Novel knee joint prosthesis with locking mechanism

Abstract

The invention discloses a novel knee joint prosthesis with a locking mechanism. The knee joint prosthesis comprises a tibial platform support, wherein a tibial gasket is arranged at an upper end of the tibial platform support, a dovetail groove is formed in one side of the upper end of the tibial platform support, a dovetail protrusion is arranged on the tibial gasket at a position corresponding to the dovetail groove, a square protrusion is arranged at one end, opposite to the dovetail groove, of the tibial platform support, a square groove is arranged on the tibial gasket at a position corresponding to the square protrusion, a rectangular hole is formed in the square protrusion, an oblong hole is formed in the square groove at a position corresponding to the rectangular hole, and an insertion piece is arranged in the oblong hole and the oblong hole. The knee joint prosthesis greatly enhances connection strength between the tibial platform support and the tibial gasket, reduces fretting between the tibial platform support and the tibial gasket, reduces generation of tibial gasket debris, and reduces occurrence of osteolysis of a patient.

Description

Technical field [0001] The invention relates to the field of knee joint prosthesis replacement, in particular to a knee joint prosthesis with a novel locking mechanism. Background technique [0002] At present, the vast majority of international and domestic knee joint prosthesis replacement operations use total knee joint surgery, that is, the femoral end is installed on the femoral prosthesis, and the tibial end is installed on the tibial prosthesis. The tibia is the most widely used in the prior art. The prosthesis is a combination of tibial plateau support and tibial spacer. During the operation, after the tibial plateau tray is implanted during the operation, push the tibial spacer into the dovetail groove of the tibial plateau tray, and then use the driving tool to drive the spacer into the tibial tray. The connection between the two is to inject Although this method has been widely used, it also has some problems. 1. There is a risk of damage to the tibial spacer during ...

AI Technical Summary

Problems solved by technology

1. There is a risk of damage to the tibial spacer during the operation. Because the tibial plateau support and the tibial spacer are driven in, if the doctor does not push the spacer in place during the operation with inaccurate force, the lock hook of the spacer will be damaged, resulting in the failure of the spacer. The shim cannot be used and has to be replaced with a new shim, which will prolong the operation time and cause pain to the patient; 2. The elasticity of the tibial shim is reduced after the operation, resulting in a reduction in the service life. The material of the tibial shim is high-molecular polyethylene, which has With a certain degree of elasticity, after a certain number of years of use of the screw-in structure, the long-term use of the lock hook of the tibial spacer will cause a decrease in elasticity and strength, and sometimes there will be medical accidents in which the tibial spacer comes out of the tibial plateau support. The patient caused more serious injuries and needed to undergo knee replacement again; 3. After the operation, the tibial spacer was easy to disengage under the limit state, and the drive-in structure itself had certain structural defects. After the joint operation was completed, when the patient bent the knee , the tibial spacer and the tibial plateau bear greater tension, especially when the knee is flexed to the extreme, for example, when the knee flexion reaches 135°, the tension between the tibial spacer and the tibial plateau is the largest, while the tibial spacer and the Only through the locking hook between the tibial plateau support can not bear such a large tension force, it will cause the tibial spacer and the tibial plateau support to disengage, and the knee joint prosthesis needs to be replaced; Fretting occurs, and the friction between the two causes wear debris on the tibial spacer, causing osteolysis

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