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US 2022/0175431 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.
Claims15
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, comprising:
- a head;
- a screw portion extending from the head and having a shaft and a thread extending helically about and along the shaft and defining a helical depression therebetween;
- and
- a channel extending through the shaft and head,
- wherein the thread is made of a first material, and the shaft is made of the first material and a second material such that the second material forms columns arranged within the helical depression and each being surrounded by the first material and extending from an outer surface of the shaft to the channel, the second material having a porosity greater than that of the first material.
2 more elements
Dependencies are inferred from the claim text.