Free connecting type three-branched chain parallel orthopedic external fixing support

Abstract

The invention discloses a free connecting type three-branched chain parallel orthopedic external fixing support, which consists of two fixing rings and three branched chains, wherein the fixing ring is provided with connecting holes which are arranged along the circumferential direction, and the branched chains are provided with two driving moving pairs, a rotating pair and a ball pair. The two fixing rings can be respectively fixedly connected with the bone blocks at both ends of the fracture through metal spicules; the six degrees of freedom relative movement between the fixing rings can begenerated to realize the reduction of fracture according to a certain rule to adjust the driving moving pair of each branched chain. The three branches of the external fixing support can be freely connected between the fixing rings, and the installation is convenient and quick; the number of the branched chains is smaller than that of the general parallel external fixing support, the whole body islight, and the interference to the perspective image is small; the driving pairs of the branched chains can accurately indicate the amount of driving displacement and can lock, reset, and fix the fracture more precisely. According to the external, the external fixing support can effectively improve the clinical application effect of the orthopedic external fixation technology and has important significance.

Description

technical field [0001] The invention relates to the technical field of orthopedic external fixation, in particular to a six-degree-of-freedom parallel external fixation bracket which is composed of three branch chains and two fixation rings and can freely connect the branch chains. Background technique [0002] The orthopedic external fixation bracket percutaneously fixes the fractured end with minimally invasive external fixation pins, which can achieve effective fixation of the fracture site and provide a certain degree of freedom for bone adjustment. At present, orthopedic external fixation brackets and corresponding technologies have been applied in traumatic fracture reduction and deformed bone correction. [0003] The patent US4979348A proposes a parallel external fixation bracket, which is composed of two fixing rings and a plurality of longitudinally parallel threaded rods connected between the fixing rings. The threaded rod passes through the connecting hole of the...

AI Technical Summary

Problems solved by technology

Although the number of branch chains of this kind of external fixation bracket is small, the three branch chains must be installed symmetrically, and the edge processing of the gear teeth used in the external fixation ring is complicated, the weight is heavy, and the accuracy is difficult to guarantee

In addition, the driving joint is difficult to read and adjust accurately, and the practicability is poor

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