Posterior reset internal fixation system

Abstract

The invention discloses a posterior reduction internal fixation system. The posterior reduction internal fixation system comprises two vertebral body orthopedic rods arranged in parallel and an adjusting device. During operation, the connecting rods of the two vertebral body orthopedic rods are connected with a vertebral body, and an occipital bone plate is connected with an occipital bone, so that the posterior reduction internal fixation system is connected with the occipital bone and the vertebral body; the base assembly is connected with a pedicle screw close to an occipital bone, and theconnecting assembly is connected with an occipital bone screw; the inclination angle between the occipital bone plate and the connecting rod is adjusted, specifically, the connecting rod is driven bythe first linear driving assembly to move, the first drag hook and the second drag hook are connected with two occipital bone screws on the occipital bone correspondingly, and the first linear drivingassembly is driven by the second linear driving assembly to move; the first linear driving assembly drives the connecting rod and the first drag hook and the second drag hook on the connecting rod tomove, the occipital bone is lifted and dragged, the inclination angle between the occipital bone plate and the connecting rod is made to conform to the anatomical structure of the occipital bone andthe cervical vertebra of the human body, and posterior reduction internal fixation is achieved.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a posterior reduction internal fixation system. Background technique [0002] Basilar invagination is a congenital deformity of the craniocervical junction. The clinical manifestation is that the skull base bone around the foramen magnum sinks upward into the cranial cavity, forcing the lower atlantoaxial vertebrae (odontoid process) to rise into the cranial cavity. At the bottom, it can be combined with other bone developmental abnormalities at the site, and can be combined with neurostructural abnormalities. [0003] Patients are often accompanied by an increase in the anterior spacing of the atlas, and the tip of the odontoid process exceeds the line connecting the posterior edge of the hard palate and the posterior upper edge of the foramen magnum, resulting in a relatively narrow anteroposterior diameter of the foramen magnum, compression of the medulla oblongata and...

AI Technical Summary

Problems solved by technology

[0004] In clinical practice, posterior expansion and decompression of the foramen magnum combined with in situ occipitocervical fusion and internal fixation are often used, or, anterior resection of the odontoid process or atlantoaxial mass joint release and reduction, combined with posterior fixation and occipitocervical fusion To achieve the reduction of the occipital bone and atlantoaxial vertebrae, but the trauma of the above-mentioned techniques is large and the risk is high

[0005] At present, some scholars use simple posterior approach to loosen, reduce and fix the lateral mass of the atlantoaxial vertebrae to achieve atlantoaxial reduction and correct the deformity. This technique has less trauma and relatively lower risk, but there is no convenient and effective posterior reduction and internal fixation system.

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