Hip joint femoral stem fatigue test loading device

Abstract

A hip joint femoral stem fatigue test loading device provided by the present invention comprises a base, a lateral deviation block, a pressurizing plate and an embedding cylinder, the lateral deviation block is internally provided with a placing groove for movably placing the embedding cylinder, the lateral deviation block is internally and movably provided with a moving plate, the moving plate is fixedly connected with a stabilizing plate movably extending into the placing groove, and the stabilizing plate is fixedly connected with a clamping plate. The stabilizing plate is in movable contact with the embedding cylinder, the fixing plate is fixedly connected with a suction cup used for sucking the base, an inflation cavity and an air bag which are communicated with each other are arranged in the base, the piston plate is fixedly connected with an impact block, and a sound production piece is fixedly arranged in the sound production cavity. In the use process, the embedding cylinder is movably arranged in the placement cavity, so that the lateral stress on the femoral stem prosthesis can be eliminated during pressurization, meanwhile, the lateral deviation block adsorbs the base through the suction cup and the adsorption is tighter and tighter along with the proceeding of an experiment, and meanwhile, when the femoral stem prosthesis turns over and loosens, a sound can be made to remind an operator.

Description

technical field [0001] The invention relates to the technical field of medical fatigue experiments, in particular to a loading device for fatigue experiments of hip joint femoral stems. Background technique [0002] Fatigue performance is a key indicator of the reliability of surgical implants such as artificial joints. Aiming at the problem of artificial hip joint fatigue performance testing, a special artificial joint fatigue testing device was developed. Based on the device, according to the ISO7206 standard, an in vitro fatigue test was carried out for artificial femoral stem products, and the deformation measurement and three-dimensional Reconstruction; In addition, the finite element calculation of the artificial femoral stem in the sample is carried out, and the simulation results are consistent with the deformation obtained in the test; after 5 million cycles of fatigue tests, the device runs smoothly without abnormality, reaching the design reliability standard, It...

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Problems solved by technology

[0005] 1. Setting steel balls in the middle of the two-layer compression plate on the compression device can indeed offset the lateral stress on the femoral stem prosthesis in the experiment to a certain extent, but the above-mentioned device for offsetting the lateral stress cannot solve the problem well. The problem of lateral stress generated in the experiment;

[0006] 2. In the prior art, the femoral stem prosthesis is fixed in the embedding cylinder by bone cement. The fatigue test of the femoral stem is an experiment that needs to be repeated many times. In the actual operation process, even the femoral stem needs to be fixed. The prosthesis undergoes millions of pressurization tests. If the femoral stem prosthesis deviates during the experiment, it will cause damage to the prosthesis and even lead to the failure of the entire experiment.

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