Bionic low-friction artificial atlanto-tooth joint

Abstract

The invention discloses a bionic low-friction artificial atlanto-odontoid joint which comprises an atlas component, an axis component and a screw, wherein the atlas component comprises a cup-and-ball joint and side wings; the cup-and-ball joint comprises a ball cup and a circular truncated cone-shaped housing arranged at the lower end of the ball cup; the side wings are provided with symmetric lock screw holes; the axis component is divided into an upper part and a lower part; the upper part comprises a polyethylene ball head sleeve and an irregular cylinder platform below the ball head sleeve; the bottom of the cylinder platform is designed into a multi-toothed structure; the lower part is matched with the front structure of an axis body; three locking screw holes formed in a Chinese character 'pin' shape are formed in the lower part; hydroxyapatite coatings are designed at the contact parts of the joints and the bone surface. On the premise of keeping the rotation function of the atlas and axis, the limited lateral bending and flexion and extension functions of the atlas and axis are realized, the design depth of the cup-and-ball joint is large, and the dislocation risk is reduced, so that the atlanto-odontoid joint is closer to the physiological status of a human body, and joints between the atlas component and denticulations are made of metal-on-polyethylene, so that the friction and collision sound is reduced, and the revision possibility is reduced.

Description

technical field [0001] The invention belongs to the technical field of medical prosthesis manufacturing, and in particular relates to a bionic low-friction artificial atlanto-tooth joint retaining three-dimensional motion. Background technique [0002] The upper cervical vertebrae of the human body are the first and second cervical vertebrae, namely the atlantoaxial vertebrae. The structure of the atlantoaxial spine is different from that of the lower cervical spine. There is no intervertebral disc structure. It is composed of three joints and multiple ligaments, namely, the odontoid process of the axis and the posterior articular surface of the anterior arch of the atlas, as well as the median joint composed of the transverse ligament and alar ligament of the atlas. It consists of two approximately horizontal and slightly inclined articular surfaces formed by the inferior articular surface of the atlas and the upper articular surface of the axis on both sides. The atlantod...

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to overcome the shortcomings of the traditional fusion technology, improve the shortcomings of the existing artificial atlanto-tooth joint, and provide a bionic low-friction artificial atlanto-tooth joint. The human atlanto-tooth joint is close, and mechanically can limit the range of motion of the joint, not only retaining the rotation function, but also effectively retaining a small amount of lateral flexion and forward flexion and extension functions between the atlantoaxial vertebrae, which is closer to the physiological state; The impact sound is weak during the process, which reduces the chance of joint revision and postoperative discomfort for patients

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