Angle-stabilizing tension lock nail for femoral neck fracture

Abstract

The invention discloses an angle-stabilizing tension lock nail for femoral neck fracture. The overall shape of the angle-stabilizing tension lock nail is that the outer diameters of two ends are larger than the outer diameter of a middle section, a fixing thread is arranged at the top end of a nail body, the tail part of the nail body is locked with a main nail, a nail cap is arranged at the tail end of the nail body, and a hexagonal screwing structure is arranged on the end face of the nail cap; and if the locking degree of the tension lock nail is not enough, another small nail body can be screwed into an open groove formed in the tail of the tension lock nail, so that the tail of the tension lock nail is expanded and then is thickened by 0.1 mm, the locking effect of the tension lock nail and the main nail is further enhanced, and therefore, the angle-stabilizing fixation of the femoral neck fracture is realized. The tension lock nail is reasonable in structure and good in mechanical property, broken end pressurization can be implemented, angle stability of fixation after the femoral neck fracture, greater trochanter vertex nail entering, fracture line leaving and no interference on fracture end blood supply can be achieved, shearing force caused by early exercise can be completely resisted, compared with fulcrum inward movement of an extramedullary locking system, the length of a shearing force arm is greatly reduced, and meanwhile, the nail withdrawing effect when necessary is kept.

Description

technical field [0001] The invention belongs to the technical field of medical equipment, and in particular relates to a femoral neck fracture angle-stabilized tension locking nail. Background technique [0002] With the aging of the society, the incidence of osteoporosis and the resulting femoral neck fractures is gradually increasing. Once the femoral neck fractures, most of the blood supply system of the femoral head is destroyed, and the mechanical length available for fixation is short. , relatively large shear force, difficult to effectively fix, prone to nonunion and femoral head necrosis. At present, the most commonly used internal fixation devices for the clinical treatment of femoral neck fractures are three hollow threaded screws, proximal femoral locking plates, and reconstruction nails. The advantage of using three hollow threaded screws is that the nail body is thinner, less damage to the blood supply, less growth space occupied, less damage to the femoral nec...

AI Technical Summary

Problems solved by technology

The advantage of using three hollow threaded screws is that the nail body is thinner, less damage to the blood supply, less growth space occupied, less damage to the femoral neck, and good pressure on the broken ends, which is conducive to healing; However, the defect is that the nail body is fixed to the femoral neck through the greater trochanter. The greater trochanter is mostly cancellous bone, and the femoral neck is also dominated by loose bone. The loose bone has little holding force on the screw. It is easy to shift in the stromal area, so that the overall fixation of the femoral neck fracture has no angular stability. Once the nail body is angularly stable and unstable, it will loosen and shift, and the broken end will grow slowly, which may even cause nonunion or femoral head necrosis.

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