Faculty Profiles - ODA Masafumi

Papers - ODA Masafumi

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Development of Work-sheet for Setup of Issue in collaboration with Business and Academic Manager on Internship for Problem Solving

Takasawa, Yojiro, Oda, Masafumi, Kourakata, Itaru, Ueda, Yasutaka, Nakamura, Fumi

10 10 - 15 2023.3

Bone fracture analysis for calcaneus

ABE Yoshitaka, SASAGAWA Keisuke, ODA Masafumi, SHIOTA Naofumi

The Proceedings of Mechanical Engineering Congress, Japan 2022 J026-01 2022

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Calcaneus fractures are injuries caused by sprains, fall down, falls from high places, or traffic accidents and characterized by the tendency for pain to remain. One of the causes of this pain is poor reduction. In the Essex-Lopresti classification, which is one of the calcaneus fracture classifications, the fracture patterns of calcaneus fractures are roughly divided into two types, tongue type and joint depression type, and it has been suggested that the fracture patterns differ depending on the mechanical condition at the time of injury. Thus, it is important to perform accurate reduction by clarifying the relationships between the difference in mechanical condition at the time of injury and the fracture pattern, which is thought to lead to early healing. Therefore, in this study, it was investigated whether the fracture pattern as seen in the calcaneus fracture classification can be reproduced by considering bone fracture in the finite element analysis for the calcaneus. Furthermore, we investigated the usefulness of this analysis method for clarifying the relationships between the difference in mechanical condition at the time of injury and the fracture pattern. As a result, we indicated that the fracture pattern corresponding to calcaneus fracture classification could be reproduced by bone fracture analysis. In addition, it was suggested that this analysis method is useful for clarifying the relationships between the difference in mechanical condition at the time of injury and the fracture pattern, since the results based on this analysis was consistent with the contents described in the Essex-Lopresti classification.

DOI： 10.1299/jsmemecj.2022.j026-01

Reflections and Prospects; Problem-based Learning and Co-op Education in Undergraduate Engineering Programs focusing on Incongruity between Student’s Major and Company’s Field of Activity

小浦方格, 尾田雅文, 若林悦子, 高澤陽二郎

The Proceedings of Mechanical Engineering Congress, Japan 2022 S401 - 13 2022

骨破壊を考慮した大腿骨転子部骨折のメカニズム解析

阿部佳峻, 笹川圭右, 尾田雅文, 佐藤朗, 原利昭

臨床バイオメカニクス 42 21 - 27 2021.10

Language：Japanese Publisher：日本臨床バイオメカニクス学会

大腿骨転子部骨折には多様な骨折パターンが存在している。多くの臨床的分類は骨折線の位置や粉砕の程度により分類されている。しかし、なぜこのような骨折になるかについては言及されていない。そこで、外力の加わり方(転倒状況)により骨折パターンが異なることを有限要素(FE)解析により解明することを試みた。転倒を想定したFE解析は、従来、主に静的に解析した例が多く、骨折線の進展や骨片の転位等を含めた検討は困難である。したがって、これら骨破壊過程の再現精度向上は解決を要する課題である。本研究は、大腿骨FEモデルを対象とし、転倒を想定した動的FE解析に骨破壊を考慮することで、転倒状況と骨折パターンの関係を調査した。本FE解析で得られた結果は、3D-CT中野分類の一部と類似した。したがって、本手法は、転倒状況と骨折パターンの関係を調べるのに有効であることが示唆された。(著者抄録)

Examination of femoral trochanteric fracture pattern using bone fracture analysis

ABE Yoshitaka, SASAGAWA Keisuke, ODA Masafumi, SATO Akira

The Proceedings of Mechanical Engineering Congress, Japan 2021 J023-20 2021

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Elderly people with osteoporosis are injured proximal femur fracture by low energy forces of trauma such as falling from standing. Proximal femoral fracture is likely to reduce activities of daily living (ADL) and quality of life (QOL) because of loss of the walking ability of patients. Thus, early fracture healing is very important. Trochanteric fracture, which are classified as proximal femoral fracture, has a wide variety of fracture patterns for each patient. These fracture patterns are thought to be due to differences in patient-specific bone information such as bone mineral density (BMD) and bone morphology. The aim of this study is to reproduce the fracture line of trochanteric region by applying bone fracture to the dynamic finite element analysis (FEA) assuming a specific fall situation using FE model with subject-specific bone information. The fracture patterns of three subjects were investigated.

DOI： 10.1299/jsmemecj.2021.j023-20

Analysis of fracture pattern for intertrochanteric femur fracture

Yoshitaka ABE, Keisuke SASAGAWA, Masafumi ODA, Akira SATO

The Proceedings of Conference of Hokuriku-Shinetsu Branch 2021.58 D032 2021

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Elderly people are more likely to have the proximal femur fractures because of osteoporosis and so on, even with a slight external force due to a fall. Intertrochanteric fractures, which is one of the proximal femur fractures, have a wide variety of fracture patterns. A suitable treatment is required for each fracture pattern. To investigate the relationship between fall situation and fracture pattern leads to understand these fracture conditions and is important for early recovery. The aim of this study was to investigate the repeatability of the intertrochanteric fracture pattern using dynamic FE analyses in consideration of failure of bone element. As a result of the analysis, the fracture pattern of the intertrochanteric area of the femur similar to that of Type I, 3-part A of the 3DCT classification was obtained.

DOI： 10.1299/jsmehs.2021.58.d032

骨頭外反型や大腿骨転子貫通骨折と呼称される整復困難な転子部骨折についての破壊力学的考察

佐藤朗, 湊泉, 野崎あさみ, 原利昭, 笹川圭右, 尾田雅文

整形・災害外科 63 ( 12 ) 1713 - 1719 2020.11

Language：Japanese Publisher：金原出版(株)

＜文献概要＞骨頭外反型や転子貫通骨折と呼称される特殊な転子部骨折がある。その特徴は大転子と小転子の頂部を結ぶ骨折線を認め,通常の転子部骨折に認められる転子間窩の骨折を認めないことである。5年間に手術を行った転子部骨折267例中2例に本骨折を認めた。本骨折の3D-CTを破壊力学的に検討した。通常の転子部骨折では転倒し大転子部を強打すると,転子間窩外側部に圧縮応力が集中し骨折が発生する。ほぼ同時に頸部基部前内側部付近が引張応力により骨折していくと考えられる。本骨折では良好な骨質で大転子部に大きな衝撃負荷が加わると,頸部基部前内側部に引張応力により骨折が発生する。この骨折は,引張応力が集中する突出部(後方は小転子頂部から転子間稜,前方は転子間線)に沿って裂けていき,大転子頂部に達したと考えられる。衝撃的負荷による引張応力によって発生し完成された骨折であり,圧縮応力による転子間窩の骨折は発生しなかったと考えられる。

