Femoral neck fracture fixing device

Abstract

The invention discloses a femoral neck fracture fixation device. The device includes a core rod, a plurality of blades and a locking component. The distal end of each blade contains an outwardly protruding front flange part which is matched and supported by the the inner wall of the bone cavity in a corresponding position. Positioning grooves are axially formed in the outer side of the core rod, the core rod is inserted into the center of the bone cavity and enables the back of each blade to be embedded in the corresponding axial positioning grooves in a matched manner, the core rod is used tosupport the corresponding positions on the inner wall of the bone cavity, and the rear end of the core rod is fixed at the base of the femoral neck. The blades fit the inner wall of the femoral neckinto the bone cavity first, and the destructiveness of the loose bone in the multiple bone cavity is minimized. Appropriate blades are selected and can be fitted to the enlarged part of the inner endof the femoral neck completely, so that the edge contour of each blade completely fits the inner wall of the enlarged part of the bone cavity. After the back of each blade is supported by the core rod, the blades are supported on the inner wall of the bone cavity of the femoral neck in the radial direction.

Description

technical field [0001] The invention belongs to the technical field of femoral neck fracture reduction and fixation devices, and in particular relates to a femoral neck fracture fixation device. Background technique [0002] Femoral neck and femoral tuberosity fractures are common and frequently-occurring diseases in the elderly. When femoral neck fractures or intertrochanteric fractures are fixed with screws and nail-plate systems, there are many traditional internal fixation methods for femoral neck fractures. Due to difficult operation and many complications, it often leads to joint replacement at the end. The anatomical structure of the femoral neck is special, and there are neck-shaft angles and anteversion angles on different planes, and the position is deep and hidden, which makes it difficult to place the positioning guide pin correctly. When clinical internal fixation is used to treat femoral neck and femoral trochanter fractures, it is necessary to place guide pin...

AI Technical Summary

Problems solved by technology

The inner loose bone part is bulky and less dense. The intramedullary nail fixation on the outer hard bone part has the fixing strength, but the fixing strength on the inner loose bone part is insufficient. In fact, most of the intramedullary nails are in the inner layer of loose bone

The outer diameter of the root and end of the femoral neck is larger than that of the neck, and some intramedullary nails are exposed outside the neck, which leads to the problem of poor firmness of the intramedullary nail fixation

[0004] In the prior art, there is a structure similar to the expansion wire, which supports the inner wall of the bone cavity by spreading the expanded part in the bone cavity of the femoral neck, actually supporting the loose bone part and compressing the loose bone part to the hard bone inner wall, This expansion-type bone pressing device has the following problems: (1) The expansion surface is a curved surface, and the loose bone part cannot be completely peeled off and directly contacts the inner wall of the hard bone, resulting in insufficient firmness after compression; (2) After expansion and compression, it cannot Provide sufficient restraint force of the femoral neck in the circumferential direction, the femoral neck may be dislocated due to rotation, (3) It is very destructive to the loose bone part, when its inner end expands, it destroys all the loose bone parts in the femoral neck bone cavity (4) The expansion part of the inner end cannot completely match the inner wall of the femoral neck bone cavity, and cannot provide sufficient anti-rotation force. In patients with femoral neck fractures, the fracture reduction usually needs to be maintained in the internal rotation position of the lower limbs, and this point is embedded by the acetabulum. It is not a perfect sphere, and the rotation of the body position will bring a large torque to the internal support components, resulting in a point contact between the expanded part of the inner end and the inner wall of the femoral neck, resulting in poor internal pressure firmness

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