Rotatable large-angle cervical posterior cardan screw

Abstract

The invention relates to the technical field of medical instruments, in particular to a rotatable large-angle cervical posterior cardan screw. The rotatable large-angle cervical posterior cardan screw comprises a cylindrical cardan screw base and a spherical screw rotationally connected to one end of the cardan screw base; a U-shaped groove is formed in the end, away from the spherical screw, of the cardan screw base in the axis direction of the cardan screw base, and threads cooperating with a screw plug are formed in the inner wall of the end, away from the spherical screw, of the cardan screw base; a spherical screw base with one end inserted into the cardan screw base and rotationally connected with the end part of the cardan screw base is further comprised; a ball socket allowing the spherical screw to be inserted into the spherical screw base from the end, close to the cardan screw base, of the spherical screw base and limiting the head part of the spherical screw at the end, away from the cardan screw base, of the spherical screw base is formed in the axis direction of the spherical screw base; the end, away from the cardan screw base, of the spherical screw base is provided with a first abdicating part for the spherical screw to rotate until the maximum included angle between the axis of the spherical screw and the axis of the cardan screw base is 60 degrees; and a cardan pad is detachably and fixedly connected to the end, close to the cardan screw base, of the spherical screw base. The rotatable large-angle cervical posterior cardan screw can reduce the rod breaking risk during shaping of a connecting rod.

Description

technical field [0001] The present application relates to the technical field of medical devices, in particular to a rotatable large-angle posterior cervical universal nail. Background technique [0002] With the continuous improvement of the design of cervical spine implants and the continuous improvement of bone implant surgery technology, cervical spine surgery uses cervical screw technology to treat cervical spine deformity, slippage, trauma, tumor, axis fracture, occipitocervical dislocation instability, etc. Disease has become very common, and the treatment effect is getting better and better. In the process of posterior cervical surgery, screws need to be implanted in the cervical pedicle or lateral mass, and the angle between the screw and the cervical spine is required to be very large. Therefore, spherical screws are usually used for treatment to reduce the pain caused by the curved rod. Complications. [0003] In the related art, the universal nail includes a un...

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to shape the implanted connecting rod. The molding of the connecting rod will affect the strength of the connecting rod, causing the rod to break. The physiological curve at the time of implantation is not the same, resulting in poor recovery and expected results

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