Investigation of fracture mechanism for calcaneus

TAKAOKA Go, SASAGAWA Keisuke, ODA Masafumi, SHIOTA Naofumi, ABE Yoshitaka

The Proceedings of Mechanical Engineering Congress, Japan 2020 J02116 2020

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The calcaneus, the heel bone at the foot, is one of the most important bones for weight bearing. This bone supports almost the entire weight of the body when it contacts on the ground. Younger people suffer calcaneus fractures due to larger external forces such as a fall form a height or an accident while driving. However, calcaneus fracture in the elderly are often suffered by small external forces. Calcaneus fracture in the elderly have increased in recent years. For the proper treatment of calcaneus fractures, it is important to understand the fracture mechanism. The purpose of this study was to examine the risk of fracture of the calcaneus by performing FE analysis. A finite element (FE) model of the calcaneus was constructed based on CT images of the foot, and FE analysis was performed under three load conditions.

DOI： 10.1299/jsmemecj.2020.j02116

大腿骨転子下骨折の骨折部固定性に及ぼす髄内釘長さの生体力学的評価

笹川圭右, 佐野匠, 尾田雅文, 塩田直史, 佐藤徹

臨床バイオメカニクス 40 45 - 52 2019.10

Language：Japanese Publisher：日本臨床バイオメカニクス学会

転子下骨折の治療において、適切な髄内釘インプラントの長さを選択するためには、骨折治療への影響を力学的・臨床的の双方から検討を行う必要がある。本研究では、転子下骨折の骨折部固定性について、髄内釘インプラントの長さによる影響を有限要素(FE)解析によって比較検討することを目的とした。転子下骨折の一分類手法であるSeinsheimer分類のType II A、II BおよびII Cに基づいた3種類の骨折モデルを対象とし、髄内釘が埋植された転子下骨折FEモデルをそれぞれ構築した。髄内釘インプラントには異なる長さをもつロング型、ミドル型、ショート型の3種類を使用した。解析の結果、仮骨部に生じる圧縮応力領域が広範囲であることによる骨髄合促進や、応力遮蔽の抑制への期待、さらに侵襲性の観点からミドル型の髄内釘インプラントの有効性が示唆された。(著者抄録)

Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2019&ichushi_jid=J05471&link_issn=&doc_id=20191009100008&doc_link_id=%2Fcx9biomc%2F2019%2F004000%2F009%2F0045-0052%26dl%3D0&url=https%3A%2F%2Fwww.medicalonline.jp%2Fjamas.php%3FGoodsID%3D%2Fcx9biomc%2F2019%2F004000%2F009%2F0045-0052%26dl%3D0&type=MedicalOnline&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00004_2.gif

Influence on blood flow improvement effect of lower limb using automatic CPM device of ankle joint

YOKOYAMA Shohei, SASAGAWA Keisuke, ODA Masafumi, HIRUKAWA Hiroshi

The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2019.32 2E33 2019

Strength evaluation for sledge frame shape of Para Ice Hockey Reviewed

ABE Yoshitaka, SASAGAWA Keisuke, ODA Masafumi, KAWAGOE Kenya

The Proceedings of Mechanical Engineering Congress, Japan 2019 ( 0 ) J02330P 2019

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

<p>Para Ice Hockey is an adaptive form of ice hockey used for athletes who have a disability which could be from limb loss, spinal cord injury, or a condition such as cerebral palsy. Athletes use a special sled called a 'sledge' to play Para Ice Hockey. Because Para Ice Hockey is a very physical sport, a sledge needs strength and stiffness. Foreign-made sledge is heavy and bad handling for Japanese athletes so there is a necessity of their weight saving. Therefore, Mg alloy sledge was manufactured because of weight saving. However, there were some problems about strength and stiffness for Mg alloy sledge. The purpose of this study is to evaluate strength of frame shape for Mg alloy sledge using finite element (FE) analysis. Based on the drawing, CAD models of Mg alloy prototype sledge were created, and their FE models were constructed. From FEA result on frontal impact, several high stress values were found in the sledge frame.</p>

DOI： 10.1299/jsmemecj.2019.J02330P

Influence of intramedullary nail diameter for fixation stability of subtrochanteric femoral fracture

SANO Takumi, SASAGAWA Keisuke, ODA Masafumi, SHIOTA Naofumi

The Proceedings of Conference of Hokuriku-Shinetsu Branch 2019 ( 0 ) D014 2019

Influence of intramedullary nail length for femoral subtrochanteric fracture model Reviewed

SANO Takumi, SASAGAWA Keisuke, ODA Masafumi, SHIOTA Naofumi

The Proceedings of Mechanical Engineering Congress, Japan 2019 ( 0 ) J02328P 2019

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

<p>Intramedullary nail fixation is one of the useful treatments for subtrochanteric fracture. In many cases, long type of intramedullary nail is applied to treatment of subtrochanteric fractures. A middle intramedullary nail, which has an intermediate length between long type and short type, was developed because of the viewpoint of minimally invasive. It is important to examine biomechanical influences on length and diameter of the intramedullary nail systems subjected to various loads. The aim of this study was to investigate the influence of length and diameter of intramedullary nail for subtrochanteric fracture models with Seinsheimer classification IIB using finite element analysis (FEA). Four types of intramedullary nail were considered: nail diameter 10mm and 12mm in long type, and nail diameter 10mm and 12mm in middle type. Subtrochanteric fracture finite element (FE) models with fracture type IIB that each nail was implanted were developed. A 1-mm-thick callus layer was set in the gap between bone fragments of the femur. As a result of FE analysis, the effectiveness of nail diameter increase was indicated from the viewpoint of bone union.</p>

DOI： 10.1299/jsmemecj.2019.J02328P

Prospects of Regional Revitalization Through Cooperative Education at Universities of Science and Technology Collaborating with SMEs in the Region

KOURAKATA Itaru, NONAKA Satoshi, ODA Masafumi, WAKABAYASHI Etsuko, NAGAO Masanobu, TOSE Akira

The Proceedings of the Tecnology and Society Conference 2019 G190416 2019

腸骨大体靱帯を考慮した大腿骨近位部の骨折リスク評価 Reviewed

櫻井航太, 笹川圭右, 尾田雅文, 佐藤朗, 寺島正二郎, 原利昭

39 175 - 180 2018

Influence of bone segments stability by intramedullary nail implants and small-diameter screw for femoral trochanter fracture Reviewed

