Researchers

OHMASA Mitsushi

OHMASA Mitsushi: Associate Professor

Faculty	Department of Human Factors Engineering and Environmental Design / Graduate School of Biology-Oriented Science and Technology
Researchmap	https://researchmap.jp/read0014053

Education and Career

Education

- 1986 , Osaka University, Faculty of Engineering,
- 1986 , Osaka University, School of Engineering,
- 1991 , Osaka University, Graduate School, Division of Engineering,
- 1991 , Osaka University, 工学研究科,

Academic & Professional Experience

Apr. 2017 - Today , Kindai University Faculty of Biology-Oriented Science and Technology Department of Human Factors Engineering and Environmental Design 准教授
Apr. 2010 - Mar. 2017 , Kindai University 生物理工学部人間工学科准教授
Apr. 2007 - Mar. 2010 , Kindai University 生物理工学部生体機械工学科准教授
Apr. 2006 - Mar. 2007 , Kindai University 生物理工学部生体機械工学科助教授
Apr. 2003 - Mar. 2006 , Kindai University 生物理工学部生体機械工学科講師
Apr. 1997 - Mar. 2003 , Kindai University 生物理工学部基礎機械工学科講師
Apr. 1991 - Mar. 1997 , Osaka University Research Assistant

Research Activities

Research Areas

Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Design engineering
Nanotechnology/Materials, Structural and functional materials
Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Machine materials and mechanics

Published Papers

Estimation of the effects of inset heights and slit configurations in an acetabular cup on the pull-out behavior of an artificial hip joint with a structure for preventing dislocation using finite element analysis
Yuki Kawamura; Mitsushi Ohmasa; Takayuki Kobayashi; Yoshihito Matsufuji; Makoto Saito; Yoshinori Uwa; Saiji Washio; Ei Yamamoto
Medical and Biological Engineering and Computing 58 (10) , 2587-2601, 1, Oct. 2020 , Refereed
Influence of Seating Surface Rising Trajectory on the Standing Burden in Stand-Assist Chairs
Tomiyama, H; Hirokawa, N; Kitayama, I; Ohmasa, M
Advanced Experimental Mechanics 4 , 163-167, Aug. 2019 , Refereed
Effectiveness of a balance chair for maintaining a seating posture during light-duty work
Noriyasu Hirokawa; Takahiro Tanaka; Ken’ichi Itose; Tadashi Shibue; Takashi Hayami; Toru Sawai; Mitsushi Ohmasa
Advances in Intelligent Systems and Computing 489 , 213-224, 2016 , Refereed

知っておきたい最新科学の基本用語 , 左巻健男; 大政光史 , 「工学・技術」（p.131-177） , 「工学・技術」（p.131-177） , (株)技術評論社 , May. 2009
系統的に学ぶ中学物理 , 左巻健男; 大政光史; 高橋純; 中屋敷勉; 舩田優 , 第６章「仕事とエネルギー」(p.151-172) , 第６章「仕事とエネルギー」(p.151-172) , (株)文理 , Feb. 2009
勉強のやり方がわかる , 藤田哲也; 井上智義; 大政光史 , 「自然科学系の学び方」(p.112-113) , 「自然科学系の学び方」(p.112-113) , 朝日新聞社 , Apr. 2004

構成要素の少ない脱臼防止機構付き人工股関節の提案 , 山本衛; 川村勇樹; 大政光史 , 第49 回日本臨床バイオメカニクス学会 , Nov. 2022
Estimation of the effects of inset height and head-neck ratio on the dislocation moments in an artificial hip joint with the structure for prevention dislocation using finite element analysis , Kawamura, Y; Ohmasa, M; Yamamoto, E , The 9th World Congress of Biomechanics , 13, Jul. 2022
脱臼防止機構付き人工股関節の各種形状パラメータとインピンジメント挙動との関係 , 川村勇樹; 大政光史; 山本衛 , 第61回日本生体医工学会大会 , 28, Jun. 2022

Mechanical behavior of artificial hip joints with the structure to prevent dislocation under moments , Kawamura Yuki; Ohmasa Mitsushi; Yamamoto Ei , Transactions of Japanese Society for Medical and Biological Engineering , Annual59 , Abstract , 501 , 501 , 2021
Summary:Total hip arthroplasty used by an artificial hip joint is frequently performed to treat hip joint diseases such as the osteoarthritis and the osteonecrosis of the femoral head. However, the joint dislocation easily occurs due to the muscle resection after the surgery. An artificial hip joint with a structure for preventing dislocation was proposed in this study. The acetabular cup of the joint has an inset part which is defined as the cup part over hemisphere line of the artificial head. In the present study, the dislocation moment was estimated using the finite element method. The rotational displacement was applied to the artificial head to obtain the relationship between the dislocation moment and inset height. Analytical results showed that dislocation moment increased with the increase of the inset height. We have an insight into the optimal structure of artificial hip joint to prevent dislocation under moments.
Mechanical Behavior of an Artificial Hip Joint with the Structure for Preventing Dislocation in Case of Impingement , YAMAMOTO Ei; KAWAMURA Yuki; OHMASA Mitsushi , The Proceedings of Mechanical Engineering Congress, Japan , 2021 , J241-08 , 2021
Summary:An effective treatment for hip osteoarthritic patients is total hip arthroplasty (THA). THA is a surgical procedure in which a painful osteoarthritic hip joint is replaced with an artificial hip joint. Joint dislocation is one of the most critical problems not only for human but also for canine THA. We have newly proposed an artificial hip joint which has a simple structure to prevent joint dislocation. The proposed joint has the structure with a femoral head partially covered with an acetabular cup. In the present study, the dislocation moment due to the impingement was assessed using finite element analysis. The dislocation moment was approximately 415, 166, and 8 N•mm in the case of the 1.5, 1.0, and 0.5 mm inset height model, respectively. This result indicates that the acetabular cup with the structure for preventing dislocation has an ability to resist the excess rotational movement which induces joint impingement.
Elastic-plastic analysis considered residual stresses in the acetabular cup to estimate the pull-out force in the artificial hip joint with the structure for preventing dislocation , KAWAMURA Yuki; OHMASA Mitsushi; YAMAMOTO Ei , The Proceedings of the JSME Conference on Frontiers in Bioengineering , 2020.31 , 1B30 , 2020