US 11,839,411 B2
Bone anchor assemblies and related instrumentation
Eric Biester, Barrington, RI (US); Michael Sorrenti, Middleboro, MA (US); and Ellen Wasserbauer, Mendon, MA (US)
Assigned to Medos International Sarl, Le Locle (CH)
Filed by Medos International Sarl, Le Locle (CH)
Filed on Dec. 8, 2020, as Appl. No. 17/115,761.
Application 17/115,761 is a continuation of application No. 16/183,720, filed on Nov. 7, 2018, granted, now 10,874,438, issued on Dec. 29, 2020.
Application 16/183,720 is a continuation in part of application No. 15/623,444, filed on Jun. 15, 2017, granted, now 10,568,667, issued on Feb. 25, 2020.
Application 15/623,444 is a continuation in part of application No. 15/208,872, filed on Jul. 13, 2016, granted, now 10,463,402, issued on Nov. 5, 2019.
Application 15/208,872 is a continuation in part of application No. 15/208,847, filed on Jul. 13, 2016, granted, now 10,363,073, issued on Jul. 30, 2019.
Prior Publication US 2021/0113246 A1, Apr. 22, 2021
Int. Cl. A61B 17/70 (2006.01); A61B 17/86 (2006.01); A61B 90/00 (2016.01)
CPC A61B 17/7037 (2013.01) [A61B 17/7001 (2013.01); A61B 17/7007 (2013.01); A61B 17/708 (2013.01); A61B 17/7032 (2013.01); A61B 17/7082 (2013.01); A61B 17/7083 (2013.01); A61B 17/863 (2013.01); A61B 17/8615 (2013.01); A61B 17/8625 (2013.01); A61B 17/7041 (2013.01); A61B 17/7076 (2013.01); A61B 17/864 (2013.01); A61B 2090/031 (2016.02); A61B 2090/037 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A bone anchor assembly, comprising:
a receiver member having proximal and distal ends that define a central proximal-distal axis, the receiver member having a cavity formed therein, the cavity being open to the distal end of the receiver member;
a shank having a head portion configured to be disposed in the cavity by passing through the open distal end of the receiver member;
a compression cap disposed in the cavity and configured to contact the head portion of the shank; and
an insert attached to the receiver member to retain the head portion of the shank within the receiver member;
wherein the insert is prevented from moving proximally or distally relative to the receiver member by an annular ridge of the insert received within a groove formed in the receiver member;
wherein the insert is monolithic;
wherein the insert defines an outer surface that extends distally from the annular ridge and forms a radially inward step distal to the annular ridge; and
wherein a distal portion of an inner sidewall of the cavity extends distally from the groove along at least a portion of the outer surface of the insert, the distal portion preventing radially outward movement of the insert.