US 12,232,776 B2
Anchoring member for a polyaxial bone anchoring device and polyaxial bone anchoring device with such an anchoring member
Timo Biedermann, Trossingen (DE); and Achim Schunemann, VS-Mühlhausen (DE)
Assigned to BIEDERMANN TECHNOLOGIES GMBH & CO. KG, Donaueschingen (DE)
Filed by BIEDERMANN TECHNOLOGIES GMBH & CO. KG, Donaueschingen (DE)
Filed on Feb. 7, 2022, as Appl. No. 17/665,837.
Application 17/665,837 is a continuation of application No. 16/686,714, filed on Nov. 18, 2019, granted, now 11,284,922.
Claims priority of provisional application 62/769,854, filed on Nov. 20, 2018.
Claims priority of application No. 18207354 (EP), filed on Nov. 20, 2018.
Prior Publication US 2022/0226025 A1, Jul. 21, 2022
Int. Cl. A61B 17/70 (2006.01); A61B 17/86 (2006.01); A61B 17/00 (2006.01)
CPC A61B 17/7037 (2013.01) [A61B 17/7032 (2013.01); A61B 17/8685 (2013.01); A61B 2017/00867 (2013.01); A61B 17/7059 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An anchoring member for a polyaxial bone anchoring device, the anchoring member comprising:
a bone anchoring section having a first end, a second end, and a bone engagement surface on at least a portion thereof;
a head having an outer surface portion that defines a segment of a sphere, wherein a central axis extends through respective centers of the head and the first and second ends of the bone anchoring section, wherein the segment of the sphere of the head has a free end with a first width measured in a direction perpendicular to the central axis and an opposite end that is closer to the bone anchoring section with a width measured in the direction perpendicular to the central axis that is greater than the first width; and
a neck extending between the first end of the bone anchoring section and the head, the neck comprising:
a first portion having at least a region that is closer to the head than to the bone anchoring section, wherein in at least a first cross-sectional plane including the central axis, the first portion is concave with a first curvature; and
a second portion extending between the first portion and the bone anchoring section, wherein in at least the first cross-sectional plane, the second portion is concave with a second curvature that is less curved than the first curvature.