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US 9,956,018 B2Granted
Bone screw
AssigneeAesculap AG
InventorsAndrea Peukert, Sven Krüger, Michael Rauschmann, Bronek Boszczyk
Life of this patent
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Abstract
A bone screw includes a screw shaft with an external thread. The screw shaft anchors the bone screw in a bone. A proximal end of the screw shaft includes a screw head. The ratio between the outer thread diameter and the thread core diameter increases toward the screw head in a proximal screw shaft portion or in the area of the thread's run-out.
Claims6
A bone screw comprising:
- a screw shaft provided with an external thread and serving for anchoring the bone screw in a bone, the screw shaft comprising an outer thread diameter and a thread core diameter;
- and
- a screw head provided on a proximal end of the screw shaft,
- wherein, in a proximal screw shaft portion, a ratio between the outer thread diameter and the thread core diameter increases toward the screw head in an area of the external thread's run-out;
- and
- wherein, in a transition screw shaft portion directly adjacent to the proximal screw shaft portion, the ratio between the outer thread diameter and the thread core diameter decreases toward the screw head, said ratio between the outer thread diameter and the thread core diameter decreasing all the way to where the transition screw shaft portion intersects the proximal screw shaft portion.
3 more elements
Dependencies are inferred from the claim text.