Femoral extramedullary positioning device for knee joint replacement

Abstract

The invention relates to a femoral extramedullary positioning device for knee joint replacement, which is characterized by comprising an anterior superior spine fixing bow (1) and a first connecting rod (2), wherein the first connecting rod (1) is perpendicularly connected onto the anterior superior spine fixing bow (1); the other end of the first connecting rod is connected with an osteotomy positioner (3); the positioning device further comprises a measurement rod (4); and the measurement rod (4) is connected with the osteotomy positioner (3).The device has the advantages that: 1) the device is ingenious in overall structure design and convenient to mount, 2) with the adoption of the osteotomy positioner in a precise right angle connecting design and capable of carrying out multiple measurements in the technical scheme, the precision of the device is further guaranteed; and 3) a handle of the osteotomy positioner is designed with complicated and refined bifurcation shapes, groove shapes, scales and small holes.The bifurcation shape design can limit the connecting rod in the positioner and allow the connecting rod to be matched with the positioner in size, and a coronal can be parallel to the connecting rod.

Description

technical field [0001] The invention relates to a positioning device, in particular to a femoral extramedullary positioning device for knee joint replacement, belonging to the field of medical devices. Background technique [0002] Knee replacement is currently widely used clinically. It is a mature surgical technique in joint surgery, and it has an absolute surgical effect on relieving knee joint pain and deformity in elderly patients. However, surgery also brings many risks. Due to the relatively large surgical trauma, post-operative infection, bleeding, and pulmonary embolism have also brought many problems. With the rapid development of knee prostheses today, the key to the efficacy of knee surgery is still the surgical technique, and the accuracy of the force line of knee replacement is closely related to the long-term life of the prosthesis. The tibial positioning system is currently recognized as extramedullary positioning. Because the tibial shaft is relatively supe...

AI Technical Summary

Problems solved by technology

[0003] Traditional femoral intramedullary positioning increases intramedullary hemorrhage, and is closely related to the needle entry point, the insertion depth of the intramedullary rod, the thickness of the femoral medullary cavity itself, and the anterior arch or outer arch of the femoral shaft. Most domestic physicians choose 5°, 6° ° or 7° valgus angle for positioning, most of which are selected according to the preoperative measurement angle, but clinical cases with extremely large measurement angles, such as cases of femoral malunion, are limited by the positioners of various prosthesis companies. The grasp of the bone angle is often not accurate enough or even impossible to operate, and is affected by preoperative X-rays. For example, there are often large errors in the preoperative measurement of non-standard position X-rays, and this measurement method only focuses on the positioning of the coronal position, ignoring positioning accuracy in the sagittal position

[0004] The advantage of navigation positioning is that there is no need for reaming, which reduces the bleeding of the medullary cavity. Although navigation positioning reduces the error, the operation time is greatly prolonged. Although clinical control studies have found that it has a significant improvement in the line of force, it also increases The risk of surgical infection, and due to the long learning curve of surgery and the high cost of navigators, it has not been widely used until now

[0005] Knee joint prosthesis companies are equipped with some measuring instruments for extramedullary positioning. However, due to the design constraints of different companies, the positioning rods only point the positioning pins to the femoral head to judge the osteotomy surface. Whether the positioning is rough or not depends on the knee joint. Influenced by the internal and external rotation of the joint, and the osteotomy surface cannot be adjusted quickly

basically unused

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