Polyaxial bone anchoring device with enlarged pivot angle

Inventors: Lutz Biedermann (VS-Villingen, DE); Wilfried Matthis (Weisweil, DE)

Assignee: BIEDERMANN TECHNOLOGIES GMBH & CO. KG

A61B17/7037 A61B17/7032 A61B17/7035 A61B17/7038 A61B17/8605

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Quick Facts

Patent No.: US 12697146
App. No.: 18/798,300
Granted: Aug 4, 2026
Kind: B2

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Abstract

A bone anchoring device includes a bone anchoring element with a spherical segment-shaped head, a receiving part configured to couple a rod to the bone anchoring element, and having a top end, a bottom end, a first passage at the bottom end with a first longitudinal axis, and a second passage at the top end with a second longitudinal axis that intersects the first longitudinal axis, a compression element, and a locking element. The receiving part also has a recess for the rod, the recess extending from the top end towards the bottom end and having a bottom that extends along an axis that is perpendicular to the second longitudinal axis. The receiving part or the compression element further has a seat. The compression element is configured to move along the first longitudinal axis while the locking element is configured to move along the second longitudinal axis.

Claims (29)

1 . A polyaxial bone anchoring device comprising:

a monolithic receiving part for coupling a rod to a bone anchoring element, the receiving part comprising a top end, a bottom end, a longitudinal axis that extends from the top end towards the bottom end, two arms defining a channel that is open to the top end and that extends perpendicularly to the longitudinal axis for receiving the rod, and an opening at the bottom end for accommodating the bone anchoring element, wherein a portion of the opening oriented in a first radial direction relative to the longitudinal axis extends closer axially to the top end of the receiving part than another portion of the opening is to the top end; and

a separate flexible seat portion comprising an at least partially upwardly facing surface configured to engage and hold a head of the bone anchoring element in the receiving part.

2 . The polyaxial bone anchoring device of claim 1 , wherein the seat portion is formed as part of a compression member that configured to extend into the channel to engage the rod.

3 . The polyaxial bone anchoring device of claim 1 , wherein the seat portion is movable at least partially axially in the receiving part.

4 . The polyaxial bone anchoring device of claim 1 , wherein the head is insertable through the opening at the bottom end of the receiving part into the receiving part.

5 . The polyaxial bone anchoring device of claim 4 , wherein the opening at the bottom end of the receiving part has a diameter that is greater than a greatest diameter of the head of the bone anchoring element to facilitate insertion of the head through the opening into the receiving part.

6 . The polyaxial bone anchoring device of claim 1 , wherein the seat portion is restricted from moving in a direction parallel to the longitudinal axis in the receiving part.

7 . The polyaxial bone anchoring device of claim 1 , wherein the seat portion is configured to surround a majority of a circumference of the head to hold the head in the receiving part.

8 . The polyaxial bone anchoring device of claim 1 , wherein a lower region of the receiving part extends circumferentially around a central axis that is oriented at a first angle oblique to the longitudinal axis.

9 . A polyaxial bone anchoring device comprising:

a bone anchoring element comprising a head and a shank;

a monolithic receiving part for coupling a rod to the bone anchoring element, the receiving part comprising a top end, a bottom end, a longitudinal axis that extends from the top end towards the bottom end, two arms that extend substantially parallel to the longitudinal axis and that define a channel open to the top end for receiving the rod, an opening at the bottom end through which the longitudinal axis extends for accommodating the bone anchoring element, and a laterally extending recess formed in an inner wall of the receiving part, wherein a portion of the opening oriented in a first radial direction relative to the longitudinal axis extends closer axially to the top end of the receiving part than another portion of the opening is to the top end; and

a separate seat portion configured to extend into the recess of the receiving part;

wherein the head is insertable through the opening at the bottom end into the receiving part, and wherein the seat portion comprises an at least partially upwardly facing surface configured to engage and hold the head in the receiving part.

10 . The polyaxial bone anchoring device of claim 9 , wherein the recess is formed in the inner wall of the receiving part at least in the first radial direction.

11 . The polyaxial bone anchoring device of claim 9 , wherein the recess extends entirely circumferentially around the inner wall of the receiving part.

12 . The polyaxial bone anchoring device of claim 9 , wherein the recess is spaced apart from the portion of the opening oriented in the first radial direction.

13 . The polyaxial bone anchoring device of claim 9 , wherein the head is insertable through the opening when the seat portion is assembled to the receiving part.

14 . The polyaxial bone anchoring device of claim 9 , wherein the opening at the bottom end of the receiving part has a diameter that is greater than a greatest diameter of the head of the bone anchoring element to facilitate insertion of the head through the opening into the receiving part.

15 . The polyaxial bone anchoring device of claim 9 , wherein the seat portion is configured to surround a majority of a circumference of the head to hold the head in the receiving part.

16 . A polyaxial bone anchoring device comprising:

a bone anchoring element comprising a head and a shank;

a monolithic receiving part for coupling a rod to the bone anchoring element, the receiving part comprising a top end, a bottom end, a longitudinal axis that extends from the top end towards the bottom end, two arms defining a channel that is open to the top end and that extends perpendicularly to the longitudinal axis for receiving the rod, and an opening at the bottom end for accommodating the bone anchoring element, wherein a portion of the opening oriented in a first radial direction relative to the longitudinal axis extends closer axially to the top end of the receiving part than another portion of the opening is to the top end; and

a separate monolithic seat portion configured to engage and exert both axially upwardly and downwardly directed forces on the head in the receiving part.

17 . The polyaxial bone anchoring device of claim 16 , wherein the seat portion is configured to engage an uppermost end of the head in the receiving part.

18 . The polyaxial bone anchoring device of claim 16 , wherein the seat portion is configured to surround a majority of a circumference of the head to hold the head in the receiving part.

19 . The polyaxial bone anchoring device of claim 16 , wherein the head is insertable through the opening at the bottom end of the receiving part into the receiving part.

20 . The polyaxial bone anchoring device of claim 19 , wherein the opening at the bottom end of the receiving part has a diameter that is greater than a greatest diameter of the head of the bone anchoring element to facilitate insertion of the head through the opening into the receiving part.