Femoral proximal intramedullary nail

Abstract

The invention discloses a femoral proximal intramedullary nail. The femoral proximal intramedullary nail comprises locking screws screwed into a femoral neck and a main nail, the locking screws and the main nail are all made of non-degradable bioactive materials, the main nail is provided with locking screw holes and a fixing screw hole which are located in the head and tail ends of the main nailrespectively, the locking screws are fixedly connected with the main nail through the locking screw holes, the head ends of the locking screws are sharp, and the portion, close to the head end, of thescrew body of each locking screw is provided with barbed nicks. According to the femoral proximal intramedullary nail, by fixing the locking screws with the main nail and arranging the barbed nicks on the screw bodies of the locking screws, stress performed on the broken ends of a fracture is completely borne by the locking screws and the main nail, so that bone fragments of the broken ends of the fracture are kept stable, the phenomena such as coxa vara, compression of the broken ends of the fracture and screw cutting are prevented from occurring, looseness and falling of the locking screwsare avoided at the same time, and complications caused by the secondary dislocation of the broken ends of the comminuted fracture after an operation can be reduced clinically.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and relates to an intramedullary nail at the proximal end of the femur. Background technique [0002] The design of the gamma nail originated in Europe, and Grosse used the gamma nail to treat intertrochanteric fractures. Since Halder et al. (1992) reported the surgical technique of gamma nail, it has been used as a classic surgical technique till now. Gamma nails combine the advantages of hip sliding compression nails and intramedullary fixation, and are easy to operate, strong in fixation, and have the advantages of dynamic compression, especially the dynamic compression effect formed by the sliding design of the lag screw in the main nail is also more direct . However, many clinicians believe that the dynamic compression effect of the gamma nail is a major factor in the failure of severe unstable intertrochanteric fractures. In the case of Evans I, II, and III fractures, due to the ...

AI Technical Summary

Problems solved by technology

However, for patients with Evans IV fractures, comminuted trochanter, elderly severe osteoporosis, split trochanter, and Parkinson's disease, after fixation with gamma nails, the fracture end will be damaged due to the dynamic compression of the fracture end. Under the action of stress, the fracture can be re-stabilised through compression (that is, the overall decline of the femoral head and lag screws after operation causes the fracture end to be shortened), varus, and screw cutting to achieve re-stabilization of the fracture. The more stable the distortion is, the worse it will be; resulting in fracture displacement, coxa varus, shortening of the affected limb, lag screw retraction, and Parkinson's disease patients due to continuous shaking of the affected limb, leading to early loosening of the lag screw and retraction of the screw Phenomenon, leading to internal fixation failure and other complications

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