Novel unilateral locking lumbosacral vertebrae axial fusion internal fixing system

Abstract

The invention belongs to the technical field of medical devices, and in particular relates to a novel unilateral locking lumbosacral vertebrae axial fusion internal fixing system. The system includesan axial screw, a unilateral locking screw and a positioner; a through hole 1 is arranged in the axial screw, the axial screw includes a spiral part, a columnar part and a tail cap arranged in sequence, the connection position of the columnar part and the spiral part is provided with a transition part, the side wall of the transition part is provided with a plurality of through holes 2, the through hole 1 communicates with the outside through the through holes 2, the columnar part is provided with a through hole 3, the angle between the axis of the through hole 3 and the axis of the through hole 1 is alpha, and the angle of the alpha is the same as the angle of a complementary angle of an intervertebral disc angle of lumbar 5 sacral 1; the exterior of the unilateral locking screw has a threaded structure, and the interior has a hollow structure; the positioner is in the shape of a fishhook(right) and includes a horizontal part and a long vertical part and a short vertical part perpendicular to the horizontal part, the short vertical part has a hollow structure, so that a screw connector can conveniently pass through the hollow structure to be connected to the columnar part of the axial screw, a through hole 4 is arranged in the end part of the long vertical part, so that the unilateral locking screw can conveniently pass through the through hole 4 to be inserted into the through hole 3.

Description

technical field [0001] The invention belongs to the technical field of medical devices, in particular to a unilateral locking lumbosacral axial fusion internal fixation mechanism. Background technique [0002] In 2004, Cragg et al first reported the percutaneous lumbosacral anterior fusion internal fixation system——AxiaLIF system (percutaneous lumbosacral anterior fusion internal fixation system), which is an axial lumbosacral fusion fixation system through the posterior rectal space approach. Internal fixation system for anterior column fusion. AxiaLIF creatively performs axial fusion and fixation of the lumbosacral spine through the anterior approach of the sacrum, completes intervertebral discectomy and endplate treatment through the bony channel implanted with axial screws, and completes the middle lumbosacral spine by using unequal thread spacing of the axial fixation screws. The shaft is stretched, the height of the intervertebral space and the curvature of the lumbar...

AI Technical Summary

Problems solved by technology

[0003] Practice has proved that AxiaLIF provides a minimally invasive solution with satisfactory curative effect for lumbosacral degenerative diseases. However, during the clinical application of this internal fixation system, internal fixation subsidence, loss of lumbar curvature, and even axial fusion occurred. In order to improve the stability and fusion rate of the fixed segment, auxiliary percutaneous posterior fixation is often required, but the combination of AxiaLIF and posterior fixation increases the operation steps, prolongs the operation time, and the treatment cost is higher

At the same time, the increase of internal fixation will easily lead to axial screws affecting the placement of posterior internal fixation. When the position of posterior internal fixation is not good, its biomechanical stability is relatively poor, and it is easy for axial screws to loosen and pass through the upper endplate.

These deficiencies increase the incidence of surgical complications

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