Detachable pedicle screw

Abstract

The invention discloses a detachable pedicle screw. A screw body and a screw tail adopt a split type structure, micro holes are evenly formed in the screw body and the front end of the screw tail, and the axes of the micro holes are perpendicular to that of the screw body. The pedicle screw adopts the split type structure, namely, a spinning structure, a clamping structure, an insertion structure and the like, the screw body and the screw tail are made of magnesium alloys having advantages of degradability, biocompatibility and the like, meanwhile, the micro holes perpendicular to the axis of the screw body are formed in the screw body and the front end of the screw tail, so that bone trabeculae can be distributed along the micro holes, synchronous reconstruction of the bone trabeculae is allowed during fracture healing, the continuity of the bone trabeculae in vertebrae is recovered, dual healing of fracture cortex and spongiosa is realized, the structure and mechanical conduction features are effectively recovered, the internal fixation complication incidence can be significantly reduced, the fracture treatment effect can be improved, peripheral soft tissue and blood circulation can be effectively protected, the internal fixator related complication occurrence risk is reduced, and pain and economic burden caused by secondary major surgery on patients are avoided.

Description

technical field [0001] The present invention relates to pedicle screws. Background technique [0002] The pedicle is the strongest part of the spine and is the effective point of action for manipulating and immobilizing the spine during vertebral fracture surgery. Pedicle instruments can maintain the normal anatomy of the spine while obtaining effective fixation, and preserve the motion segments of the spine to the greatest extent. At different levels of the same instrument, retraction, compression, rotation, restoration of lordosis, and anterior and posterior translation of the vertebral body can be performed, respectively. It is effective in controlling abnormal activities in all directions, including rotational activities, and because the pedicle instrument has a good stabilizing effect on the three columns and its own versatility, it is also very reliable in maintaining and rebuilding the physiological lordosis of the lumbar spine . There are important bone trabecular...

AI Technical Summary

Problems solved by technology

However, the implantation of internal fixation after fracture will further damage the trabecular bone structure. The existence of internal fixation will hinder the reconstruction of trabecular bone during the fracture healing process, and cannot effectively restore the local normal structure and mechanical conductivity of the bone, which may lead to local stress concentration. , leading to complications such as internal fixation loosening, withdrawal, fracture, fracture nonunion, and fracture around the internal fixation

At the same time, after the fracture heals, a second operation is required to remove the internal fixation, which not only increases the pain of the patient, but also increases the financial burden of the patient.

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