Spinal pedicle screw with locking ridge

By creating a slanted through-hole at the proximal end of the pedicle screw and using the triangular support of the cortical bone screw, the problem of pedicle screw loosening after surgery was solved, achieving stable fixation in patients with osteoporosis, simplifying the surgical procedure, and reducing the risk of revision surgery.

CN122350845APending Publication Date: 2026-07-10马国豪
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
马国豪
Filing Date
2026-04-27
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Postoperative loosening and retraction of pedicle screws are common in osteoporosis patients, making revision surgery difficult and risky, and lacking effective solutions.

Method used

The design incorporates locking pedicle screws for the spine. By creating oblique through-holes at the proximal end of the pedicle screw, the cortical bone screw forms a triangular support with the upper and lower cortical bones of the pedicle. A specialized guide aiming device and drill bit technology are used to ensure that the cortical bone screw is fixed within the oblique hole, avoiding the nerve root pathway and improving fixation strength.

Benefits of technology

It effectively prevents screw loosening, significantly improves resistance to pull-out, rotation and cutting, simplifies the surgical procedure, is suitable for elderly patients with osteoporosis, and reduces the risk of revision surgery.

✦ Generated by Eureka AI based on patent content.

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    Figure CN122350845A_ABST
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Abstract

This invention pertains to spinal pedicle screws, specifically locking spinal pedicle screws, including perforated pedicle screws and cortical bone screws that work with them. The proximal end of the self-locking master screw is thickened. A through-hole is provided in the thickened section of the pedicle screw, and the cortical bone screw is driven into the through-hole and fixed to the upper and lower cortical bone layers of the pedicle to form a triangular fixation. After the pedicle screw is implanted, both ends of the through-hole of the pedicle screw are located inside the pedicle. A hole is drilled from the posterolateral aspect of the pedicle using a special aiming device, passing forward and upward through the oblique hole of the pedicle screw, and then through the anterior and superior cortical bone of the pedicle. After measuring the length, a suitable cortical bone screw is selected, screwed in, and locked, fixing the posterolateral cortical bone, the pedicle screw, and the anterior and superior cortical bone of the pedicle. The screw is positioned in a safe area of ​​the superior cortical bone of the pedicle. The cortical bone screw is fixed to the upper and lower cortical bone of the pedicle by passing through the oblique hole, thus locking the position of the pedicle screw.
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