Self-adaptive pedicle screw

Abstract

The invention discloses a self-adaptive pedicle screw. A fixing seat internally provided with a spherical through hole is arranged at the top of a screw rod and in slide fit with a spherical hinge which is arranged in the spherical through hole. By means of the spherical hinge structural design, the hole in slide fit is enabled to self adapt to the bending direction of an orthopedic rod so as to offset manufacturing errors of the orthopedic rod, and rod penetration in orthopedics can be easier; further, internal stress generated by elastic deformation of an orthopedic plate due to the fact that the orthopedic rod which is inaccurately manufactured is forcibly pulled into a U-shaped groove of a traditional pedicle screw can be reduced. The self-adaptive pedicle screw has the advantages that incisures at the tail of the screw can be greatly reduced while selection of large-diameter orthopedic rods is completely satisfied; the problem that an existing U-shaped pedicle screw for spinal column orthopedics for infants and children is prone to piercing skin is solved, and the problem that small-diameter orthopedic rods are extremely prone to breakage is solved as well; slide between the nail and the rod is allowed to induce an abnormal spinal column to growth towards the normal direction, limits on growth of the spinal column are avoided, and threats on spinal functions due to surgery prolonging and spinal stretching are avoided.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to an adaptive pedicle screw with simple structure and easy operation. Background technique [0002] Spinal deformity refers to the deviation of one or several segments of the spine from the midline of the spine, usually accompanied by rotation of the vertebral bodies and increased or decreased kyphosis or protrusion on the sagittal plane. It is a three-dimensional spinal deformity with an incidence of about 0.5-2% in adolescents and can be caused by various diseases. When the angle of scoliosis is too large, or shows a clear trend of progress, surgical treatment needs to be considered; otherwise, it will gradually develop into a severe and rigid spinal deformity, which will seriously affect the heart and respiratory function of the child, and affect the spinal cord function leading to paralysis. Even life-threatening. The main purpose of surgical treatment is ...

AI Technical Summary

Problems solved by technology

In order to reduce the notch at the tail of the screw, the existing systems mostly use thin orthopedic rods; the method of fixing the orthopedic rod on the pedicle screw is to compress the orthopedic rod with a nut, which is a rigid connection. Will bring greater internal stress and mechanical damage to the orthopedic rod

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