Device for preventing osteonecrosis after femoral fracture

Abstract

The invention discloses a device for preventing osteonecrosis after femoral fracture, and relates to the technical field of fracture fixing devices. The device comprises a hollow nail, at least one first barbed nail and a driving assembly, external threads are arranged at the far end of the hollow nail, the first barbed nails are movably arranged on the peripheral side of the hollow nail, the moving stroke of the first barbed nail is provided with a containing station sunken in the hollow nail and a fixing station protruding out of the hollow nail, the first barbed nail is pricked into the femur between the fracture section of the femoral neck fracture and the far end of the hollow nail at the fixing station, the driving assembly is used for driving the first barbed nail to be switched between the containing station and the fixing station, and the operating end of the drive assembly is located at the proximal end of the hollow nail. Only one inserting hole needs to be drilled in the femur, when the connection between the external threads and the round femur head is loosened, the first barbed nail at the fixing station can also continuously pressurize the fracture section, the anti-rotation performance of the hollow nail is greatly improved, the fracture position is firmly fixed, and the risks of femur non-connection and osteonecrosis are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of fracture fixation devices, in particular to a device for preventing osteonecrosis after femur fracture. Background technique [0002] Femoral neck fracture is a clinically common type of fracture that occurs mostly in the elderly. The incidence of femoral neck fracture is high. At present, internal fixation is often used for treatment, but postoperative nonunion and femoral head necrosis occur from time to time. One of the main The reason is that the fixation method for the fractured femoral neck in the treatment is not optimized enough. [0003] For example, the announcement number is CN108720914B, the announcement date is 20201127, and the invention patent titled "A Femoral Neck Fracture Fixation Device" describes three existing fixation methods for femoral neck fractures in its background technology: ① Using three hollow pressurized Screws fix femoral neck fractures; ② use dynamic hip screws to treat ...

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Problems solved by technology

[0004] In the above prior art, in order to achieve more stable fixation of the femoral neck fracture in the methods ①, ③, and ④, multiple fixation nails are used, which must drill a plurality of fixation nail insertion holes on the femur, causing artificial damage to the femur. Larger, and cause multiple secondary damages to the section of the femoral neck fracture, more growth factors and substances need to be consumed during the fracture healing process, which increases the risk of nonunion and osteonecrosis; method ②Mediolateral angulation The installation of the steel plate will greatly increase the exposure range of the operation, and the anti-rotation performance is poor, and the femoral head is easy to rotate and shift after operation, resulting in internal fixation failure.

Furthermore, in methods ①②③④, there is a common defect, that is, the connection between the fixation nail and the round femoral head at the proximal end of the femur is entirely dependent on the external thread at the distal end of the fixation nail screwing into the round femoral head, especially for the elderly In the representative osteoporotic patients, the connection between the distal end of the fixation nail and the round femoral head is not strong enough, especially during the long recovery period after surgery, it is easy to loosen, resulting in the failure of the fixation nail to continue to pressurize the fracture surface. Further increases the risk of nonunion and necrosis

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