US 12,329,422 B2
Pivotal bone anchor assembly with resiliently axially compressible shank head and rod engaging insert
Roger P. Jackson, Prairie Village, KS (US)
Filed by Roger P. Jackson, Prairie Village, KS (US)
Filed on Jul. 18, 2024, as Appl. No. 18/776,707.
Application 18/776,707 is a continuation of application No. 18/359,566, filed on Jul. 26, 2023, granted, now 12,042,185.
Application 18/359,566 is a continuation of application No. 17/033,417, filed on Sep. 25, 2020, granted, now 11,717,328, issued on Aug. 8, 2023.
Application 17/033,417 is a continuation of application No. 13/068,506, filed on May 12, 2011, granted, now 10,792,074, issued on Oct. 6, 2020.
Claims priority of provisional application 61/395,692, filed on May 14, 2010.
Prior Publication US 2024/0366270 A1, Nov. 7, 2024
Int. Cl. A61B 17/70 (2006.01); A61B 17/86 (2006.01)
CPC A61B 17/7037 (2013.01) [A61B 17/702 (2013.01); A61B 17/705 (2013.01); A61B 17/86 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A pivotal bone anchor assembly for securing a longitudinal connecting member to a bone of a patient via a closure, the pivotal bone anchor assembly comprising:
a receiver comprising a base portion defining a lower portion of a central bore centered about a vertical centerline axis and communicating with a bottom surface of the base portion through a bottom opening, and an upper portion defining a channel configured to receive the longitudinal connecting member, the central bore extending upward from the bottom opening through the channel to a top of the upper portion and including a support surface adjacent the bottom opening, a helically wound guide and advancement structure adjacent the top of the upper portion, and an integral non-threaded downward-facing surface below the helically wound guide and advancement structure;
a shank comprising a head portion and an anchor portion opposite the head portion configured for attachment to the bone, the head portion being positionable within the lower portion of the central bore and pivotably supported therein by the support surface with the shank extending downwardly through the bottom opening;
a unitary insert positionable within the central bore of the receiver, the insert comprising a center opening, a downward-facing lower surface configured to engage the head portion of the shank, at least one upward-facing surface located radially outward from the center opening, and at least one slot configured to make the insert resiliently axially compressible when the at least one upward-facing surface of the insert abuts the downward-facing surface of the central bore so as to apply a pre-lock friction fit pressure against the head portion of the shank,
wherein the insert is configured to engage both the head portion of the shank and the longitudinal connecting member when the head portion of the shank, the insert, and the longitudinal connecting member are positioned together in the receiver.