Combined double-node dislocation-minimally invasive retrograde acetabular posterior column screw positioning sight

Abstract

The invention discloses a combined double-node dislocation-minimally invasive retrograde acetabular posterior column screw positioning sight, which includes a T-shaped bracket. A dislocation adjustingdevice is arranged below the bracket. A sleeve guide device is arranged on the dislocation adjusting device. At least two positioning devices, each of which includes a vertical guiding and positioning combination, are arranged at intervals from top to bottom on a vertical rod of the bracket. The dislocation adjusting device is vertically movably connected with the vertical rod. The sleeve guide device comprises a sleeve perpendicular to the positioning combination. A positioning device on the T-shaped bracket, the dislocation adjusting device and the sleeve guide device are used to determinethe position of the needle insertion point, the needle insertion direction and the screw position of the ischial tuberosity, so that the operation risk is small, the risks and complications such as nerve injury, pelvic organ injury, poor fixation position, unstable fixation and nail breakage are greatly reduced, and one-time success of insertion of acetabular posterior column screws is ensured.

Description

technical field [0001] The invention belongs to the field of medical devices, and relates to a minimally invasive orthopedic treatment device, in particular to a combined double-node misalignment-minimally invasive fracture that requires retrograde lag screw fixation for acetabular posterior column with no or small displacement fractures. Retrograde acetabular posterior column screw positioning aimer. Background technique [0002] The hip bone is the bone of the human pelvis. There are two pieces on the left and right. It consists of three parts: the ilium, the ischium and the pubic bone. There is a large and deep socket called the acetabulum on its outer surface. The acetabulum is located at the top of an arc of an arched structure. This arch is formed by two bony columns, called the anterior and posterior columns, that meet in a thick, strong bony band that lies anteriorly and inferiorly to the surface of the sacroiliac joint. [0003] At present, there are more and more ...

AI Technical Summary

Problems solved by technology

This device can roughly guide the drilling of Kirschner wires, but there are some disadvantages: 1. Since the ischial tubercle, anterior superior iliac spine and posterior superior iliac spine bony protruding points are all one area, and there are individual differences in anatomical structure , so the device determines the direction of the Kirschner wire in the coronal plane relatively roughly

2. The device can only roughly determine the direction of the Kirschner wire in the coronal plane, and lacks guiding parameters in the sagittal plane, so there is a large error, and it is easy to penetrate the bone from the front or back, damage the acetabular articular cartilage, and lose its effectiveness. fixation

3. During the operation of drilling the Kirschner wire, it is difficult to guarantee the successful placement of the Kirschner wire and screw to the ideal position, direction and length at one time, relying entirely on the operator's experience, feeling and the assistance of the C-arm X-ray machine perspective

[0006] In conclusion, minimally invasive percutaneous retrograde acetabular postcolumn lag screw placement lacks objective standards in determining the needle insertion point, needle insertion direction, and screw position and length, and it is impossible to ensure a successful one-time operation. Technically, there are great difficulties and challenges

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