Improved proximal femur triangular intramedullary nail capable of realizing limited secondary sliding

Abstract

The invention relates to an improved proximal femur triangular intramedullary nail capable of realizing limited secondary sliding. The improved proximal femur triangular intramedullary nail comprises a main nail, a first lock nail and a second lock nail, wherein the main nail is sequentially provided with a first nail locking hole and a second nail locking hole; and the first lock nail is detachably connected with the first nail locking hole, the second lock nail is detachably connected with the second nail locking hole, limiting holes are formed in the second lock nail, the first lock nail can penetrate through the limiting holes, the first lock nail, the second lock nail and the main nail form a triangle, and the first lock nail can move in the limiting holes. The improved proximal femur triangular intramedullary nail has the advantages that anti-rotation function of a head and neck bone block can be met, the fixing stability can be improved, limited sliding can be achieved, a lag screw can slide backwards within a certain range, the head and neck bone block and a tuberosity part can form good bone contact after load bearing, bone nonunion caused by gaps is avoided, and besides, excessive sliding, head and neck shortening and screw penetrating out of the femoral head can be avoided. In addition, the first lock nail can penetrate through the long circular limiting holes more easily than a circular hole.

Description

technical field [0001] The invention relates to the technical field of data centers, in particular to an improved proximal femoral triangular intramedullary nail capable of limited secondary sliding. Background technique [0002] Because elderly patients have different degrees of osteoporosis, minor trauma or falls can lead to marrow fractures, including femoral neck fractures, femoral intertrochanteric fractures, etc. Therefore, marrow fractures are common fracture sites in the elderly. The main complications of internal fixation are varus deformity of the marrow joint after internal fixation, and the screws are cut out from the femoral head. After long-term clinical experience, it is found that the main reason for the failure of the proximal femoral intramedullary nail is due to osteoporosis in elderly patients. Inaccurate internal fixation and insufficient stability in the later stage of fixation. In addition, the slidable screws can make the fracture ends interfere with...

AI Technical Summary

Problems solved by technology

The intramedullary nail system provided by this patent document for the treatment of proximal femoral fractures also uses the principle of proximal triangular stabilization and compression to reduce femoral neck shortening, head and neck varus and even Cutting and other symptoms, and the head screw is provided with a limit groove, which is used to abut against the end of the locking bolt. The setting can make the proximal femoral bone block slide in a limited way, but it is obvious that it still has the possibility of slipping without the limiting groove, so the function of the limiting groove is to use its concave The groove-shaped structure restricts the displacement of sliding, that is, the displacement along the direction of the nail head. The limiting groove does not provide enough degrees of freedom to achieve multi-directional sliding support.

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