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YARIMITSU Seido Last modified date:2022.06.16

Associate Professor / Department of Mechanical Engineering Faculty of Engineering
Department of Mechanical Engineering
Faculty of Engineering

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Machine Elements and Design Engineering Laboratory, Kyushu University .
Academic Degree
Ph.D. Eng.
Country of degree conferring institution (Overseas)
Field of Specialization
Biotribology, Biomechanics
ORCID(Open Researcher and Contributor ID)
Total Priod of education and research career in the foreign country
Outline Activities
・Lubrication mechanism of articular cartilage
・Hydrogel for Tribo-material
・Biomechanics of articular cartilage and menisci
・Friction and wear of artificial joint materials
Research Interests
  • Development of hydrogel with high water content as Tribo-material
    keyword : Hydrogel, Super-lubricity
  • Elucidation of lubrication mechanisms of natural articular cartilage
    keyword : Articular cartilage, Boundary lubrication, Biphasic lubrication, Hydration lubrication
  • Evaluation of friction and wear properties of artificial joint materials
    keyword : Artificial joint, wear, friction
  • Influences of synovia constituents on friction and wear properties of artificial cartilage materials
    keyword : Artificial cartilage, wear, friction, synovial joint fluid
Academic Activities
1. Seido Yarimitsu, Kei Ito, Hiromichi Fujie, Influence of collagen fibre orientation on the frictional properties of articular cartilage, Biosurface and Biotribology, 10.1049/bsb2.12005, 2021.05.
2. Seido Yarimitsu, Ayumi Yoshida, Saori Sasaki, Teruo Murakami, Atsushi Suzuki, Evaluation of lubrication property of poly(vinyl alcohol) hybrid gel for artificial articular cartilage, Tribology Online, 10.2474/trol.11.360, 11, 2, 360-365, 2016.04.
3. Seido Yarimitsu, Saori Sasaki, Teruo Murakami, Atsushi Suzuki, Evaluation of lubrication properties of hydrogel artificial cartilage materials for joint prosthesis, Biosurface and Biotribology, 10.1016/j.bsbt.2016.02.005, 2, 1, 40-47, 2016.03.
4. Seido Yarimitsu, Kazuhiro Nakashima, Yoshinori Sawae, Teruo Murakami, Influence of Phospholipid and Protein Constituents on Tribological Properties of Artificial Hydrogel Cartilage Material, Journal of Biomechanical Science and Engineering, Vol.8, No.3, 257-267, 2013.09.
5. Influences of Synovia Constituents on Frictional Behavior of Artificial Cartilage Material and Formation of Boundary Lubricating Film
Frictional behavior of poly (vinyl alcohol)(PVA) hydrogel as artificial articular cartilage was examined in reciprocating motion in lubricants that contain albumin, gamma-globulin, L-alpha dipalmitoyl phosphatidylcholine (DPPC) and hyaluronic acid (HA). Influences of synovia constituents on forming boundary film and boundary lubrication ability for PVA hydrogel were investigated by in situ fluorescent observation on forming boundary film, atomic force microscopy and infrared spectroscopy. Under the coexistence of proteins and DPPC, DPPC contributed to reduce friction of PVA hydrogel. Albumin-DPPC composite film and smooth film formed by DPPC especially reduced friction. When HA and DPPC coexist in the lubricants, HA-DPPC composite film with micron-ordered pattern was formed and it reduced friction remarkably. Through the researches on the influences of synovia constituents on boundary lubricating ability for PVA hydrogel, it was shown that albumin and DPPC function as low shearing resistance components in boundary film and gamma-globulin has ability to stabilize boundary film and enhances the formation of boundary film. HA has high ability of water retention and plays a part in reduction of friction and enhancement of forming boundary film that has the characteristics of gel-like layer..
6. Seido Yarimitsu, Kazuhiro Nakashima, Yoshinori Sawae, Teruo Murakami, Influences of lubricant composition on forming boundary film composed of synovia constituents, TRIBOLOGY INTERNATIONAL, 10.1016/j.triboint.2008.11.005, 42, 11-12, 1615-1623, 2009.12, In this study, the influences of lubricant composition on adsorption behavior of proteins and stability of protein boundary film were investigated by using total internal reflection fluorescence microscopy (TIRFM). In addition, the adsorption of hyaluronic acid (HA) on rubbed surface was also observed. It was found that the forming of bottom layer of protein boundary film mainly composed of gamma-globulin is a key factor to form a stable boundary film and the friction-induced enhancement of forming protein boundary film occurred in appropriate lubricant. In addition, the adsorption of HA on rubbed surface was enhanced by coexistence with gamma-globulin and frictional action. It was indicated that a gel-like film is formed due to the introduction of hydrophilic HA molecules into boundary film and it contributes to reduce friction. (C) 2008 Elsevier Ltd. All rights reserved..
7. YARIMITSU Seido, NAKASHIMA Kazuhiro, SAWAE Yoshinori, MURAKAMI Teruo, Study on the Mechanisms of Wear Reduction of Artificial Cartilage through in Situ Observation on Forming Protein Boundary Film, Tribol Online (Web), 10.2474/trol.2.114, 2, 4, 114-119 (J-STAGE), 2007.12.
1. Seido Yarimitsu, Teruo Murakami, Atsushi Suzuki, Influence of Surface Morphology on Tribological Properties of Poly(vinyl alcohol) Hydrogels as Artificial Cartilage, 5th International Conference on BioTribology, 2021.04.
2. Seido Yarimitsu, Teruo Murakami, Atsushi Suzuki, Superior Tribological Properties of Poly(Vinyl Alcohol) Hydrogels as Artificial Articular Cartilage, International Tribology Conference 2019 Sendai, 2019.09.
3. Seido Yarimitsu, Naoya Hashimoto, Teruo Murakami, Atsushi Suzuki, Hiromichi Fujie, Influence of Dehydration by Pre-loading on Tribological Property of Hydrogel Artificial Cartilage and Articular Cartilage, 6th World Tribology Congress 2017, 2017.09.
4. Seido Yarimitsu, Saori Sasaki, Teruo Murakami, Atsushi Suzuki, Development of Hydrogel Artificial Cartilage Materials for Joint Prosthesis, APA International Conference on Advanced Polymers, Biomaterials, Bioengineering & Nano Drug Delivery, 2016.09.
Membership in Academic Society
  • The Japan Society of Mechanical Engineers
  • Japanese Society of Tribologists
  • Japanese Society for Clinical Biomechanics
  • Japan Society of Biotribology