2002 Fiscal Year Final Research Report Summary
Development of the functional bad bearing device for hip joint
| Project/Area Number |
12794021
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| Research Category |
Grant-in-Aid for University and Society Collaboration
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| Allocation Type | Single-year Grants |
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| Research Field |
Biomedical engineering/Biological material science
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| Research Institution | NIIGATA UNIVERSITY |
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Principal Investigator |
HARA Toshiaki Faculty of Engineering Professor, 工学部, 教授 (50134953)
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| Co-Investigator(Kenkyū-buntansha) |
NITTA Isami Faculty of Engineering Associate Professor, 工学部, 助教授 (30159082)
OOMORI Go Graduate School of Medical and Dental Sciences Associate Professor, 大学院・医歯学総合研究科, 助教授 (70283009)
ENDOU Naoto Graduate School of Medical and Dental Sciences Professor, 大学院・医歯学総合研究科, 教授 (10251810)
SATOU Kazuo Central Niigata Prefecture Industrial Promotion Center Development Section Chief, 技術開発課, 技術開発課長(研究職)
HOSHI Teruo Mizuho Medical Engineering Co. Development Section Director, 開発部長(研究職)
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| Project Period (FY) |
2000 – 2002
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| Keywords | device / Perthes disease / load bearing function / Orthopaedics / hip joint / biomechanics / stress analysis / optimum design |
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| Research Abstract |
In tins research project, new developments in orthopaedic implants and new manufacturing technologies have been closely tied for the past three years Manufacturability has been required to transform successful biomechanical and collaborated research into a successful medical product especially for Perthes disease. The device obtained its strength from Ti-6A1-4V metal alloy, its load bearing function with flexibility through special designed linkage, and its fixation through a pelvic surface though this collaboration has experienced difficulties in achieving functional effectiveness and fulfilling product design and anatomic requirements. As a results, some devices for clinical trial are currently made by the applications of redesign to earlier developed devices for this project.
Experimental analysis was carried out on 7 hip models with the special designed devive, including normal joints and joints affected with Perthes diseases. Three-dimensional hip motion data on the ability of dail
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y life including evacuation and sedentary occupation for female and male was analyzed by standard gait analysis techniques, using video analysis and electrogoniometers. The results from the motion data proved the efficacy of the device and the ability of evacuation and sedentary occupation although there is the motion containment of the hip.
In addition, three-dimensional femoral head contact with the acetabulum was studied to investigate the load bearing function of the device using electric conductive rubber pressure sensor systems. It was found that there was significant difference in the contact stress between joint models with/without the device.
Finally we studied the theoretical stress distribution in the pelvis-device-proximal femur united model by means of a three-dimensional finite element method to determine the qualitative parameters on stress distribution in the model during gait and daily life, the deformability, and the fixational rigidity.
We conclude that the university and society collaboration has been successfully carried out to develop the new orthopaedic device which has the endurability and clinical applicability and that some new technologies have demonstrated functionality, cost effectiveness, and regulatory approvability. Less
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