The constructions of implant joints on basis of elastic hydrodynamic theory of lubricant

摘要

Till now there are no man-made joints exist, which can be made in image and likeness of elastohydrodynamic implant joint. In joint constructions the contact pressures zone, thickness and temperatures contact layer doesn't take in consideration. The elastohydrodynamic frictional joint experience of knowledge isn't taken in consideration sufficiently. The knee implants of elderly people get loose, the clearance and depreciation become bigger in the course of time. The bones loss the mass and thin, as a result of osteoporosis, and there is an increase of bending moment, torque and wear of joint (J. P. Kretzer, E. Jakubowitz, K. Hofmann, J. Reinders, "Altered wear behavior of artificial knee implants", Laboratory of Biomechanics and Implant Research, Department of University of Heidelberg, Germany. The World Congress on Medical Physics and Biomedical Engineering, on September 7 - 12, 2009, in Munich, Germany). We've developed such methods: - methods of measurements of hydrodynamic pressures developing in the lubricant layer on friction surfaces, 1957, direct measurements over the bearing's circumference: - method and sensors for measurements of clearance and pressure or supporting film of lubricant in plain bearings, direct and continuous measurements over the bearing circumference, which do not require interpretation by using calibration curves, 1979: - sensor for the temperature measuring of lubricant film in plain bearings, direct and continuous measurements over the bearing's circumference: the sensor is capable of measuring the lubricant's film temperature directly using infrared radiation. 1978. - test bed for plain bearings, 1960. - sensors for determination of standard elasticity modulus of plain bearings continuous, over circumference of the bearing material, direct measurement modulus by optic method. 1991. - developed the experimentally grounded theory of the Thermoelastohydrodynamic Lubrication of tribosystems of human joints and based on it half-empiric calculations, 2000. - Created constructions of human joints are practical in surgical using on base of thermoelastic hydrodynamical theory of plain bearing with leveling of contact hydrodynamic joint zone, equal firm joint from polymer composite materials, joint off Vlastopulo V.I. for controlled friction of tribosurfaces, 2009.