Femoral neck fracture fixing device

Abstract

The invention discloses a femoral neck fracture fixing device. The femoral neck fracture fixing device comprises side steel plates, three sleeves, three head nails matched with the sleeves and at least one cortical bone locking screw. The inner surfaces of the side steel plates are matched with the anatomic form of the near-end outer side wall of the thigh bone. The head side of each side steel plate is provided with three conical threaded locking holes, and the tail side of locking the steel plates is provided with at least one cortical bone locking screw. The sleeves of hollow structures. The tail portions of the sleeves are matched with the conical threaded locking holes. The cortical bone locking screws are matched with cortical bone locking screw locking holes. The femoral neck fracture fixing device produces small wounds and is good in fixing effect, simple in operation and accurate in positioning.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to a femoral neck fracture fixation device. Background technique [0002] Femoral neck fracture is a common type of fracture in clinical practice that occurs mostly in the elderly. Femoral neck fractures have a high incidence, accounting for about 3.6% of systemic fractures and 60% of hip fractures. For unstable femoral neck fractures, internal fixation is often used for treatment at present, but the incidence of postoperative nonunion and femoral head necrosis is high, so unstable femoral neck fractures are called "unresolved fractures" . [0003] The following methods are mainly used in the prior art to treat femoral neck fractures: [0004] Method 1, using three cannulated compression screws (CCS, Cannulated Compressed Screw) to fix the femoral neck fracture, see figure 1 . This method is mostly used for stable femoral neck fractures, and some are used for unstable femoral...

AI Technical Summary

Problems solved by technology

[0006] In the process of fixing unstable femoral neck fractures, this method has the following defects: 1. The screws on the lateral wall of the femur lack sufficient holding force, especially for elderly patients with osteoporosis, the tail of the nail is easy to loosen, which can easily cause femoral head varus Deformity; 2. For the lower screw, because the fracture line passes through the thickened cortex on the medial side of the femur, the screw loses the "three-point" support, resulting in insufficient medial support and stress concentration at the lesser trochanter, which can easily lead to varus deformity of the femoral head and subtrochanteric fracture; 3. Although the spatial arrangement of the three screws has certain anti-rotation properties, due to the lack of strong fixation on the outer wall, the screws are easily twisted and deformed in the femoral neck, and the anti-rotation properties are lost; 4. The tail of the screw is fractured in the femoral neck During the healing process, nail withdrawal is easy to occur after bone resorption, which will cause local discomfort to the patient, and in severe cases, may cause nonunion; 5. The three hollow nails must be placed parallel to each other. On the one hand, ground placement cannot guarantee the best screw position; if fluoroscopy is used, it may increase the radiation dose received by the patient

[0008] However, there are the following disadvantages when adopting this method to reduce femoral neck fractures: 1. The surgical exposure range is relatively large, and the patient loses more blood; Rotation and displacement; 3. A single head screw cannot provide sufficient anti-rotation performance, and the femoral head is prone to rotation and displacement after operation, resulting in internal fixation failure; 4. High failure rate

[0010] However, this method also has certain defects, such as: 1. The spatial arrangement of the three screws is not good enough to provide the maximum space-occupying effect; 2. The structure of the three hollow screws cannot achieve continuous postoperative compression, so Ensure the healing of femoral neck fractures; 3. The side plate is non-anatomical, which makes it impossible to achieve rapid and accurate positioning during internal fixation

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