US 12,127,765 B2
Bottom loading polyaxial screw
Forrest Samuel, Carlsbad, CA (US); and Gregory Palagi, Geneva, IL (US)
Assigned to Life Spine, Inc., Huntley, IL (US)
Filed by Life Spine, Inc., Huntley, IL (US)
Filed on Jan. 15, 2021, as Appl. No. 17/150,865.
Application 17/150,865 is a continuation in part of application No. 16/790,098, filed on Feb. 13, 2020, granted, now 11,350,968.
Application 16/790,098 is a continuation of application No. 15/947,848, filed on Apr. 8, 2018, granted, now 10,588,666.
Claims priority of provisional application 62/483,590, filed on Apr. 10, 2017.
Prior Publication US 2021/0128201 A1, May 6, 2021
Int. Cl. A61B 17/70 (2006.01); A61B 17/86 (2006.01); A61B 90/00 (2016.01)
CPC A61B 17/7032 (2013.01) [A61B 17/7037 (2013.01); A61B 17/8605 (2013.01); A61B 17/863 (2013.01); A61B 2090/037 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A modular bone screw assembly for holding a spine rod in a fixed spatial orientation relative to vertebral bone, the modular bone screw assembly comprising:
a bone screw having a threaded shank and a screw head;
a tulip head disposed on the screw head and configured to move relative to the screw head before the tulip head is fixed in spatial orientation relative to the bone screw, and configured to receive and hold the spine rod as the spatial orientation of the tulip head is fixed, the tulip head having a bore extending from a first end of the tulip head to a second end of the tulip head and having an upper portion, inner threading for threaded receipt of a set screw, a lower portion sized to receive the screw head, and one or more protruding members extending from an inner surface of the bore;
a collet disposed within the bore of the tulip head, the collet having a lower section of a first diameter with a first end configured to rest upon a top portion of the screw head, the collet having one or more engagement members disposed along an exterior portion of the collet; and
an elastically deforming c-clip configured for coupling to the bone screw, wherein the c-clip is retained within a lower portion of the tulip head;
wherein the one or more engagement members of the collet are configured to engage with the corresponding one or more protruding members extending from the inner surface of the bore.