Medical anchor type vertebral pedicle screw

Abstract

The invention discloses a medical anchor type vertebral pedicle screw which is mainly used for the spine surgery of an osteoporosis patient. The vertebral pedicle screw comprises a vertebral pedicle screw body with outer threads, wherein the vertebral pedicle body is provided with two symmetrical J-shaped hole passages which are respectively communicated with the outside by a hole between the screw pitch of the outer threads, the position of the hole of one J-shaped hole passage at the screw pitch of the vertebral pedicle screw is half of the screw pitch higher than the position of the hole of the other hole passage, two fixing pins which are inserted in the two hole passages and the vertebral pedicle body form an anchor type structure. An anchoring method is used for changing the contact mode between the cancellous bone screw and a centrum, so that the anti-pullout-force strength of the vertebral pedicle screw can be effectively improved.

Description

technical field [0001] The invention belongs to medical appliances, and relates to a novel medical anchor type pedicle screw, which can effectively improve the stability and reliability of the pedicle spinal internal fixation device. Background technique [0002] Since Boucher successfully fixed the lumbosacral joint through the lamina and pedicle in 1959, the internal fixation of the spine through the pedicle has been widely used in the treatment of degenerative spinal diseases and trauma all over the world. , spinal tumors, spinal deformities and other spinal disorders, and achieved a relatively satisfactory effect. At present, transpedicular internal fixation is a commonly used surgical method for spinal fixation through the posterior approach. The current international pedicle screw is a solid structure with a conical inner diameter and a cylindrical outer view, with a diameter of 4.5-8.5mm. The pull-out strength of this kind of screw depends on the contact area betwee...

AI Technical Summary

Problems solved by technology

The pull-out strength of this kind of screw depends on the contact area between the thread and the bone and the strength of the vertebral body itself. Usually, the pull-out strength is small, which is not enough to resist the strong pulling force required for vertebral body reduction, fixation, and post-fixation. Continuous tension often leads to vertebral body reduction, fixation failure or failure to achieve good anatomical reduction, thus losing the meaning of surgery

Especially when the patient has osteoporosis, improper postoperative activities, and insufficient pull-out resistance of living pedicle screws, the screws often loosen or even come out, resulting in surgical failure

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