一种大偏角大直径椎弓根钉

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By optimizing the design of the clasp and nail seat structure of the pedicle screw, a stable connection and large-angle swing of the large-diameter screw were achieved, solving the problems of clasp dislodgement and assembly difficulties in the existing technology, and improving the success rate and flexibility of the operation.

CN224505543UActive Publication Date: 2026-07-17CHANGZHOU GEASURE MEDICAL DEVICES CO LTD

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: CHANGZHOU GEASURE MEDICAL DEVICES CO LTD
Filing Date: 2025-02-07
Publication Date: 2026-07-17

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Abstract

本实用新型涉及椎弓根钉的技术领域，尤其涉及一种大偏角大直径椎弓根钉装配方式；通过包括钉、卡环、钉座；所述钉的钉头部上方为外六角，所述钉头部上方的外六角下均布设置有三个斜面三瓣结构所述斜面三瓣结构正下方均布设置有三个凸台结构；所述斜面三瓣结构及所述凸台结构中间位置设置有圆弧槽；所述卡环内部设置有带角度三瓣结构与所述斜面三瓣结构完全贴合；所述卡环内部还设置有无角度三瓣状结构的结构，达到椎弓根钉卡环为闭口环且为上装式无脱出风险、还可以避免低切迹钉座尺寸的限制，能够装入大直径钉并获得更大的摆动角度的效果。

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Claims

1. A large-angle, large-diameter pedicle screw, characterized in that: Includes nail (1), retaining ring (2), nail base (3); The head of the nail (1) has an external hexagon at the top, and three beveled three-lobed structures (4) are evenly distributed below the external hexagon at the top of the nail head. Three protrusion structures (5) are evenly distributed below the inclined three-lobed structure (4). The inclined three-lobed structure (4) and the boss structure (5) are provided with an arc groove (6) in the middle position to accommodate the retaining ring; The retaining ring (2) has an angled three-lobed structure (2-2) inside, which is completely fitted with the inclined three-lobed structure (4); The retaining ring (2) also has a three-lobed structure (2-1) without angle inside.

2. The large-angled, large-diameter pedicle screw of claim 1, wherein, The maximum outer diameter of the inclined three-lobed structure (4) is slightly smaller than the outer diameter of the non-angled three-lobed structure (2-1) of the retaining ring (2), so that it can pass through the non-angled three-lobed structure of the retaining ring.

3. The large-angled, large-diameter pedicle screw of claim 1, wherein, The maximum outer diameter of the boss structure (5) is slightly larger than the minimum circle diameter of the angled three-lobed structure (2-2) of the retaining ring (2).

4. The large-angled, large-diameter pedicle screw of claim 1, wherein, The retaining ring (2) is hemispherical in shape.

5. The large-angled, large-diameter pedicle screw of claim 1, wherein, The bottom end of the nail seat (3) is provided with a spherical groove, which swings in conjunction with the surface of the card ring.

6. The large-angled, large-diameter pedicle screw of Claim 5, wherein, A circular hole is provided above the spherical groove.

7. The large-angled, large-diameter pedicle screw of Claim 6, wherein, The circular hole on the same side of the top U-shaped groove of the nail seat (3) intersects with the spherical groove and has an arc surface (3-1).