TANAKA Keita, SASAGAWA Keisuke, ODA Masafumi, MAEHARA Takashi, HARA Toshiaki, SAKURAI Kota

The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2018 ( 0 ) 1B08 2018

Fracture evaluation for femoral finite element model using iliofemoral ligament Reviewed

SAKURAI Kota, SASAGAWA Keisuke, ODA Masafumi, SATOU Akira, TERASHIMA Shojiro, HARA Toshiaki

The Proceedings of Conference of Hokuriku-Shinetsu Branch 2018 ( 0 ) K023 2018

Influence of iliofemoral ligament for proximal femoral fractures Reviewed

SASAGAWA Keisuke, SAKURAI Kota, ODA Masafumi, SATO Akira, HARA Toshiaki

The Proceedings of Mechanical Engineering Congress, Japan 2018 ( 0 ) J0270202 2018

Development of deep vein thrombosis prevention device for improving QOL of patients with long-lived bedding Reviewed

YOKOYAMA Shohei, SASAGAWA Keisuke, ODA Masafumi, HIRUKAWA Hiroshi

The Proceedings of Mechanical Engineering Congress, Japan 2018 ( 0 ) J0270404 2018

Biomechanical study on intramedullary nail fixation using small-diameter screw Reviewed

SASAGAWA Keisuke, TANAKA Keita, ODA Masafumi, MAEHARA Takasi, SAKURAI Kota, HARA Toshiaki

The Proceedings of Conference of Hokuriku-Shinetsu Branch 2018 ( 0 ) K024 2018

Influence of intramedullary nail length for femoral subtrochanteric fracture model Reviewed

SANO Takumi, SAKURAI Kouta, SASAGAWA Keisuke, ODA Masafumi, SHIOTA Naohumi

The Proceedings of Mechanical Engineering Congress, Japan 2018 ( 0 ) J0270201 2018

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

<p>Intramedullary nail fixation is one of the useful treatments for subtrochanteric fracture. The intramedullary nail used is selected from two types, long type and short type. In many cases, long intramedullary nail is applied to treatment of subtrochanteric fractures. However, there is discussion on application of long intramedullary nail from the viewpoint of minimally invasive. A middle intramedullary nail, which has an intermediate length between long type and short type, was developed. It is essential to conduct biomechanical investigations of the intramedullary nail systems subjected to various loads. The aim of this study was to investigate the influence of length of intramedullary nail for subtrochanteric fracture models with Seinsheimer classification IIB. Three types of intramedullary nail were considered: long type, middle type, and short type. Subtrochanteric fracture finite element (FE) models, which included the femoral fracture of Seinsheimer classification IIB and the intramedullary nail system, were developed. A 1-mm-thick callus layer was set in the gap between bone fragments of the femur. As a result of FE analysis, the effectiveness of middle intramedullary nail was indicated from the viewpoint of bone union and invasiveness.</p>

DOI： 10.1299/jsmemecj.2018.J0270201

Influence of length of intramedullary nail implant on bone fragment fixation for femoral trochanteric fracture Reviewed

Keisuke SASAGAWA, Masafumi ODA, Naofumi SHIOTA

39 167 - 173 2018

Influence of torsional loading on intramedullary nail fixation for femoral subtrochanteric fracuture. Reviewed

38 47 - 54 2017.10

Consideration of shape design of artificial hip joint using numerical analysis method Reviewed

Japanese Journal of Clinical Biomechanics 38 259 - 265 2017.10

Biomechanical analysis using an elastioc modulus gradient model of an artificial hip stemp Reviewed

Japanese Journal of Clinical Biomechanics 38 267 - 274 2017.10

Biomechanical Effects of Stretching Exercise on Site of Femoral Subtrochanteric Fracture Reviewed

Aiko Noguchi, Keisuke Sasagawa, Masafumi Oda, Naofumi Shiota, Toru Sato, Toshiaki Hara

The Society of Life Support Engineering 29 ( 3 ) 100 - 105 2017.8

Selection of intramedullary nail system for femoral subtrochanteric fractures Reviewed

SASAGAWA Keisuke, ODA Masafumi, HARA Toshiaki, SHIOTA Naofumi

The Proceedings of Mechanical Engineering Congress, Japan 2017 ( 0 ) J0250102 2017

Numerical analysis investigation on optimal shape design for femoral stem Reviewed

SAKURAI Kota, SASAGAWA Keisuke, ODA Masafumi, HARA Toshiaki, NAKATA Katsuya, NOGUCHI Aiko

The Proceedings of Conference of Hokuriku-Shinetsu Branch 2017 ( 0 ) D031 2017

Biomechanical Investigation for Artificial hip stem with Gradient Function of Elastic Modulus Reviewed

Tanaka Keita, Sasagawa Keisuke, Hara Toshiaki, Oda Masafumi, Sakurai Kota, Noguchi Aiko

The Proceedings of Conference of Hokuriku-Shinetsu Branch 2017 ( 0 ) D032 2017

Liver-targeted hydrodynamic gene therapy: Recent advances in the technique Reviewed

Takeshi Yokoo, Kenya Kamimura, Hiroyuki Abe, Yuji Kobayashi, Tsutomu Kanefuji, Kohei Ogawa, Ryo Goto, Masafumi Oda, Takeshi Suda, Shuji Terai, Masafumi Oda

WORLD JOURNAL OF GASTROENTEROLOGY 22 ( 40 ) 8862 - 8868 2016.10

Language：English Publishing type：Research paper (scientific journal) Publisher：BAISHIDENG PUBLISHING GROUP INC

One of the major research focuses in the field of gene therapy is the development of clinically applicable, safe, and effective gene-delivery methods. Since the first case of human gene therapy was performed in 1990, a number of gene-delivery methods have been developed, evaluated for efficacy and safety, and modified for human application. To date, viral-vector-mediated deliveries have shown effective therapeutic results. However, the risk of lethal immune response and carcinogenesis have been reported, and it is still controversial to be applied as a standard therapeutic option. On the other hand, delivery methods for non-viral vector systems have been developed, extensively studied, and utilized in in vivo gene-transfer studies. Compared to viral-vector mediated gene transfer, nonviral systems have less risk of biological reactions. However, the lower gene-transfer efficiency was a critical hurdle for applying them to human gene therapy. Among a number of nonviral vector systems, our studies focus on hydrodynamic gene delivery to utilize physical force to deliver naked DNA into the cells in the living animals. This method achieves a high gene-transfer level by DNA solution injections into the tail vein of rodents, especially in the liver. With the development of genome editing methods, in vivo gene-transfer therapy using this method is currently the focus in this research field. This review explains the method principle, efficiency, safety, and procedural modifications to achieve a high level of reproducibility in large-animal models.

