Primary total ankle joint prosthesis

Abstract

The invention relates to a primary total ankle joint prosthesis. The prosthesis comprises a tibia prosthesis, a talus prosthesis and a sliding liner arranged between the tibia prosthesis and the talusprosthesis, an anti-shaking assembly connected with the tibia is formed at the upper end of the tibia prosthesis, the lower end of the tibia prosthesis is connected with the sliding liner, the upperend of the talus prosthesis is movably matched with the sliding liner, and the lower end of the talus prosthesis is fixed in the talus; the anti-shaking assembly comprises a square boss at the upper end of the tibial prosthesis, the cross section of the square boss is gradually decreased from top to bottom, and the longitudinal section of the square boss is gradually decreased from front to back.According to the invention, by connecting the square boss of the tibial prosthesis with the tibia, the contact area of a plane between the tibia prosthesis and the tibia is increased, and the stability of total ankle joint prosthesis implantation is increased; according to the shape of the square boss and the stress of movement of the ankle joint, the square boss and the groove are matched compactly, the whole ankle joint prosthesis is prevented from loosening and disengaging, the service life of the whole ankle joint prosthesis is prolonged, and more harms to a patient caused by a secondary operation are avoided.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to a primary total ankle joint prosthesis. Background technique [0002] The ankle joint is composed of the articular surfaces of the lower ends of the tibia and fibula and the trochlea of ​​the talus, so it is also called the talus calf joint. For the clinical treatment of ankle necrosis, fixation, arthrodesis and artificial total ankle prosthesis replacement are usually used to restore joint function to varying degrees. For example, the patent application with the publication number CN203724275U describes a foot-ankle joint prosthesis, which first removes the necrotic part of the lower end of the tibia of the ankle joint, and creates two parallel circular grooves, and then implants the above-mentioned prosthesis into the parallel circular grooves Then, the surface of the osteonecrosis of the talus was resected, and the above-mentioned prosthesis was implanted ...

AI Technical Summary

Problems solved by technology

Because the ankle joint is a load-bearing joint, after the above-mentioned prosthesis is implanted, the implanted part is an equi-cylindrical structure. With the movement of the patient's ankle joint, the cylindrical structure moves slightly for a long time, and it is easy to loosen and fall out, resulting in replacement failure and requiring reoperation

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