Extramedullary fixation block and fixation system for anatomical trochanteric fractures

Abstract

The embodiments of the present invention relate to an anatomical trochanteric fracture extramedullary fixation shaped block and a fixation system. The system includes an internal fixation shaped block, a femoral neck fixation nail and a locking screw; the internal fixation shaped block includes a first fixing part and a second fixing part The first fixing part is connected with the second fixing part: the inner surface of the first fixing part is an arc surface, which is used in conjunction with the femoral neck fixing nail; the second fixing part includes a fixing screw hole and a connecting rod connecting screw hole; the fixing screw hole Used in conjunction with the locking screw, the connecting rod is inserted into the connecting screw hole of the connecting rod. The shape design of the special-shaped block of the invention has a very high degree of matching with the lateral wall of the proximal end of the femur, the proximal end can ensure that at least three femoral neck fixation screws are placed in the femoral neck, and the femoral neck screws have better holding force, two Kirschner wires. The opening is used for quick positioning and temporary fixation, and the distal end is provided with a connecting rod connecting screw hole butt bridge-type internal fixation system, which makes the operation more convenient and promotes fracture healing to the greatest extent.

Description

technical field [0001] The invention relates to the field of orthopedic medical devices, in particular to an anatomical trochanteric fracture extramedullary fixation shaped block and a fixation system. Background technique [0002] Proximal femoral fractures, including femoral neck fractures, intertrochanteric fractures and subtrochanteric fractures, account for about 7.3% of whole body fractures in adults, and up to 23.8% in elderly patients with fractures. As the global population ages, the incidence of proximal femoral fractures increases with age. According to reports, there are about 4.5 million new elderly proximal femoral fractures in the world every year, and the number of patients with proximal femoral fractures worldwide is expected to increase to 21 million in the next 40 years, of which Asians account for about 50% of the global incidence. . The increasing demand for treatment of proximal femoral fractures and the high quality of life of patients have become a ...

AI Technical Summary

Problems solved by technology

First of all, its shape design does not conform to the anatomical and morphological characteristics of the proximal lateral border of the Chinese population, which makes the matching between the module and the proximal lateral border of the femur poor, and it takes a lot of time to confirm the position during the operation. And there is a high requirement for mastery of femoral morphology. Even if the position is confirmed, there will be a large gap between the module and the lateral edge of the femur, resulting in complications such as congestion and infection; secondly, there is a lack of tools for positioning and temporary fixation. Needle opening, it is difficult to quickly and accurately determine the module placement position and the screw insertion boundary

Before the position of the existing module is confirmed by fluoroscopy, a screw needs to be placed for temporary fixation. If further adjustment is required, another hole needs to be drilled on the femur, which artificially increases the damage of the femur. The abandoned drill hole on the femur is due to weak stress area, prone to iatrogenic fractures

This process takes a long time, which greatly increases the difficulty of the operation and affects the prognosis of the patient; third, the position and direction of the screw opening in the proximal part are unreasonable, and it is often difficult to insert at least three screws into the femoral neck

Sometimes, in order to insert three screws forcibly, it is necessary to place the module at a position that does not conform to the lateral edge of the femur, which further increases the gap; fourth, the model is single, and there is a lack of modules of different sizes, so it is difficult to realize the Better fit to the lateral wall of the proximal femur

If the module is too small relative to the femur, it will be difficult to achieve stable and reliable support and fixation; if the module is too large relative to the femur, it will easily irritate the surrounding soft tissues; all of the above deficiencies will increase the difficulty of the operation and prolong the operation time, thus making the operation difficult. Blood loss in the middle and increase in the number of fluoroscopy during the operation will affect the prognosis of the patient

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