Three-link-parallel-connection external fixator for tibia malformation correction

Abstract

The invention provides a three-link-parallel-connection external fixator for tibia malformation correction. The three-link-parallel-connection external fixator comprises a proximal ring, a distal ring, a proximal-ring connection base, hooke hinges, three adjustment branch links, first adjustment assemblies, second adjustment assemblies, kirschner wires and kirschner wire clamps. The proximal ringand the distal ring of the external fixator are perpendicularly fixed to the deformed tibia through the kirschner wires respectively. The adjustment branch links are composed of the first adjustment assemblies and the second adjustment assemblies, and the first adjustment assemblies and the second adjustment assemblies are provided with adjustment nuts, the adjustment branch links can be extendedor shortened by rotating the first adjustment nut and the second adjustment nut, the distal ring can conduct spatial 6-DOF movement relative to the proximal ring accordingly, and any-space three-dimensional bone malformation can be corrected. According to the three-link-parallel-connection external fixator, three-link design is adopted to form a 3-PUPU parallel connection structure with 6-DOF, andthe three-link-parallel-connection external fixator has the advantages of being simple in structure, small in motion branch link number, large in working space, convenient to operate and not prone tobranch link interference.

Description

technical field [0001] The invention relates to the field of orthopedic orthopedic instruments, and more particularly relates to a three-bar parallel external fixator for tibial deformity correction used for fracture reduction and limb deformity correction. Background technique [0002] In recent years, the number of patients with lower extremity fractures and deformities has been increasing. According to the second national census of the disabled, the total number of disabled people in the country is 82.96 million, of which 24.12 million are physically disabled, accounting for 29.07% of the total number of disabled people. Fractures and deformities of lower extremities seriously affect people's health and daily life. As a fast and effective treatment method, external fixator can treat a variety of fracture displacement, nonunion and bone deformity clinically. It is widely used as a micro-invasive tool for reduction, fixation, and correction of limb deformities. It has small...

AI Technical Summary

Problems solved by technology

Publication No. US20100312243A1 discloses a space external fixator with 6 branches. Publication No. CN103006302A provides a spherical universal joint and an adjustable bionic external fixator, both of which use a six-bar mechanism with stable structure and high rigidity. However, due to the large number of branch chains, the adjustment of the branch chains may interfere in the process of deformity correction, especially when the external fixator is adjusted for self-rotation, the working space of the external fixator will be greatly reduced, resulting in The phenomenon of collision and interference between branch chains and between branch chains and limbs leads to correction failure or poor clinical correction effect

[0003] Therefore, it is necessary to propose a new type of external fixator with a large working space, simple structure, convenient operation, flexible adjustment, and less interference and collision in view of the problems of the current parallel external fixator with single structure, small working space and complicated operation.

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