Distraction maintenance device for small incision for posterior minimally invasive screw fixation for vertebral column of patient

Abstract

A small incision opening-holding apparatus for use in minimally invasive screw placement by a spinal posterior approach, comprising two intersectedly movably-connected retraction hook strips (1) and a spring (2). The retraction hook strips (1) comprise arc-shaped arms (3) and retraction hooks (4). Connecting ends of the arc-shaped arms (3) of the two retraction hook strips (1) are pivotally connected via a pin, while distal ends are connected to the retraction hooks (4). The retraction hooks (4) have one ends thereof perpendicularly connected to planes of the arc-shaped arms (3), and have the other ends bent inwards. The inwardly bent ends are provided at end faces thereof with crescent-shaped grooves (5). The spring (2) is arranged between the two arc-shaped arms (3). The apparatus is easy to operate, time-saving, and well accepted by physicians, and allows for reduced number of times of repeated exposure of an incision, shortens surgery time, and reduces tissue damages.

Description

technical field [0001] The invention relates to a distraction and maintenance device used for minimally invasive placement of nails and small incisions in the posterior spine, and belongs to the field of medical devices. Background technique [0002] Pedicle screw technology has developed rapidly since its advent in the 1980s, and has been widely used in the surgical treatment of spinal degeneration, spondylolisthesis, spinal stenosis, vertebral fractures, deformities, bone metastases, and spinal instability. . In recent years, small incisions or percutaneous minimally invasive nails have been gradually carried out and widely accepted by clinicians. However, in the case of small incisions, it is still necessary to expose the small incision multiple times for rod installation and distraction, and repeated exposures are required. The exposure process not only prolongs the operation time, but also can form myenteric false tracts and cause muscle damage. [0003] At present, m...

AI Technical Summary

Problems solved by technology

The Quadrant channel also has the problem of repeated exposure during the operation. Although the blades of the Sextant system can play a similar role, it is difficult to install and remove the blades, and the above two systems are very expensive, which limits their promotion.

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