DOI： 10.3748/wjg.v22.i40.8862

大腿骨転子下骨折の髄内釘固定術モデルにおける力学的検討 Reviewed

野口愛子, 笹川圭右, 尾田雅文, 塩田直史, 佐藤徹, 原利昭

臨床バイオメカニクス 37 173 - 179 2016.9

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本臨床バイオメカニクス学会

大腿骨転子下骨折に対する髄内釘法の適用では骨癒合のための整復位を保持することが難しく、固定力を高める目的でプレートが併用される。再手術に至った臨床例に基づいて構築した解析モデルに有限要素法によるシミュレーション解析を適用した。解析対象は60歳男性で、左大腿骨転子下骨折に髄内釘固定法を適用したが、偽関節およびインプラント破損に至り、新たな髄内釘とプレート固定併用により骨癒合が得られた。再術後CT画像を基に表面形状モデルを作成した。さらに3DCADソフトウェアを用いて大腿骨、髄内釘、プレート、スクリューのCADモデルを作成した。大腿骨転子下骨折治療における髄内釘インプラントの力学的状態と、プレート併用の影響を生体力学的に評価したところ、髄内釘固定治療におけるプレート追加の有用性が示された。骨折治療期間における繰り返し歩行荷重により、髄内釘インプラントの疲労破壊が生じる危険性も示唆された。

高齢患者の多発骨盤骨折内固定における骨盤傾斜の影響 Reviewed

野口愛子, 勝山恵子, 笹川圭右, 尾田雅文, 塩田直史, 寺島正二郎, 原利昭

臨床バイオメカニクス 36 157 - 164 2015.10

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本臨床バイオメカニクス学会

高齢患者の多発骨盤骨折内固定における骨盤傾斜の影響について検討した。骨盤の両側骨折を受傷し、内固定術により骨折部をプレートとスクリューで固定した75歳女性の臨床データを解析対象とした。骨盤患部の術後X線CT画像を基に、骨盤、プレートおよびスクリューそれぞれの三次元形状モデルを作成した。その結果、骨盤姿勢の後傾により、骨盤への負荷は増加傾向を示した。骨盤後傾姿勢では、インプラントへの負荷は増加傾向にあり、破損の危険性が高まることが示唆された。

大腿骨ステム境界面におけるすべり量とステム長の関係 Reviewed

櫻井航太, 笹川圭右, 勝山恵子, 原利昭, 寺島正二郎, 尾田雅文, 中田活也

臨床バイオメカニクス 36 171 - 180 2015.10

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本臨床バイオメカニクス学会

大腿骨ステム境界面におけるすべり量とステム長の関係について検討した。標準型セメントレスステムの人工股関節置換術(THA)を施行した10例(全例女性、平均67.0±6.3歳)を解析対象とした。THAの術前および術後にCT撮影を行った。術前および術後のCTスライス画像から、三次元画像再構築ソフトを用いて、大腿骨およびステムそれぞれの表面形状モデルを構築した。大腿骨の有限要素(FE)モデルには、術前CT画像から構築した大腿骨モデルとステムCADモデルをFEモデル構築に使用した。ステム長が50〜100%までの短縮化ならば初期固定性への影響は少なかった。ステム長の短縮化が30〜40%にかけては初期固定性が著しく低下した。

Quantitative single-cell motility analysis of platelet-rich plasma-treated endothelial cells in vitro Reviewed

Tomoyuki Kawase, Takaaki Tanaka, Kazuhiro Okuda, Makoto Tsuchimochi, Masafumi Oda, Toshiaki Hara

CYTOSKELETON 72 ( 5 ) 246 - 255 2015.5

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-BLACKWELL

Platelet-rich plasma (PRP) has been widely applied in regenerative therapy due to its high concentration of growth factors. Previous in vitro and in vivo studies have provided evidence supporting the angiogenic activity of PRP. To more directly demonstrate how PRP acts on endothelial cells, we examined the PRP-induced changes in the motility of human umbilical vein endothelial cells by examining the involvement of VEGF. Time-lapse quantitative imaging demonstrated that in the initial phase (approximate to 2 h) of treatment, PRP substantially stimulated cell migration in a wound-healing assay. However, this effect of PRP was not sustained at significant levels beyond the initial phase. The average net distance of cell migration at 10 h was 0.45 +/- 0.16 mm and 0.82 +/- 0.23 mm in control and PRP-stimulated cells, respectively. This effect was also demonstrated with recombinant human VEGF and was significantly attenuated by a neutralizing anti-VEGF antibody. Immunofluorescent examination of paxillin and actin fibers demonstrated that PRP concomitantly up-regulated focal adhesion and cytoskeletal formation. Western blotting analysis of phosphorylated VEGFR2 demonstrated that PRP mainly stimulated the phosphorylation of immature VEGFR2 in a dose- and time-dependent manner, an action that was completely blocked by the neutralizing antibody. Taken together, these data suggest that PRP acts directly on endothelial cells via the activation of VEGFR2 to transiently up-regulate their motility. Thus, the possibility that PRP desensitizes target endothelial cells for a relatively long period of time after short-term activation should be considered when the controlled release system of PRP components is designed. (c) 2015 Wiley Periodicals, Inc.

