Authors: H. Rahimjanov, A. Rahimjanov, K. Rahimjanov, Vasilevskaya, I. Leontiev

Title of the article: Device for evaluation operability and reliability of endoprosthesis of knee joint models

Year: 2017, Issue: 6, Pages: 181-190

Branch of knowledge: Mechanical engineering and machine science

Index UDK: 621.9.06

DOI: 10.26730/1999-4125-2017-6-183-192

Abstract: The development of endoprosthetics of the joints of the limbs in general and the development and improvement of endoprostheses in particular predetermine the necessity to create technical equipment for the comparative evaluation of new developments. The existing equipment intended for the certification of medical devices, in particular endoprostheses, is expensive and not very suitable for obtaining comparative estimates of the results at the stage of creating the models of a new product. The purpose of this work is to develop a design for a device for assessing the wear of total prosthetic knee joints, the technical capabilities of which would provide loading and displacement parameters in accordance with standards. The design proposed provides the necessary parameters for loading and moving for the endoprosthesis components in the cycle of motion by the corresponding cam profiles. In this case, the synchronization of changes in the axial force, anterior - posterior displacement and rotation angle with the swing angle of the endoprosthesis femoral component relative to the tibial component is realized. Force loading of the endoprosthesis components implemented through a calibrated spring force junction. The experiments should be provided by a specially prepared test environment. The endoprosthesis test algorithm assumes the starting of a motor-reducer motor at a reduced speed of rotation of the output shaft within 15-20 minutes. It has a beneficial effect for the initial run-in of the contact surfaces of the endoprosthesis components. Further a full test cycle realizes 5,000,000 swings of the endoprosthetic femoral component. In accordance with the standard, tests can be completed ahead of schedule with the appearance of signs of destruction of individual components of the endoprosthesis. Thus, the proposed design of the facility allows for comparative assessments of the operability and reliability of the developed models of the endoprosthesis with articular surfaces made of various materials.

Key words: endoprosthesis knee joint wear device femoral component tibial component ceramics

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