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A Novel Engineering Spherical Bearing, with Potential Application for a hip Implant

Journal of Mechanics Engineering and Automation 2016年第5期6卷 217-226页

作者： Virgil Florescu Lucian Capitanu Liliana-Laura Badita Viviana Filip The Mechanical Department Institute of Civil Engineering Bucharest 010153 Romania The Tribology Department Institute of Solid Mechanics of the Romanian Academy Bucharest 010141 Romania INCD-Mechatronics & Measurement Technique Bucharest 021631 Romania Institute of Multidisciplinary Research for Science and Technology Valahia University of Targoviste Targoviste 130004 Romania

It is a research which could enter into contradiction with the current trend concerning the hip implants. It is known as sliding friction, which is characteristic of present artificial hip joints, is higher than in the case of rolling friction. The paper reports the studies of the functioning mode of a novel spherical bearing MoM （metal on metal） with rolling friction, with potential application for an artificial hip joint obtained by introducing a number of balls between the femoral head and the acetabular cup. After over 15 years of research upon the functional principle and constructive solution, a version that offered a coefficient of minimum friction in the hip joint came to light. This version was based on a constructive solution of motion with lower friction, ＂Omnitrack~ movement solutions＂, which has been modified and rebuilt to be used as a joint of a total hip prosthesis--MOMJ. The joint was built entirely in stainless steel, SS316L medical grade. Tests have been carried out on the experimental laboratory devices that showed very low values of the coefficient of friction （μ = 0.0225）. For validation, the prosthesis had to be put through tests for 500,000 cycles, in terms of physiological motion and dynamic loading, according to ISO 14242-3. Testing was conducted on a multiaxial dynamics machine, MTS Bionix, equipped with system for hip implant testing. The testing results of this total hip prosthesis with rolling friction have been successful in signing up for a friction moment of 0.525 kNmm which means a coefficient of friction la = 0.0143, for a joint with femoral head diameter 28 mm.

关键词： Spherical joint total hip prosthesis rolling friction balls femoral head surface wear Omnitrack movement solutions laboratory testing.

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Friction and Wear Behavior of Ti-6Al-7Nb Biomaterial Alloy

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Journal of Biomaterials and Nanobiotechnology 2013年第4期4卷 374-384页

作者： Mamoun Fellah Omar Assala Mohamed Labaiz Leila Dekhil Alain Iost Surface Engineering and Tribology Team Laboratory of Metallurgy and Engineering MaterialsBADJI Mokhtar-Annaba UniversityAnnabaAlgeria Laboratory of Formability and Metallic Materials BADJI Mokhtar-Annaba UniversityAnnabaAlgeria Laboratory of Metallurgy ARTS ET METIERS ParisTechLilleFrance

Titanium has been increasingly applied to biomedical application because of its improved mechanical characteristics, corrosion resistance and biocompatibility. However their application remains limited, due to the low strength and poor wear resistance of unalloyed titanium. The purpose of this study is to evaluate the friction and wear behavior of high-strength titanium alloys: Ti-6Al-7Nb used in femoral stem (total hip prosthesis). The oscillating friction and wear tests have been carried out in ambient air with oscillating tribotester in accord with standards ISO 7148, ASTM G99-95a, ASTM G 133-95 under different conditions of normal applied load (3, 6 and 10 N) and sliding speed (1, 15 and 25 mm.s-1), and as a counter pair we used the ball of 100C 6, 10 mm of diameter. The surface morphology of the titanium alloys has been characterized by SEM, EDAX, micro hardness, roughness analysis measurements. The behavior observed for both samples suggests that the wear and friction mechanism during the test is the same for Ti alloys, and to increase resistance to wear and friction of biomedical titanium alloys used in total hip prosthesis (femoral stems) the surface coating and treatment are required.

关键词： Tribological Behavior Friction and Wear Tests Biomaterial total hip prosthesis Ti-6Al-7Nb

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