DOI： 10.1002/cm.21221

An atmospheric-pressure plasma-treated titanium surface potentially supports initial cell adhesion, growth, and differentiation of cultured human prenatal-derived osteoblastic cells Reviewed

Tomoyuki Kawase, Takaaki Tanaka, Hiromi Minbu, Mana Kamiya, Masafumi Oda, Toshiaki Hara

JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS 102 ( 6 ) 1289 - 1296 2014.8

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-BLACKWELL

An atmospheric-pressure plasma (APP) treatment was recently reported to render titanium (Ti) surfaces more suitable for osteoblastic cell proliferation and osteogenesis. However, the mechanism of action remains to be clearly demonstrated. In this study, we focused on cell adhesion and examined the effects of the APP treatment on the initial responses of human prenatal-derived osteoblastic cells incubated on chemically polished commercially pure Ti (CP-cpTi) plates. In the medium containing 1% fetal bovine serum, the initial cell adhesion and the actin polymerization were evaluated by scanning electron microscopy and fluorescence microscopy. The expression of cell adhesion-related molecules and osteoblast markers at the messenger RNA level was assessed by real-time quantitative polymerase chain reaction. Although the cells on the APP-treated CP-cpTi surface developed fewer cytoskeletal actin fibers, they attached with higher affinity and consequently proliferated more actively (1.46-fold over control at 72 h). However, most of the cell adhesion molecule genes were significantly downregulated (from 40 to 85% of control) in the cells incubated on the APP-treated CP-cpTi surface at 24 h. Similarly, the osteoblast marker genes were significantly downregulated (from 49 to 63% of control) at 72 h. However, the osteoblast marker genes were drastically upregulated (from 197 to 296% of control) in these cells by dexamethasone and beta-glycerophosphate treatment. These findings suggest that the APP treatment improves the ability of the CP-cpTi surface to support osteoblastic proliferation by enhancing the initial cell adhesion and supports osteoblastic differentiation when immature osteoblasts begin the differentiation process. (C) 2014 Wiley Periodicals, Inc.

DOI： 10.1002/jbm.b.33114

Novel electric power-driven hydrodynamic injection system for gene delivery: Safety and efficacy of human factor IX delivery in rats Reviewed

T. Yokoo, K. Kamimura, T. Suda, T. Kanefuji, M. Oda, G. Zhang, D. Liu, Y. Aoyagi

Gene Therapy 20 ( 8 ) 816 - 823 2013.8

Language：English Publishing type：Research paper (scientific journal)

The development of a safe and reproducible gene delivery system is an essential step toward the clinical application of the hydrodynamic gene delivery (HGD) method. For this purpose, we have developed a novel electric power-driven injection system called the HydroJector-EM, which can replicate various time-pressure curves preloaded into the computer program before injection. The assessment of the reproducibility and safety of gene delivery system in vitro and in vivo demonstrated the precise replication of intravascular time-pressure curves and the reproducibility of gene delivery efficiency. The highest level of luciferase expression (272 pg luciferase per mg of proteins) was achieved safely using the time-pressure curve, which reaches 30 mm Hg in 10 s among various curves tested. Using this curve, the sustained expression of a therapeutic level of human factor IX protein (&gt
500 ng ml-1) was maintained for 2 months after the HGD of the pBS-HCRHP-FIXIA plasmid. Other than a transient increase in liver enzymes that recovered in a few days, no adverse events were seen in rats. These results confirm the effectiveness of the HydroJector-EM for reproducible gene delivery and demonstrate that long-term therapeutic gene expression can be achieved by automatic computer-controlled hydrodynamic injection that can be performed by anyone. © 2013 Macmillan Publishers Limited.

DOI： 10.1038/gt.2013.2

Mechanical Evaluation for Fitting of NPPV Nasal Mask Reviewed

Masafumi Oda, Keiichi Ninomiya, Toshiaki Hara

Journal of Life Support Engineering 25 ( 4 ) 124 - 129 2013

Development of a capacitance type 6 axis force sensor Reviewed

Masafumi ODA, Toshiaki HARA

Life Support 23 ( 3 ) 116 - 123 2011.10

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Life Support Engineering

We have been developing a novel capacitance type force sensor that enables simultaneous measurement of a torque around the vertical axis as well as normal and two orthogonal shear forces on the skin surface. In our previous research, the prototype sensors were made and authenticated the potency. Prototype sensors are parallel plate type collocated a dielectric between two circuits. We have planned to use an approximated displacement-capacitance characteristic curve when we estimate an output force. Therefore, this paper reports about an ideal approximation of the curve and several applications, such as surgical robot and nursing-care system.

DOI： 10.5136/lifesupport.23.116

Other Link： http://search.jamas.or.jp/link/ui/2012056612

Primary stability of tapered wedge-shaped cementless stems in patients with stvepipe canal and type c bone: Biomechanical estimation of primary micromotion Reviewed

Katsuya NAKATA

Journal of Japanese Society for Joint Diseases 29 ( 4 ) 485 - 494 2010.12

FE model construction for stress analysis on NPPV nasal mask Reviewed

Keiichi NINOMIYA, Yuusuke YOSHIDA, Masafumi ODA

24 ( 4 ) 23 - 26 2009.12

Computational dynamics of stress to act on at the time for NPPV Nasal Mask Reviewed

Keiichi Ninomiya, Yuusuke Yoshida, Toshihiro Handa, Masafumi Oda, Toshiaki Hara

The Society of Life Support Technology 21 ( 2 ) 70 - 75 2009.6

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Life Support Engineering

In late years, the patient load of chronic respiratory failure disease, such as a Obstructive Pulmonary Disease (COPD) or Sleep Apnea Syndrome (SAS) increaseschronic obstructive pulmonary disease (COPD) and sleep apnea syndrome (SAS), is increasing. For the patient, in whom such condition is comparatively serious, non-invasive positive pressure ventilation (NPPV) may be prescribed. Since this disposal method uses a nasal mask, a patient is treated non-invasively. Although, It is reported that skin obstacles arise, such as a pressure necrosis and compression gangrene, by the reason the mask pressed the face.<BR>Consequentially, it was created that the finite element model of the face portion based on a human body slice picture, and the stress which acts on the contact area of a nasal mask was calculated. And, It turned out that a nasal mask suitable for the form of an individual face is required, in order to reduce a skin obstacle.

DOI： 10.5136/lifesupport.21.70

Other Link： http://search.jamas.or.jp/link/ui/2009283320

セメントレスステムの初期固定性に関する生体力学的定量評価 Reviewed

中田活也, 山村在慶, 富士武史, 尾田雅文

日本整形外科学会雑誌 83 ( 83 ) 2 2009.2

Stress analysis of accessories for NPPV nasal masks for FE personal model construction Reviewed

Keiichi Ninomiya, Yusuke Yoshida, Masafumi Oda, Toshiaki Hara

Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C 75 ( 752 ) 1026 - 1032 2009

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Mechanical Engineers

The number of patients with chronic respiratory deficiency, such as Chronic Obstructive Pulmonary Disease (COPD) or Sleep Apnea Syndrome (SAS), is increasing. For patients with comparatively serious symptoms, the Non-invasive Positive Pressure Ventilation (NPPV) may be prescribed. However, pressure necrosis or anaclisis could affect treatment by occurring at the contact area of nasal mask. In response to this problem, the construction of a simulation environment can be applied. The system consists of leaser measurement technology and ultrasonic and the Free Form Deformation (FFD) technique. The shape of the face is measured by laser technology, while ultrasonic technology is used to measure he shape of soft tissue and bone. This personal simulation model was created based on these measurement results and the interpolation results using the FFD. A fundamental numerical analysis was performed, and Von Mises stress distribution was shown when the NPPV nasal mask made contact with the face. This also compared with the actually measured results. In conclusion, the finite element model made by the proposed system can reproduce the actual stress state. By using this system, the shape of a nasal mask suitable for each patient can be determined.

