Multifunctional universal intervertebral distraction apparatus used for posterior lumbar interbody fusion technology

Abstract

The invention discloses a multifunctional universal intervertebral distraction apparatus used for the posterior lumbar interbody fusion technology. The distraction apparatus comprises a first distraction arm, a second distraction arm and a distraction rack, and the second distraction arm is installed on the distraction rack through a slider and slides along the distraction rack along with the slider; the first distraction arm and the second distraction arm are both of a multi-section type structure, and each distraction arm comprises a rear distraction arm section, a middle distraction arm section, a front distraction arm section and a clamping section which are connected in sequence; each middle distraction arm section is divided into two segments, the close segment and the far segment of each middle distraction arm section are rotationally connected, and the rotational angle is locked through a locking mechanism. The clamping sections of the two distraction arms are placed in U-shaped grooves in the tail portions of adjacent pedicle screws, one of the distraction arms slides along the distraction rack, the intervertebral space is effectively distracted, and the implantation safety of an interbody fusion cage is improved. A pull hook is arranged between the two distraction arms, the erector spinae can be pulled to the outer side through the pull hook, the operation field is sufficiently exposed, and the operation convenience and safety are improved.

Description

technical field [0001] The invention belongs to the field of medical machinery, in particular to an intervertebral spacer used in posterior lumbar intervertebral fusion. Background technique [0002] The incidence of degenerative thoracolumbar diseases such as disc herniation and spinal stenosis is increasing. PLIF and TLIF surgery are the main surgical methods for the treatment of these thoracolumbar degenerative diseases. The specific method is that after the pedicle screw is implanted during the operation, the intervertebral space is opened by mold testing, cutting, bending, and loading. After the rod is fixed, because the connecting rod is above the intervertebral space, when the intervertebral fusion device is implanted, the position of the rod leads to insufficient operating space when the fusion device is implanted, which greatly hinders the implantation of the intervertebral fusion device and increases The risk of accidental nerve injury is reduced, especially for t...

AI Technical Summary

Problems solved by technology

After the rod is fixed, because the connecting rod is above the intervertebral space, when the intervertebral fusion device is implanted, the position of the rod leads to insufficient operating space when the fusion device is implanted, which greatly hinders the implantation of the intervertebral fusion device and increases The risk of accidental nerve injury is reduced, especially for the implantation of the kidney-shaped fusion device.

If the rods are not installed in advance to expand, the intervertebral space cannot be effectively expanded, resulting in a smaller fusion cage, the height of the intervertebral space cannot be effectively restored, and the postoperative symptoms are not relieved satisfactorily.

In addition, due to the well-developed erector spinae muscles in the lower back, the blocking effect of the muscles is too large when the intervertebral fusion cage is implanted, which affects the operation. input operation

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