US 11,849,978 B2
Constrained motion bone screw assembly
Nam T. Chao, Marlborough, MA (US); Simon Siu, Quincy, MA (US); Ronald Sacher, Boca Raton, FL (US); Jerold P. Gurley, Middleburg Heights, OH (US); Randal Betz, Ocean City, NJ (US); and Peter O. Newton, San Anselmo, CA (US)
Assigned to Medos International Sarl, Le Locle (CH)
Filed by Medos International Sarl, Le Locle (CH)
Filed on Apr. 16, 2021, as Appl. No. 17/232,836.
Application 17/232,836 is a continuation of application No. 16/217,329, filed on Dec. 12, 2018, granted, now 11,000,315.
Application 16/217,329 is a continuation of application No. 15/711,380, filed on Sep. 21, 2017, granted, now 10,172,648, issued on Jan. 8, 2019.
Application 15/711,380 is a continuation of application No. 14/754,259, filed on Jun. 29, 2015, granted, now 9,795,416, issued on Oct. 24, 2017.
Application 14/754,259 is a continuation of application No. 11/073,325, filed on Mar. 4, 2005, granted, now 7,951,172, issued on May 31, 2011.
Prior Publication US 2021/0282818 A1, Sep. 16, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 17/70 (2006.01)
CPC A61B 17/7037 (2013.01) [A61B 17/704 (2013.01); A61B 17/7038 (2013.01); A61B 17/7041 (2013.01); A61B 17/7032 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A spinal system, comprising:
at least a first bone anchor having a proximal head and a distal shaft configured to engage bone, the proximal head having a spherical shape with opposed first and second non-spherical side portions;
at least a first receiving member being configured to receive the first bone anchor and having a proximal end and a distal end, the proximal end of the first receiving member having two spaced apart upright arms defining a recess for receiving a spinal rod therebetween, the distal end of the at least a first receiving member having a bore therethrough; and
at least a first cap being configured to be seated within the first receiving member and having a proximal portion configured to seat the spinal rod, the at least a first cap configured to extend around opposed sides of the spinal rod and above a center thereof, the at least a first cap having a cavity formed in a distal portion thereof configured to at least partially receive the proximal head of the first bone anchor,
first and second restrictor elements each having a first end configured to be removably attached to the at least a first cap and a second end that extends distally beyond the at least a first cap, and that are complementary to and configured to receive the first and second non-spherical side portions of the at least a first bone anchor;
wherein when the first bone anchor is received in the cavity of the at least a first cap, the first and second restrictor elements engage with at least a portion of the first and second non-spherical side portions of the proximal head to restrict movement of the first bone anchor relative to the at least a first cap in a direction toward and away from the side portions of the at least a first cap.