Faculty Profiles - ODA Masafumi

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

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

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

Scopus

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

Scopus

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

Scopus

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

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

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

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