A center-rotating external fixator for ankle-foot deformity correction

Abstract

The invention relates to a fixed-rotation-center external fixator for ankle-foot malformation correction. The fixed-rotation-center external fixator comprises a near-end ring, a far-end ring, two telescopic branch chains, one fixed-point rotary branch chain, an annular guide rail and a kirschnner wire assembly. Kirschnner wires rigidly fix the near-end ring and the far-end ring with the tibia andthe foot respectively, the two telescopic branch chains are fixed to the front sides of the rings, the fixed-point rotary branch chain is fixed to the rear sides of the rings and connects the near-endring and the far-end ring, and the annular guide rail is arranged at the near-end ring; by adjusting a slide block of the annular guide rail and movable pairs on the branch chains, the far-end ring can achieve spatial six-degree-of-freedom movement, the rotation center of the far-end ring points to the rotation center of the ankle joint all the time, and any spatial three-dimensional ankle-foot malformation can be corrected. According to the fixed-rotation-center external fixator, the design of the three branch chains is adopted, a 2-PUPS / PUPRRR parallel structure is formed, the fixator has six degrees of freedom, it can be achieved that the rotation center coincides with the ankle joint all the time, requirements of different patients can be met, and the fixed-rotation-center external fixator has the advantages that the structure is simple, the number of the movement branch chains is small, the working space is large, and interference is not easily caused.

Description

technical field [0001] The invention relates to an orthopedic external fixator, in particular to a fixed-rotation external fixator for ankle-foot deformity correction. Background technique [0002] Ankle-foot deformity seriously affects people's life and health. External fixator is widely used in orthopedic surgery. It is a micro-invasive tool for reduction, fixation and correction of limb deformities. It has small trauma and wide indications. fixed. Hardware-related infections can be avoided due to less tissue trauma, less blood loss, and less metal implants in the wound. In the traditional method, when doctors correct ankle-foot deformities, they usually configure the external fixator based on their experience, and propose an adjustment plan for the joint branch chain before the operation. After the operation, the patient manually adjusts each joint branch chain according to the adjustment plan every day. Adjust until the deformity is completely corrected. Publication ...

AI Technical Summary

Problems solved by technology

However, the existing external fixators have problems such as single structure, low adjustment accuracy, small working space, and easy interference between branch chains.

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