Atlas posterior plate-stick type fixator

Abstract

The invention relates to a plate and rod type fixer of the posterior of atlas, which is used for bone fracture of the atlas and consists of a plate and rod type fixed plate (1), universal atlas pedicle screws (2) and connecting screws (3). The plate and rod type fixed plate (1) are divided into two parts of a fixed plate (11) and a fixed rod (12); the fixed plate (11) is wide at the middle and thin at the two ends; the surface of the plate is arch-bent in a shape of the arcus posterior atlantis and is provided with screw holes (13); the connecting screws (3) are screwed into the arcus posterior atlantis by the screw holes so as to fix the fixed plate; the two ends of the fixed plate (11) are connected with the fixed rod (12) which takes the shape of a short rod; the universal atlas pedicle screws (2) consists of screw caps (21), nuts (22) and screws (23); the screw caps are provided with U-shaped slots (211); and the universal atlas pedicle screws are hung on the fixed rod (12) by the U-shaped slots and are fixed on the fixed rod by the nuts. The invention has good safety and fixing effect, is applicable to bone fracture of posterior arch and / or anterior arch and / or massa lateralis of the atlas and completely remain the motility of the occipitocervical part.

Description

technical field [0001] The invention relates to the technical field of medical devices, and relates to an atlas posterior plate-rod fixer for atlas fractures. Background technique [0002] Atlas fractures are not uncommon in clinical practice. Because the medulla oblongata contained by the atlas is the center of life, fractures at this site have always been the most dangerous injuries in orthopedics, especially cervical surgery. The treatment of atlas fractures has the characteristics of high risk, high difficulty and great challenge. At present, due to the lack of accurate and reliable internal fixation methods for atlas fractures, most of them choose conservative treatment. The disadvantage of conservative treatment is that the treatment cycle is long, and long-term external fixation often makes it difficult for patients to tolerate it, which seriously affects the time for patients to return to work and their quality of life. Moreover, for unstable atlas fractures, conse...

AI Technical Summary

Problems solved by technology

But at present this kind of atlas fixation is not ideal: first, someone designs a kind of atlas anterior arch fracture fixation, during operation, the anterior arch fixation plate is inserted through the oral cavity through the oropharynx, and then screws are used to fix the atlas anterior arch fracture , although this technology completely retains the range of motion of the occipital neck, the transoropharyngeal surgery has defects such as complicated approach, difficulty in revealing the fracture, high technical requirements, high infection rate, and difficulty in eating in the early postoperative period. It is difficult to carry out widely, and since more than 50% of atlas fractures are posterior arch fractures, and the main indication of this technique is anterior arch fracture of atlas, it cannot solve most atlas fracture fixation problems

Second, in order to overcome the disadvantages of anterior surgery and reduce the difficulty of surgery, someone designed a plate fixation system for the posterior arch of the atlas. However, because the shape of the posterior arch of the atlas is wide in the middle and gradually becomes thinner towards both ends, the steel plate can only be placed in the wide middle part, and the length of the steel plate is limited.

In addition, due to the atlas posterior arch screw fixation, the system is limited by the anatomy of the atlas posterior arch, and only short screws can be screwed in. The fixation strength is limited, and it must be used in combination with axial laminar screws to achieve sufficient stability. Therefore, it is actually a fusion surgery that sacrifices the mobility of the atlantoaxial spine, and the fixation system is also helpless for the lateral mass fractures and anterior arch fractures in the atlas fractures

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