Intramedullary nail system for treating proximal femoral fractures

Abstract

The invention discloses an intramedullary nail system for treating proximal femur fractures. The system comprises a main nail, a head nail and a supporting nail, the main nail is composed of a near end part, a transition part and a far end part, the head nail penetrates through a head nail hole channel located in the near end part, the supporting nail penetrates through a supporting nail hole channel located in the transition part, and the tail end of the supporting nail abuts against the lower side of the head nail; and the main nail, the head nail and the supporting nail form a triangular structure at the near end of the femur. The intramedullary nail system for treating proximal femur fractures is reasonable in structure, reduces symptoms such as femoral neck shortening, head and neck varus and even cutting caused by fracture part collapse due to postoperative load by using the principle of proximal triangular stabilization and pressurization, and is achieves a good treatment effect.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an intramedullary nail system for treating proximal femur fractures. Background technique [0002] With the aging of the population in China, the number of intertrochanteric fractures in the elderly is gradually increasing. This disease makes people lose the ability to move their lower limbs. Conservative treatment requires long-term bed rest, and there are many complications, which seriously threaten the lives of patients. For unstable intertrochanteric fractures, the femoral intramedullary nail system is currently recommended. [0003] The Chinese patent CN101912299B previously granted by the inventor discloses an integrated intramedullary nail system for treating proximal femur fractures. Since the rectangular head screw (21) in the integrated head screw (2) has a rectangular cross-section, it is In a shaped femoral head, there is a risk of cutting out the femoral hea...

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent CN101912299B previously granted by the inventor discloses an integrated intramedullary nail system for treating proximal femur fractures. Since the rectangular head screw (21) in the integrated head screw (2) has a rectangular cross-section, it is In the shape of the femoral head, there is a risk of cutting out the femoral head

At the same time, the lower support is added to the integrated head screw (2)——the first support screw (3). The first support screw (3) is shorter, which causes the force arm of the head screw to remain unchanged, and it is easy to cause the rectangular head screw to move outward. Slipping, inferior lag screw sliding inwards, risk cutting out femoral head and entering hip joint

Furthermore, the angle of the second support screw (4) is perpendicular to the axial direction of the proximal end of the head screw (11), and its apex is on the inner side of the femur. After the proximal femur is fractured, the inner bone fragment is incomplete or the patient with severe osteoporosis, here It is easy to cause the support screw to break through the inner cortex and cannot play a supporting role

In addition, there are three holes in the proximal end of the head nail (11), which greatly affects the strength, which increases the risk of breaking the proximal end of the head nail (11)

This patent and other intramedullary nails in the prior art only mechanically simulate the triangular structure without pressurization, and there will be obvious stress concentration at the head-nail joint, which will cause the main nail to break at the head-nail joint

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