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  • 1
    Digitale Medien
    Digitale Medien
    Stress Analysis and Optimizing of Osteoinductive Ca-P Ceramics and Net-Cage-Structured Titanium Alloy in Dog Segmental Femoral Defect Reparation (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 309-311 (May 2006), p. 231-234 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The purpose of this study was to develop a feasible technique for bone reparation and further explore the possible applications of Ca-P ceramics in segmental load-bearing bone reparation. HA/TCP ceramics sintered at 1250oC were fabricated into tube-like columns of Φ15mm×30mm with a central canal of Φ4mm. Bone-like apatite was precipitated on the ceramics before implantation. 12 male dogs were used in this study, and a 30mm long segmental bone defect was made in the middle of one femur of each dog. Supported by the fixation of net-cage-structured TC4, the osteoinductive Ca-P ceramic cylinder was used to repair the segmental defect in dogfemur. Stress was analyzed by ANSYS. The morphology recovery, function restoration, gait analyses and bone regeneration were evaluated. After implantation at 2, 4 and 8 months, the specimens were harvested respectively. The specimens were evaluated with morphological observation and mechanical testing. Stress analysis showed that the thickness of TC4 net cage was 0.3mm. The morphology recovery of the experimental animal was good and function was restoredafter 2 months gradually. Aided by stress analysis and by optimizing the design and fixation of implants, Ca-P materials with excellent osteoinductivity could be applied in repairing segmental bone defects
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.309-311.231.pdf
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  • 2
    Digitale Medien
    Digitale Medien
    Improvement and FEA of New Type of Osteointegrated Implant for Higher Amputated Leg Attachment (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 829-832 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Stress concentration is one of the main mechanical problems leading to the failure ofclinical application for osteointegrated implant of percutaneous osteointegrated prosthesis, which isespecially marked for higher amputated leg prosthesis. Traditionally design was composed of onlythe distal part. To improve the biomechanical safety, a new design with the lag part similar to thelag screw was introduced. Based on CT scan data, relatively accurate model of femur for finiteelement analysis (FEA) were obtained. The FEA results with the new implant demonstrated thatcompared to traditional design, the declination of bone stress peak ranged from 15.68% to 28.67%,perpendicular deformation from 34.73% to 72.16%, and maximal stress of implant from 14.51% to23.36% with the increasing of loads from 3750N to 2000N. So the new design of osteointegratedimplant would be more secure mechanically, in the case of higher amputated leg attachment
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.829.pdf
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  • 3
    Digitale Medien
    Digitale Medien
    Preliminary Evaluation of a New Dental Implant Design with Finite Element Analysis (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 288-289 (June 2005), p. 657-660 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: It is important to obtain mechanical coupling between dental implants and bone, because the lack of mechanical coupling may cause bone loss around implants. In this research, a new cylindrical dental implant composed of three parts was designed to offer favored mechanical environment for the bone. A special gap structure changed the means of the stress transmission and decreased the stress inthe cortical bone around the neck of the implant. Through finite element analysis (FEA) of stress distribution in bone around implant-bone interface, the advantages of this new implant (reducing stress concentration in cervical cortex and satisfying varieties of clinical needs) were verified. The peak stress for the new design was about 30 percent less than that of the traditional implant and the flexibility of the design was also confirmed by changing the gap depth and the wall thickness
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.288-289.657.pdf
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  • 4
    Digitale Medien
    Digitale Medien
    Histological Evaluation of Percutaneous Device with Different Materials (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 309-311 (May 2006), p. 423-426 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Biological sealing is a key factor for successful development of percutaneous device(PD). A new device with arc-perforated flange as subcutaneous part and groove-shaped percutaneous part, was intended to improve integration of soft tissue and implant. Material and surface properties are known to have great impact on tissue-implant integration. To understand how a material and its surface property can influence tissue reaction, and to find the appropriate material for PD fabrication, five different kinds of materials were prepared for in vivo animal tests with corresponding histological evaluation. Results revealed that a more stable junction was formedbetween the soft tissue and HA coated titanium implant than other combinations
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.309-311.423.pdf
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  • 5
    Digitale Medien
    Digitale Medien
    Investigation of Biomechanics Behavior in Unstable Pertrochanteric Fracture Treated with Three Typical Nails by FEA (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 833-836 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Fixation nail systems , such as DHS, DCS and the standard Gamma-nail, are widelyapplied for the 31-A2 intertrochanteric unstable fractures treatment, but which one would be ofmore curative effect is still remained as a disputed problem. In this work, precise femur model with31-A2 fracture was rebuilt based on the CT data, and fixation nail models were built by CAD. Bythe means of finite element analysis (FEA), the biomechanical data of femur and nail systems wereachieved under typical loading. The results show that under the same load, the maximal stresses onthe fracture sections for DCS, DHS and Gamma nail systems are 48MPa, 24MPa and 19MPa,separately; and the directional deformation is the highest with DCS fixation systems, while lowestwith Gamma nail fixation system. Considering the mechanical safety, Gamma nail is more suitablefor 31-A2 intertrochanteric unstable fractures treatment
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.833.pdf
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  • 6
    Digitale Medien
    Digitale Medien
    3D Finite Element Analysis of Bone Stress around Distally Osteointegrated Implant for Artificial Limb Attachment (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 288-289 (June 2005), p. 653-656 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Stress shielding, which occurred always around traditional one part implant applied for prosthetic artificial lower limb attachment, would cause osteoporosis and thus result in the loose and extrusion, and then the malfunction of the implant. To improve the structure of the implant, a new type of implant—multi-part implant was developed in this article. Based on CT data and under the maximal load during a normal walking cycle, 3D finite element analysis (FEA) was carried out to analyze the stress of bone around the new implant in three cases of distally truncated femur at high position、middle-position and low-position. Results reveal that stress shielding and stress concentration under the new type of implant reduced effectively compared with the traditional one-part implant, and the stress distribution is much close to the natural bone. Application for distally truncated femur at middle-position and low-position was much better, while stress concentration was marked at high-position. Meanwhile, the stability in vivo can also be maintained with the multi-part implant. The new implant is promising applied for prosthetic limb
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.288-289.653.pdf
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