Combined splint internal fixation device for femoral intertrochanteric fracture and auxiliary aiming apparatus

Abstract

The invention relates to a combined splint internal fixation device for a femoral intertrochanteric fracture and solves the problem that an internal fixation device in the prior art cannot provide strong and biomechanical fixation for the proximal end of femurs. The device is mainly characterized in that an inside distance bone plate is added, a clamping structure that the inside distance bone plate and an outside bone plate are respectively arranged on the inner side and outer side of the femur and clamp the proximal end of the femur is adopted, and the inside distance bone plate is fixed after the external distance bone plate is implanted with screws. Correspondingly, the invention also designs auxiliary aiming apparatus for proper matching use. The auxiliary aiming apparatus is providedwith two clamping claws which can be used for fixing and clamping the inside distance bone plate and the outside bone plate respectively, and screw holes of the inside distance bone plate and the outside bone plate are always kept in concentric positions. The device has the beneficial effect that absolutely stable inside fixation of the inner side and the outer side of the proximal end of the femur can be provided simultaneously, and shear resistance and rotation resistance are high. Besides, the device is simple in design structure and has certain universality with some parts of the existinginternal fixation system.

Description

technical field [0001] The invention belongs to the field of orthopedic medical devices, in particular to a combined splint internal fixation device for femoral intertrochanteric fractures and an auxiliary aiming device. Background technique [0002] Intertrochanteric fracture is one of the most common hip fractures in clinical practice, and it occurs more frequently in the elderly. According to data, its incidence rate accounts for 3-4% of all fractures. At present, there is no unified standard for the treatment of intertrochanteric fractures. External fixation brackets, artificial femoral head replacement and internal fixation systems have developed side by side. In recent years, with the continuous development and improvement of sliding compression internal fixation systems, because of its The dual function of sliding and sliding has become the mainstream of surgical treatment of intertrochanteric fractures. The LCP system (Locking Compresion Plate System) is an internal...

AI Technical Summary

Problems solved by technology

As a unilateral extramedullary internal fixation system, the LCP system has the following disadvantages: there is a large stress concentration at the femoral neck, especially in the middle and lower parts of the femoral neck, and the tensile stress on the outer side of the femoral neck and the compressive stress on the inner side are high. There is a sudden increase in stress when it is close to the surface. The unilateral extramedullary internal fixation system has little effect on reducing the medial compressive stress. The extramedullary fixation method of femoral intertrochanteric fractures has a greater shear force than intramedullary fixation. LCP system Lack of good anti-shear measures; the lack of structural stability of the LCP system is compensated by using more locking screws, which causes greater damage to the bone and affects the blood supply of the trochanter, prolonging the recovery time

Elderly patients are often accompanied by osteoporosis, and insufficient fixation has a greater impact on the success rate of surgery

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