Degradable screw and manufacturing method thereof

Abstract

The invention discloses a degradable screw and a manufacturing method thereof. The screw is composed of two parts, namely an inner part and an outer part, wherein the inner part is a solid cylinder, the outer part is composed of three parts, namely a tail part, a middle part and a head part respectively, the three parts are connected into a whole and are located on the same central axis, the outerpart surrounds the periphery of the inner part, the outer part and the inner part are tightly combined, the surface of the outer part is of a threaded structure, the outer part is of a solid structure, the tail part comprises a hollow cylinder body and a groove located in the end face of the hollow cylinder body, the bottom surface of the groove is flush with the end face of the inner part, the middle part is a hollow cylinder body adjacent to the end face of the tail part, and the head part comprises a circular truncated cone adjacent to the end face of the hollow cylinder body and a hemisphere located on the end face of the circular truncated cone. The screw is made of a bioactive material, and has high mechanical strength and good biological activity. The manufacturing method is convenient to operate and low in manufacturing cost, the diameter of the screw can be changed randomly, and manufacturing of screws with different diameters can be realized.

Description

technical field [0001] The invention relates to the manufacture of interface screws in intra-articular ligament reconstruction, in particular to a degradable screw and a manufacturing method thereof. Background technique [0002] Arthroscopic ligament reconstruction is currently an effective surgical treatment for intra-articular ligament injuries and restoration of joint stability and function. However, the problem of bone-ligament interface healing still plagues the majority of clinicians. Once the ligament-bone interface is poorly healed, it is likely to lead to the failure of the entire operation. [0003] At present, the commonly used method of ligament fixation in clinic is fixation with absorbable interface screws through the marrow canal, and the interface screws are composed of poly-L-lactic acid (PLLA). PLLA has good biocompatibility and suitable degradation speed. With the absorption of its own material, the bone tissue fills the entire tunnel synchronously, so t...

AI Technical Summary

Problems solved by technology

Among them, the light-curing molding technology has its unique advantages in high-precision material manufacturing, but the 3D printing technology uses the data of 3D CAD, after layering into 2D slice data, it is manufactured layer by layer through computer control equipment, and a Layers of materials are piled up into a three-dimensional solid, so along the direction of material stacking, there will be obvious step patterns on the surface layer, and the bonding performance between layers is poor, which leads to unsatisfactory bending resistance of the solid structure

Images