yusa Yu、Shimizu Yoshinaka、Hayashi Masanobu、Aizawa Takayuki、Nakahara Takahiro、Ueno Takahiro、Sato Akimitsu、Miura Chieko、Yamamoto Akiko、Imai Yoshimichi
    • Journal Title

      Biomedical Materials

      Volume: 19 Pages: 055043~055043

    • DOI

      10.1088/1748-605X/ad7085

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] In vitro analysis of insoluble salt formation mechanism associated with Mg corrosion---variations depending on the diffusion environment in model tissue2024

    • Author(s)
      Hayashi Masanobu, Yamamoto Akiko, Aizawa Takayuki, Yusa Yu, Shimizu Yoshinaka, Imai Yoshimichi
    • Journal Title

      Biomedical Materials

      Volume: 19 Pages: 025010~025010

    • DOI

      10.1088/1748-605X/ad1d7f

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of a Model System for Gas Cavity Formation Behavior of Magnesium Alloy Implantation2022

    • Author(s)
      Yamamoto Akiko、Kikuta Akemi
    • Journal Title

      ACS Biomaterials Science & Engineering

      Volume: 8 Pages: 2437~2444

    • DOI

      10.1021/acsbiomaterials.1c01429

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] Investigating the effect of thickener concentrations on the corrosion behaviour of Pure Mg2024

    • Author(s)
      Manas Ranjan Sahu, Akiko Yamamoto
    • Organizer
      12th World Biomaterials Congress (WBC 2024)
    • Related Report
      2024 Annual Research Report 2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A new approach for the estimation of biodegradable scaffold volume by microfocus X-ray CT observation2024

    • Author(s)
      Akiko Yamamoto, Akemi Kikuta
    • Organizer
      12th World Biomaterials Congress (WBC 2024)
    • Related Report
      2024 Annual Research Report 2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of diffusion in the model tissue on biocorrosion of Mg alloys2024

    • Author(s)
      Manas Ranjan Sahu, Akiko Yamamoto
    • Organizer
      日本バイオマテリアル学会シンポジウム2024
    • Related Report
      2024 Annual Research Report
  • [Presentation] 生体吸収性金属材料の腐食減量推定のためのX 線CT 像解析法の検討2024

    • Author(s)
      山本玲子、菊田明美
    • Organizer
      日本バイオマテリアル学会シンポジウム2024
    • Related Report
      2024 Annual Research Report
  • [Presentation] マグネシウムの生体内分解挙動解析における疑似生体組織埋植の有用性に関する検討2022

    • Author(s)
      相澤貴之 遊佐優 林昌伸 及川美穂 佐野有哉 山本 玲子 宮崎雅矢 中原崇博 上野太裕 清水良央 今井啓道
    • Organizer
      第31回日本形成外科学会基礎学術集会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 生体吸収性金属材料の腐食特性評価のための疑似組織の開発2022

    • Author(s)
      山本 玲子 菊田 明美
    • Organizer
      第44回日本バイオマテリアル学会大会
    • Related Report
      2022 Annual Research Report

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Published: 2022-04-19   Modified: 2026-01-16  

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