发明名称 |
Polyaxial pedicle screw with increased angulation |
摘要 |
A polyaxial bone anchor including a housing and a bone screw. A bottom surface of the housing includes an aperture that defines an angulation limit of the bone screw for each azimuthal angle around a longitudinal axis of the housing. The aperture is V-shaped, with the V-shape having converging side walls that define a low-angulation direction near their intersection and a high-angulation direction opposite the low-angulation direction. In some cases, the angulation limit of the bone screw is generally constant over a range of azimuthal angles centered around the high-angulation direction. The housing may be modular, including tabs on one component that are plastically deformed to engage a lip on another component. During assembly, a mandrel advances longitudinally along a bore in the housing, and forces the tabs radially outward toward the lip to a radially outward plastically deformed state. |
申请公布号 |
EP2497435(A2) |
申请公布日期 |
2012.09.12 |
申请号 |
EP20120001589 |
申请日期 |
2012.03.08 |
申请人 |
ZIMMER SPINE, INC. |
发明人 |
HESTAD, HUGH D.;DANT, JACK A.;LUNDEQUAM, ERIC J.;JERKE, ERIC P.;HOCH, DEBORAH L. |
分类号 |
A61B17/70 |
主分类号 |
A61B17/70 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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