A y-shaped branch chain external fixator for long bone deformity correction

Abstract

The invention relates to a y-shaped branched chain external fixator for long bone deformity correction, the external fixator comprises a near-end ring, a far-end ring, a y-shaped composite branched chain and a spin adjusting assembly, the y-shaped composite branched chain is composed of a long branched chain and a short branched chain, and the short branched chain is connected with the top of a lead screw sleeve of the long branched chain through a hooke joint rotating base; the self-rotating adjusting assembly is arranged at the bottom of the far-end ring of the external fixator, so that an independent self-rotating degree of freedom is increased, and when rotational deformity needs to be corrected, the self-rotating adjusting assembly is adjusted firstly to correct the rotational deformity, and then deformity in other directions is corrected. By arranging the y-shaped branch chains and the self-rotation adjusting assembly, the capacity of correcting rotation deformity of the externalfixator is improved, interference and collision between the branch chains and between the branch chains and limbs during deformity correction are avoided, meanwhile, space 6-DOF movement can be achieved, and three-dimensional bone deformity in any space can be corrected.

Description

technical field [0001] The invention relates to an orthopedic parallel external fixator, in particular to a Y-shaped branched chain external fixator for long bone deformity correction. Background technique [0002] External fixator is widely used in orthopedic surgery based on distraction osteogenesis technology. It is a minimally invasive tool with small trauma and wide indications. It provides stable and elastic fixation in the process of limb fracture reduction and deformity correction. Parallel external fixator has high lateral rigidity, which is beneficial to bone healing, but its huge structure surrounding the patient's limbs results in a smaller space in the ring and a larger volume. When performing angle correction, especially large-angle rotation correction, external fixation The space in the ring of the device will be greatly reduced, increasing the possibility of the patient's limb colliding with the drive rod of the external fixator. Once the patient's limb coll...

AI Technical Summary

Problems solved by technology

Parallel external fixator has high lateral rigidity, which is beneficial to bone healing, but its huge structure surrounding the patient's limbs results in a smaller space in the ring and a larger volume. When performing angle correction, especially large-angle rotation correction, external fixation The ring space of the device will be greatly reduced, increasing the possibility of the patient's limb colliding with the drive rod of the external fixator

Once the patient's limb collides with the rod, the orthotic procedure cannot continue, resulting in interruption of the previous orthotic strategy

Images