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US 2019/0239935 A1Published application
Orthopedic Screw and Porous Structures Thereof
AssigneeStryker European Holdings I, LLC
InventorsSteven Willis, Steven F. Krause, Amir Ali Sharifi-Mehr, Brett Traficant, Erika Corbin, Lauren Barkauskas
Life of this patent
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Abstract
A bone fastener includes a head, and a screw portion extends from the head. The screw portion includes a shaft and a thread extending along and about the shaft. The thread has a height extending from a root to a tip thereof. The thread also has first and second portions disposed between the root and the tip. The second portion has a porous structure configured to promote bone ingrowth and has a porosity greater than that of the first portion.
Claims20
A bone fastener comprising:
- a head;
- and
- a screw portion extending from the head, the screw portion having a shaft and a thread extending along and about the shaft, the thread having a height extending from a root to a tip thereof, the thread also having first and second portions disposed between the root and the tip, the second portion having a porous structure configured to promote bone ingrowth and having a porosity greater than that of the first portion.
A bone fastener comprising:
- a head;
- a screw portion extending from the head, the screw portion having a shaft and a thread extending helically along and about the shaft and defining a helical depression therebetween;
- and
- a plurality of porous fenestrations disposed within the helical depression and extending into the shaft, the porous fenestrations being filled with a porous structure configured to promote bone ingrowth, the porous structure comprising a portion of an external surface of the bone fastener and being surrounded by a solid structure having a porosity smaller than that of the porous structure;
- and
- a porous liner at least partially surrounding the channel and being disposed within the shaft of the screw portion, the porous liner having a porous structure interconnected within the porous structure of at least two of the porous fenestrations.
3 more elements
A bone fastener comprising:
- a head;
- first and second screw portions each having a shaft and a thread extending along and about the shaft;
- and
- a shank disposed between the first and second screw portions, the shank being threadless and having a plurality of porous portions interspersed within a solid substrate such that an exterior surface is both solid and porous.
1 more element
Dependencies are inferred from the claim text.