Locking screw of minimally invasive lumbosacral vertebrae locking axial fusion internal fixation system

Abstract

The invention discloses a locking screw of a minimally invasive lumbosacral vertebrae locking axial fusion internal fixation system. The locking screw comprises an axial fixing screw and an unidirectional locking screw, wherein the axial fixing screw and the unidirectional locking screw are connected with each other, a plurality of through holes are formed in the axial fixing screw, inner threads are arranged in the through holes, and one end of the unidirectional locking screw is movably connected with the inside of the through holes. The axial fixing screw comprises a screw front portion and a screw rear portion, and a through hole is formed in the screw front portion and the screw rear portion. The locking screw is simple in structure, reasonable in design, and capable of improving anti-rotation stability, a thread portion at the small end of the locking screw is rotatably locked in the through holes in the axial fixing screw for unidirectional locking so that the locking screw is not prone to exit, and the locking screw has the anti-rotation, anti-compression, anti-stretching, and anti-bending functions.

Description

technical field [0001] The invention belongs to the field of medical instruments, in particular to a locking screw of a minimally invasive lumbosacral vertebral axial fusion internal fixation system with locks. Background technique [0002] Lumbosacral fusion is a common surgical method for the clinical treatment of lumbosacral degenerative and unstable diseases. At present, conventional clinical anterior surgery is easy to damage viscera, blood vessels and nerves, while posterior surgery greatly interferes with the physiological functions of the spine and does not conform to the biomechanical structure of the spine. Over the past ten years, with the development of minimally invasive concepts and science and technology, the new minimally invasive anterior lumbar surgery represented by laparoscopic anterior keyhole, minimally invasive small incision, percutaneous internal fixation and fusion has made great progress. . [0003] At present, the internal fixation of lumbosacra...

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Problems solved by technology

[0004] However, in clinical studies, it has been found that although the internal fixation of lumbosacral axial fusion has better flexion and lateral stability, it has poor rotational stability.

In order to improve the stability against rotation, it is often necessary to supplement the internal fixation of the lumbosacral spine with the screw-rod system. In this way, the axial fusion internal fixation and the posterior screw-rod internal fixation are expensive and difficult for many Chinese to afford. The operation is cumbersome, the operation time is long, the trauma increases, and the bleeding also increases

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