DOI： 10.1299/kikaic.75.1026

A leg modeling system for designing artificial leg sockets Reviewed

Masafumi Oda, Toshiaki Hara

Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C 75 ( 754 ) 1725 - 1732 2009

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Mechanical Engineers

When the relationship between the dimensions of the crural area and those of the artificial leg socket is poor, it may cause problems, such as pressure sores in the crural area. This study discusses the mechanical characteristics at artificial leg socket interfaces. A computer-aided design (CAD) model of the crural area was constructed from ultrasonic three-dimensional measurements of a crural model, and a personalized CAD model of the crural area was constructed using a free-form deformation technique. Next, a finite element (FE) model of an artificial leg socket constructed using a preliminary design was synthesized as the leg model. Then, the mechanical behavior at the interface between the crural model and artificial leg socket was investigated using finite element method (FEM) analysis. When the socket was adjusted to the leg, the Von Mises stress at the bottom of the socket decreased. This also had the effect of holding the socket stably.

DOI： 10.1299/kikaic.75.1725

中越沖地震における地場産業の被害と復興状況（共著）

尾田雅文, 小浦方格, 原利昭

日本機械学会２００８年度年次大会講演資料集（９） 2008.8

Dynamic Mechanical Characteristics of Thorax Structure Reviewed

Hisashi Ohkawa, Yushi Suzuki, Yutaka Kaneta, Masafumi Oda, Toshiaki Hara

Journal of Biomechanical Science and Engineering 3 ( 4 ) 468 - 477 2008

Language：English Publishing type：Research paper (scientific journal)

Thorax plays a crucial role in shielding internal organs from external loads. To establish a rational safety criterion for traffic accidents, it is important that we understand the mechanical behaviors of the thorax. We studied the response of thorax to impact experimentally. The purpose of this study is to understand the characterization of thoracic structure from measurement parameters by impact test. The specimen used was porcine thorax, the size of which was approximately equal to human thorax, after removing the internal organs. Using original test apparatus, the specimen was subjected to low energy impact and a sensitivity study was conducted to explore various parameters, including the response to the impact load, strain on each rib, and the acceleration and displacement in the thorax. Comparison of impact locations (front, back, and lateral) showed characteristic variations among the results. A frontal impact produced large acceleration and displacement. Therefore, it could be expected to stress the internal organs directly. In the case of an impact from behind, the impact response load was higher and the deformation of thorax was remarkably small. It appeared that the thoracic resists backward impact, and provides protection of internal organs. In lateral impact, the concentrated load tends to occur in the ribs, and the rib strain was high. Hence, the rib parts were prone to fracture, and the internal organs were subject to increased risk of secondary damages of the bone fracture due to bone sticking organs. In conjunction with the impact tests, static compressive tests were conducted. The deformation behavior of the thorax is grossly affected by the constraints of the binding of ligaments connecting bones. Therefore, this structure provides smooth elasticity by transforming the whole structure when a load is applied to the thoracic parts. This provided confirmation of the structural characteristics that were obvious in impact testing. This is the first time that attention has been paid to the thoracic structure and its deformation behavior has been investigated. The response of thoracic structures to external loads requires further research. © 2008, The Japan Society of Mechanical Engineers. All rights reserved.

DOI： 10.1299/jbse.3.468

C06(4) 中越沖地震における地場産業の被害と復興状況(C06 能登半島および中越沖地震の被害調査報告,一般開放行事,市民フォーラム,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

尾田雅文, 小浦方格, 原利昭

年次大会講演資料集 2008 23 - 24 2008

0921 Wavelet Transform for Evaluation of An Arthrodial Cartilage

KOGURE Hidetomo, ODA Masafumi, HARA Toshiaki

The proceedings of the JSME annual meeting 2007 143 - 144 2007

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

In this study, we developed the ultrasonic arthroscope, which can measure 3-dimesional position of the site of the disease, by using the 3-dimensional magnetic sensor. We measured the ultrasonic echo from articular cartilage upon which the enzyme acts. Then, wavelet transform was used to evaluate the articular cartilage. The result of this study showed that the echo amplitude is affected by enzyme processing time. And, the frequency domain from 12 to 17MHz disappeared.

DOI： 10.1299/jsmemecjo.2007.5.0_143

1051 Development of Surgical Sensor

MORIJIRI Takeshi, ODA Masafumi, HARA Toshiaki, KOZAKAI Akifumi

The proceedings of the JSME annual meeting 2007 63 - 64 2007

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

This paper is a study on the development of a haptic sensor system for robot surgery. The haptic sensor was manufactured by way of trial, which was consisted of rubber sensor and terete device. The terete device was allocated as hound's tooth check, for the purpose of estimation of normal load and traction load. Integral part of the tactile sensor system is the sensor itself i.e. the part of the system that transform the applied pressure/force in a change of resistance. The sensor output well describes the 3-dimensional distribution of force and will represent the subjective evaluations of surgeon.

DOI： 10.1299/jsmemecjo.2007.6.0_63

The Fundamental Research on Optimum Design for NIPPV Nasal Mask

NINOMIYA Keiichi, HANDA Toshihiro, ODA Masafumi, HARA Toshiaki

Journal of Life Support Technology 18 109 - 109 2006

531 Functional and Appropriate Design of the Prosthetic Socket Based on the Interfacial Pressure between Socket and Amputation Stump

ONO Souhei, ODA Masafumi, TERASIMA Kazuhiro, HARA Toshiaki

The proceedings of the JSME annual meeting 2006 117 - 118 2006

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

It is well known that there is a qualitative relationship between the loads exerted on a below-knee prosthesis and the stresses exerted on the amputee's stump. In this paper, the appropriate design system is developed to determine the highly favorable socket interface. This system demonstrated that, in the future studies, the use of CAD/CAM, ultrasound measurement technique and Free Form Deformation method with Visible Human Model for FEM analysis holds promise for highly endurability of below-knee prosthesis.

