External fixing device for knee joint

Abstract

The invention discloses an external fixing device for a knee joint; the external fixing device comprises a tibial upper fixing member, a tibial lower fixing member and a tibial fixing member; the tibial upper fixing member and the tibial lower fixing member are universally connected or supported by at least one main support rod and one secondary support rod, so that the external fixing device canadapt to high tibial osteotomy to open different angles of the inner side of tibia according to the needs of different patients; a joint member is arranged between the tibial fixing member and the tibial upper fixing member, to counteract the pressure applied on the inner side of a tibial plateau by femur; the joint member contains a bulge that can roll and slide relative to one bearing seat of the joint member, so that with rolling and transverse movement of the femur on the tibial plateau during knee joint movement, and the external fixing device is the external fixing device applicable to high tibial osteotomy or knee joint cartilage tissue repair surgery for legs of a patient.

Description

technical field [0001] The invention relates to a knee joint external fixation device. Background technique [0002] At present, for knee joint lesions, in addition to replacing the artificial knee joint, patients can also choose high tibial osteotomy (HTO, High Tibial Osteotomy) or knee articular cartilage tissue repair surgery to eliminate the lesion. [0003] High Tibial Osteotomy (HTO, High Tibial Osteotomy) is to obliquely cut a slit close to the upper platform of the tibia and spread it to form a wedge-shaped angle. Painful lesions in the knee joint. After high tibial osteotomy, there are usually two fixation methods for the osteotomized tibia. One is an internal fixation device, which is usually locked and connected to both ends of the tibial bone with an integrally formed metal plate. , and is sutured and covered in the skin. In this method, the metal plate is used for fixing. Because it needs to be implanted inside the human tissue, the patient is prone to adverse...

AI Technical Summary

Problems solved by technology

[0006] 1. The upper fixing part U, the middle part M, and the lower fixing part D are in a straight line, and the resultant force F borne by the tibial upper platform T1 is completely transmitted downward along the straight line, that is, the middle part M only uses a single fulcrum That is, the upper fixing member U is supported by the ball part U1. However, during the rehabilitation period of the patient, the osteotomized tibial tissue has not yet stabilized, and the cut and opened gap has not yet healed. When the patient is exercising, The weight w will not be evenly applied to all parts of the upper tibial platform T1. Therefore, the uneven force is only supported by a single fulcrum, that is, the ball part U1, which will easily cause the generation or displacement of the upper tibial platform T1, changing the original The corrected knee joint axis is unfavorable for the recovery of the patient, and even leads to the failure of the operation

[0007] 2. Since the upper and lower fixing parts U, D and the middle part M are arranged in a straight line, the pins limited to fix the tibia will also be locked on the tibia in a straight line, and cannot be locked into the tibia at multiple angles, so the entire set of external Fixtures are less stable

[0008] When a patient chooses to undergo knee articular cartilage repair surgery, if Figure 17 As shown, the femoral fixation piece 7 is usually fixed to the F end of the femur, and a tibial fixation piece 8 is fixed to the T end of the tibia, and a pivot P is used to connect the femoral fixation piece 7 and the tibial fixation piece 8, although the pivot Axis P can provide femur F and tibia T to swing relative to pivot P. However, according to human body structure, when knees are bent or squatting down, the lower end of femur not only has a rolling motion relative to the tibia, but also slightly slides forward movement, such as Figure 17 As shown by the dotted line, since the position of the pivot P is fixed and can only provide pure rotational movement, it cannot allow sliding movement between the femur F and the tibia T. Therefore, after the patient is installed with the external fixation device, he cannot carry out large-scale surgery normally. Bend the knees or squat at an angle, causing great inconvenience to the patient's postoperative life, and it is obviously necessary to improve

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