Posterior pelvic ring fracture minimally-invasive fixator

Abstract

The invention relates to the technical field of medical devices, particularly to a posterior pelvic ring fracture minimally-invasive fixator which is used for the fixation of unstable posterior pelvic ring fractures such as sacroiliac dislocation or sacrum fractures. The posterior pelvic ring fracture minimally-invasive fixator is composed of a connection rod and fixing screws. The connection rod comprises a left connection rod (1) and a right connection rod (2), the left connection rod and the right connection rod are respectively composed of a threaded portion and an unthreaded portion and are connected into a whole through the connection of a threaded portion (3) and a threaded portion (4). The unthreaded portions at both ends of the connection rod are respectively provided with screw holes A and screw holes B, a needle guide channel is arranged in the center of the connection rod, and the tail end of the fixing screw (6) is a nut (7). The posterior pelvic ring fracture minimally-invasive fixator is simple in structure, easy to operate, minimal in invasion, beneficial to the healing of a wound and good in counter-rotation effect, can provide a reliable reduction fixation, and can effectively fix unstable posterior pelvic ring fractures such as the sacroiliac dislocation and the sacrum fractures, thereby facilitating restoring to a normal anatomical structure.

Description

technical field [0001] The invention relates to the technical field of medical devices, and relates to a minimally invasive fixer for posterior pelvic ring fractures used for the fixation of unstable posterior pelvic ring fractures such as sacroiliac joint displacement or sacral fracture. Background technique [0002] The pelvis is a circular structure. Damage to the anterior and posterior rings is likely to cause pelvic instability, especially the damage to the sacroiliac joint complex in the posterior ring leads to rotational and vertical instability. Without effective treatment, the normal anatomical structure cannot be restored, which will lead to Later complications such as deformation, affected pelvic weight transmission, hip pain, iliac joint pain, unequal length of lower limbs, and claudication. At present, the fixation methods used clinically for the treatment of unstable posterior pelvic ring fractures mostly use sacroiliac screws and internal fixation plates. The...

AI Technical Summary

Problems solved by technology

The sacroiliac screw is a relatively thick screw with a guide pin channel in the center. Since the sacroiliac joint of the pelvis is divided into the left sacroiliac joint and the right sacroiliac joint, and the sacral vertebral body is located between the left and right ilium, when the sacrum When the vertebral body is fractured, the fixation method is as follows: screw two sacroiliac screws through the guide pin channel respectively from the left and right ilium to the sacral vertebral body through the sacroiliac joint under the guidance of the guide pin, so that the left ilium passes through the left sacrum The iliac joint is fixed together with the left side of the sacral vertebral body, and the right ilium is fixed together with the right side of the sacral vertebral body through the right sacroiliac joint to achieve the purpose of reduction and fixation. With the addition of fixation, the sacral vertebral fracture site is prone to dislocation due to movement, and the sacral nerve is easily damaged when the screw is screwed in, and the requirements for intraoperative perspective are relatively high, so the incidence of surgical complications is relatively high

Plate internal fixation uses plates and screws to fix the left and right ilium, that is, the two ends of the plate are fixed to the left and right ilium with screws, and the screws are respectively fixed to the left and right ilium via the sacroiliac joint and the vertebral body of the sacrum Together, so as to achieve the purpose of reduction and fixation of the fracture, its advantage is to make up for the defect that the sacroiliac screw fixation cannot fix the left and right ilium, but the disadvantages are: 1) It takes a long time to insert the steel plate. Large incisions make it difficult to expose from the front, complicated operation, more bleeding, and greater surgical trauma; 2) Both ends of the steel plate are fixed with a screw, which has poor anti-rotation effect; 3) The length of the steel plate can only be selected from different models, and the left and right sides cannot be adjusted. The tightness between the right ilium makes the fracture surface closely fit, which is not conducive to the healing of the fracture and is prone to sequelae

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