DOI： 10.1299/jsmemecjo.2006.5.0_117

The Industry-University Cooperation and the Intellectual Property Enterprise at Post-institutionalization Invited

ODA Masafumi

Niigata medical journal 119 ( 8 ) 450 - 453 2005.12

Ultrasonic Measurement System using Wavelet Analysis for the Lower Leg Reviewed

ASAI Kanako, HANAFUSA Akihiko, FUWA Teruhiko, ODA Masafumi, NAKAYAMA Tsuyoshi

The Life Support Technorogy 17 ( 3 ) 100 - 108 2005.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Life Support Engineering

Checking the fit between a prosthetic socket and a residual limb is important for functional prostheses. Designing a prosthetic socket using a CAD system and checking the above mentioned fit by analyzing the deformation and stress under the weight of an amputee requires a three-dimensional model of the residual limb that includes not only the surface, but also the fat, muscle and bone. An ultrasonic measurement system, including a probe that three-dimensionally measures the external surface shape and the shapes of internal tissues simultaneously was developed. The system uses wavelet analysis to define the positions of the boundaries between each tissue. A cone-shaped aluminum test object was measured using the system, which was shown to be capable of measuring radius with an error of 0.6mm and slope with an error of 6%. In addition, the lower legs were measured, and the surface, muscles and bone boundaries were defined by wavelet analysis. The results of these measurements were compared to MRI cross sectional data, and the average error for the leg surface, muscles and tibia were 1.7mm, 2.4mm and 1.9mm, respectively, for boundaries that were determined correctly.

DOI： 10.5136/lifesupport.17.100

Other Link： http://search.jamas.or.jp/link/ui/2006091552

1143 Ultrasonic screw hole detection of the intramedullary nail

YAGI Takeo, KAWANA Takumi, UMENO Takatoshi, ODA Masafumi, HARA Toshiaki

The proceedings of the JSME annual meeting 2005 127 - 128 2005

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The clinical results for osteosynthesis using interlocking nailing generally have been good. However, the rate of radiation injury during the detection of nail hole has been noted to be seriously high, particularly in both of orthopedists and patients. We developed the ultrasonic technique to detect the distal nail hole and to relieve the radiation injury. The qualitative results were that technical experience and careful manipulation of probe are important factors in achieving a successful result.

DOI： 10.1299/jsmemecjo.2005.5.0_127

Non-Contact Eye-Gazing Point Detection during Driving a Wheelchair Simulator Reviewed

ODA Masafumi, ISOMURA Tsuneshi

Transactions of the Japan Society of Mechanical Engineers. C 69 ( 685 ) 2437 - 2444 2003.12

逐次撃墜法を利用した車椅子操作時の非接触視点位置検出 Reviewed

鉄谷聖和, 尾田雅文, 首藤由里子

職業能力開発報文誌 15 ( 1 ) 1 - 8 2003.4

Direct Linear Transformation Technique for Non-Contact Eye-Gazing Point Detection : 2nd Report, Improving the Detecting Technique via Two Dimensional Multi Resolution Analysis Reviewed

ODA Masafumi, ISOMURA Tsuneshi

The Life Support Technorogy 14 ( 1 ) 2 - 7 2002.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Life Support Engineering

The Purpose of this study is to detect eye-gazing points during driving a wheelchair through the image sequence analysis of video frames. The performlances can be measured without restrictions of specific devices such as any accessories and sensors, which were put on a body. Images obtained with two video cameras allow the algorithm with two-dimensional multi resolution analysis through wavelet analysis to extract boundaries of right and left irises. Their three-dimensional positions and directions were estimated through direct linear transformation(DLT)technique. The eye-gazing point was evaluated through the relationship between the vertical vector of iris and line-of-sight. Consequently, Some preliminary results were presented to illustrate the detecting error of eye-gazing point.

DOI： 10.5136/lifesupport.14.2

2次元多重解像度解析を利用した非接触点位置検出法の検討 Reviewed

尾田雅文, 鉄谷聖和, 首藤由里子

職業能力開発報文誌 13 ( 2 ) 17 - 24 2001.12

動的荷重条件下における人工股関節コンポーネントの歪み量評価 Reviewed

帆足雅晃, 尾田雅文

職業能力開発報文誌 13 ( 1 ) 43 - 50 2001.12

2B22 Matching Pursuit Technique Estimation for Non-Contact Eye-Gazing Point Detection

ODA Masafumi, ISOMURA Tsuneshi, SEKIGUCHI Yukio, HARA Toshiaki

Proceedings of the JSME Bioengineering Conference and Seminar 2001 165 - 166 2001

Non-Contact Eye-Gazing Point Detection Technique via Two Dimensional Multi Resolution Analysis Reviewed

Masafumi Oda, Nozomi Sanada, Yukio Sekiguchi, Tsuneshi Isomura, Toshiaki Hara

Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C 66 ( 650 ) 3406 - 3412 2000

Language：English Publishing type：Research paper (scientific journal)

The purpose of this study is to detect eye-gazing points during driving a wheelchair through the image sequence analysis of video frames. The performances can be measured without restrictions of specific devices such as any accesories and sensors, which were put on a body. Images obtained with three video cameras allow the algorithm to extract four feature points on a face and irises. Their three-dimensional positions were estimated through direct linear transformation (DLT) technique with magnification of a facial image through multi resolution analysis. The direction of a face was estimated via three-dimensional positions of the former, and it defined the facial coordinate. On the other hand, the eye-gazing point was evaluated through three-dimensional positions of the latter. Consequently, Some preliminary results were presented to illustrate the difference in variations with the eye-gazing point between driving a wheelchair and walking. © 2000, The Japan Society of Mechanical Engineers. All rights reserved.

DOI： 10.1299/kikaic.66.3406

Non-Contact Eye-Gazing Point Detection Technique via Two Dimensional Multi Resolution Analysis

TETSUTANI Kiyokazu, SHUTO Yuriko, ODA Masafumi, ISOMURA Tsuneshi, SEKIGUCHI Yukio, HARA Toshiaki

Proceedings of the JSME Bioengineering Conference and Seminar 2000 31 - 32 2000

Direct Linear Transformation Technique for Non-Contact Eye-Gazing Point Detection : 2nd Report, Improving the Detecting Technique via Two Dimensional Multi Resolution Analysis Reviewed

ODA Masafumi, SANADA Nozomi

The Life Support Technorogy 11 ( 3 ) 80 - 85 1999.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Life Support Engineering

The purpose of this study is to detect eye-gazing points during driving a wheelchair through the image sequence analysis of video frames.The performances can be measured without restrictions of specific devices such as any accessories and sensors,which were put on a body.Images obtained with three video cameras allow the algorithm to extract four feature points on a face and irises.Their three-dimensional positions were estimated through direct linear transformation(DLT)technique with magnification of a facial image through wavelet analysis.The direction of a face was estimated via three-dimensional positions the former,and it defined the facial coordinate.On the other hand,the eye-gazing point was evaluated through three-dimensional positions of the latter.Consequently,Some preliminary results were presented to illustrate the difference in variations with the eye-gazing point between driving a wheelchair and walking .

