IN IN3428MU2014A
This invention deals with the development of machine which can be used for fatigue testing of customized hip implant. In Total hip replacement (THR) a diseased hip joint is replaces with implants. The fatigue process begins with the accumulation of damage at a localized region or regions due to alternating loads, which eventually leads to formation of cracks and their subsequent propagation. When one of the cracks has grown to such an extent that the remaining section of the material is insufficient to carry out the applied load, a sudden failure or fracture takes place at that point. The objective of the designing process is to develop such a system which is capable of applying continuous cyclic loading on the hip implant after a fixed interval of time. For Loading of the implant a special cam and follower mechanism was developed to apply the forces similar to the gait cycle of human activities like Normal Walking, Down Stair and Up Stair. Following invention is described in detail with the help of Figure 1 of sheet 1 showing an isometric view, Figure 2 of sheet 2 showing front view of the fatigue testing machine and Figure 3 & 4 of sheet 3 showing cam design for normal walking and down stair.
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