Personalized acetabular-bone posterior-column screw-setting drill die prepared through 3D printing and preparation method thereof

Abstract

A personalized acetabular-bone posterior-column screw-setting drill die prepared through 3D printing comprises a body of a triangular frame structure, wherein the body comprises two main positioning pins, an auxiliary positioning pin, a main supporting wall and two auxiliary supporting walls. A preparation method comprises the following steps that 1, target acetabular-bone medical image data is obtained; 2, a central point set of a target acetabular-bone posterior-column zone is obtained; 3, the maximum inscribed cylinder of the target acetabular-bone posterior column is determined; 4, the outer diameter of a bone-connecting screw is initially selected, and the central axis of a corresponding screw-setting channel is determined; 5, the outer diameter of the bone-connecting screw is adjusted and controlled to solve the problem that a guiding drill die channel and an ilium ala possibly intervened with each other; 6, the outer diameter of the bone-connecting screw is further adjusted andcontrolled to meet the, designing, manufacturing and using demand of the screw-setting drill die; 7, a three-dimensional model of the screw-setting drill die is established; 8, the bone drill die is prepared through 3D printing. When the drill die is used for an acetabular-bone posterior-column screw internal-fixation technology, minimally invasive and efficient personalized acetabular-bone posterior-column screw-setting operation can be achieved, screw setting is accurate and safe, the operation is simple and stable, and the instrument cost is low.

Description

[0001] The invention relates to the technical field of medical devices, in particular to a 3D-printed personalized acetabular postcolumn drill template and a preparation method thereof. Background technique [0002] Internal fixation of acetabular fractures is also called open reduction and internal fixation of acetabular fractures. It is indicated for patients with severe acetabular fractures. The acetabular fractures are reduced and internally fixed by surgical methods. Through internal fixation of acetabular fractures, the acetabulum can regain anatomical reduction and reliable fixation of the weight-bearing part, and improve or restore the biological function of the acetabulum. At present, in the internal fixation of acetabular fractures, internal fixation via the anterior or posterior column of the acetabulum is the most reliable fixation method. [0003] In the internal fixation of acetabular fractures, a single anterior approach is adopted, and the internal fixation met...

AI Technical Summary

Problems solved by technology

[0012] 1. In order to position the aimer accurately, all the muscles and other tissues in the acetabulum and ilium region must be stripped to find the landmark points of the iliac tubercle, the corner point on the posterior gluteal line, the entry point of the ilium, and the iliac crest. Auxiliary positioning points on the wing surface, which lead to large wounds and blood loss, increasing the difficulty and risk of surgery;

[0013] 2. The positioning accuracy of the positioning tip of the aimer is poorly maintained. The vibration during drilling during the operation can easily cause the aimer to slip, which affects the positioning accuracy of the aimer, and then affects the accuracy of nail placement;

[0014] 3. In order to plan the posterior column screw placement channel, it is necessary to fit the centerline of the posterior column in the 3D reconstruction model, and due to the particularity of the anatomical structure of the hip bone, the existence of the anterior column in the complete hip bone model will affect the The precise generation of the centerline makes a big difference;

[0015] 4. If only the least squares straight line of the centerline of the posterior column is used to determine the direction of the posterior column screw channel of the hip bone, even if a bone screw with a smaller diameter is used, the guide channel of the aimer may interfere with the iliac wing , resulting in the consequences that the structural size of the sight cannot be designed

[0016] 5. When planning the nailing channel, in addition to mastering the medical imaging software and reverse engineering modeling software commonly used in the medical field, it is also necessary to be proficient in using scientific computing software. Therefore, this method has high requirements for planners, and the operation steps are tedious and the planning cycle longer

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