DOI： 10.5136/lifesupport.11.80

Ultrasonic technique for contact mechanism estimation of an artificial hip joint Reviewed

Masafumi Oda, Tasuku Kanomata, Toshiaki Hara

JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing 42 ( 3 ) 560 - 567 1999

Language：English Publishing type：Research paper (scientific journal) Publisher：Japan Society of Mechanical Engineers

Ultrasonic techniques were developed to study the characteristics for contact mechanics of an artificial hip joint. Total Hip Replacement model was used to determine contact pressure distribution on an artificial aceptabular cup subjected to compressive load ranged from 196 N to 588 N in four femur positions. The contact pressure was found to be non-uniform and reaches more than 6 MPa. It was shown that the tendency of the pressure distribution is in agreement with that obtained by the computer simulation. Some preliminary results were also presented to illustrate the effect of the direction and the magnitude of the load applied to a femoral head on the contact pressure distribution on the aceptabular cup and to evaluate the contact mechanism of the artificial hip joint.

DOI： 10.1299/jsmec.42.560

Ultrasonic Technique for Contact Mechanism Estimation of an Artificial Hip Joint Reviewed

ODA Masafumi, HARA Toshiaki

Transactions of the Japan Society of Mechanical Engineers. A 64 ( 624 ) 2093 - 2099 1998.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

An ultrasonic techniques was developed to study the characteristics for contact mechanics of an artificial hip joint. Total Hip Replacement model was used to determine contact pressure distribution on an artificial aceptabular cup subjected to compressive load ranged from 196 N to 588 N in four femur positions. The contact pressure was found to be nonuniform and less than 6 MPa. It was shown that the tendency of the pressure distribution is in agreement with that obtained by the computer simulation. Some preliminary results were also presented to illustrate the effect of the direction and the magnitude of the load applied to a stem on the contact pressure distribution on the aceptabular cup and to evaluate the contact mechanism of the artificial hip joint.

DOI： 10.1299/kikaia.64.2093

Other Link： https://jlc.jst.go.jp/DN/JALC/00085215993?from=CiNii

Ultrasonic Technique for Contact Mechanism Estimation of an Artifical Hip Joint Reviewed

ODA Masafumi

The Life Support Technorogy 10 ( 3 ) 111 - 118 1998.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Life Support Engineering

An ultrasonic technique was developed to study the characteristics for contact mechanics of an artificial hip joint. Total Hip Replacement model was used to determine contact pressure distribution on an artificial aceptabular cup subjected to compressive load ranged from196N to 588N in four femur positions. The contact pressure was found to be nonuniform and less than 6MPa. It was shown that the tendency of the pressure distribution is in agreement with that obtained by the computer simulation.Some preliminary results were also presented to illustrate the effect of the direction and the magnitude of the load applied to a stem on the contact pressure distribution on the aceptabular cup and to evaluate the contact mechanism of the artificial hip joint.

DOI： 10.5136/lifesupport.10.111

超音波法による摺動時の摩擦力評価 Reviewed

尾田雅文

職業能力開発報文誌 9 ( 2 ) 17 - 24 1997.10

鋼－セラミクス摺動時の摺動初期における摩擦応力解析

尾田雅文

新潟職業能力開発短期大学校紀要 3 8 - 13 1997.3

Adhesion Evaluation of TiN Film by Acoustic Emission Technique Reviewed

ODA Masafumi, HARA Toshiaki

Transactions of the Japan Society of Mechanical Engineers. A 62 ( 595 ) 865 - 871 1996.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

An acoustic emission (AE) technique was developed to study the adhesional characteristics of TiN thin film deposited on SKD and SKH steel using plasma CVD technique. Pin-on-disk type wear testing machine with acoustic emission sensor was used to measure the relationship between the AE count rates monitored through the pin and the wear rate of the steel materials deposited by the thin film and to investigate the adhesional strength of the film. In addition, the applicability of the Root Mean Square (RMS) value derived from the AE signal to the evaluation of the wear and frictional properties of the steel was discussed, The experimental results showed that the relationship between the wear rate and the RMS value was significantly dependent upon the mechanical properties of the pin with a deposition of the film. The frictional coefficient derived from the interface between the pin and the disk increased slightly with an increase in the amount of indentational load applied to the pin. It may also mentioned that the present results demonstrate sufficient promise of the ability of the AE technique to be applied to the evaluation of the thin film deposited on metallic materials.

DOI： 10.1299/kikaia.62.865

Other Link： https://jlc.jst.go.jp/DN/JALC/00038913440?from=CiNii

Contact Pressure Measurement utilizing Time-Frequency Analysis of Ultrasonic Reflected Wave at the Rubber Surface in Sliding Contact Reviewed

ODA Masafumi, HARA Toshiaki

Transactions of the Japan Society of Mechanical Engineers. A 62 ( 598 ) 1425 - 1431 1996.12

A Characteristic on Abrasion Pattern on a Sliding Surface of Rubber under Stick-Slip Motion Reviewed

ODA Masafumi, HARA Toshiaki

Transactions of the Japan Society of Mechanical Engineers. A 61 ( 587 ) 1663 - 1668 1995.12

Tribological Evaluation of Boriding Metal by Acoustic Emission Technique Reviewed

ODA Masafumi, HARA Toshiaki

Transactions of the Japan Society of Mechanical Engineers. C 61 ( 591 ) 4450 - 4456 1995.12

ゴム摺動時の接触圧力挙動

尾田雅文

新潟職業能力開発短期大学校紀要 1 1 - 7 1995.3

新素材等の耐摩耗特性に関する研究(硼化処理鋼の耐摩耗特性及びAE信号測定による危険予知)

尾田雅文, 高野格, 田中亙, 桂沢豊

新潟県工業技術研究報告書 20 29 - 34 1991.3

新素材等の耐摩耗特性に関する研究(セラミクス及び各種表面処理材の耐摩耗特性)

尾田雅文, 高野格, 田中亙, 三村和弘

新潟県工業技術研究報告書 19 27 - 32 1990.3

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