2results about How to "Reduce stress shielding effect" patented technology

This invention discloses a femoral prosthesis for the hip joint, belonging to the field of medical device technology. The femoral prosthesis includes a femoral stem and a femoral head movably connected to the femoral stem. The femoral stem includes a rigid stem neck and a flexible stem body. The rigid stem neck and the flexible stem body are detachably connected. One end of the rigid stem neck is movably connected to the femoral head, and the other end is connected to the flexible stem body. By dividing the femoral stem structure into a rigid stem neck and a flexible stem body, and adopting a detachable connection method, the femoral stem forms a longitudinal mechanical partition structure. This reduces the overall stiffness of the stem body while ensuring the strength of the neck, improving the load transfer mode, and reducing stress shielding effects.

A spine internal fixing device with a fusion function comprises a pedicle screw, the pedicle screw comprises a screw body, a screw tail is arranged at the upper end of the screw body, a nut is connected to the screw tail through internal threads, the screw body and the screw tail are of a honeycomb structure simulating cancellous bone, and solid external threads are arranged on the outer surface of the screw body. According to the spinal internal fixation device with the fusion function, a full-assembly simulation cancellous bone honeycomb structure of a pedicle screw rod nut and a matched connecting piece is prepared by adopting a 3D printing technology, and meanwhile, solid structures of key stress parts such as an external thread tip threaded connection surface are reserved so as to guarantee early mechanical fixation strength; after the components are assembled, a continuous bone ingrowth channel is formed, so that the transformation of internal fixation of the spine from temporary mechanical support to permanent osseous fusion is realized, and various intervertebral, intervertebral, posterior lateral and transverse process bone grafting fusion steps in a traditional spine fusion operation can be omitted.