Multipoint fixation implants and related methods

Patent metadata

Field	Value
Publication number	US-11717327-B2
Application number	US-202017124152-A
Country	US
Kind code	B2
Filing date	Dec 16, 2020
Priority date	Mar 20, 2018
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

Bone anchor assemblies are disclosed herein that can provide for improved fixation as compared with traditional bone anchor assemblies. An exemplary assembly can include a bracket or wing that extends down from the receiver member. The distal portion of the wing can define a bone anchor opening through which one or more auxiliary bone anchors can be disposed to augment the fixation of the assembly's primary bone anchor. A distal surface of the distal portion of the wing can be obliquely angled relative to a proximal-distal axis of the spanning portion to face one of a caudal direction or a cephalad direction. A distal surface of the distal portion of the wing can be obliquely angled relative to the proximal-distal axis of the spanning portion to face one of a medial direction or a lateral direction. Surgical methods using the bone anchor assemblies described herein are also disclosed.

First claim

The invention claimed is:

1. A bone anchor assembly, comprising:
a bone anchor;
an auxiliary bone anchor;
a receiver member coupled to a proximal end of the bone anchor and defining a rod seat configured to receive a rod;
a closure mechanism threadably mated to the receiver member;
a wing that includes a proximal portion, a distal portion, and a spanning portion that connects the proximal and distal portions, the proximal portion having a distal-facing surface that opposes a proximal terminal end of the receiver member and defines an opening through which at least a portion of the closure mechanism is disposed, the spanning portion extending vertically along a side wall of the receiver member between the proximal portion and the distal portion, the distal portion extending outward from a distal end of the spanning portion; and
a nut configured to threadably engage the closure mechanism to secure the proximal portion of the wing to the receiver member,
wherein the distal portion of the wing defines a bone anchor opening through which the auxiliary bone anchor is disposed, and wherein a distal surface of the distal portion of the wing is obliquely angled relative to a proximal-distal axis of the spanning portion to face one of a medial direction or a lateral direction,
wherein a proximal surface of the distal portion is distal to a distal surface of the proximal portion.

2. The bone anchor assembly of claim 1 , wherein the distal surface of the distal portion of the wing is obliquely angled inward towards the proximal-distal axis of the spanning portion.

3. The bone anchor assembly of claim 1 , wherein the distal surface of the distal portion of the wing is obliquely angled outward away from the proximal-distal axis of the spanning portion.

4. The bone anchor assembly of claim 1 , wherein a proximal surface of the distal portion of the wing is substantially parallel to the distal surface of the distal portion.

5. The bone anchor assembly of claim 1 , wherein the auxiliary bone anchor has a threaded proximal head and the bone anchor opening has a partially threaded interior surface configured to engage the threaded proximal head of the auxiliary bone anchor such that the auxiliary bone anchor is capable of being locked at any angle amongst a plurality of selectable angles relative to the central axis of the bone anchor opening.

6. The bone anchor assembly of claim 1 , wherein the closure mechanism comprises a threaded post having a radially extending shoulder portion and wherein a counter bore is formed about the opening in the distal-facing surface of the proximal portion of the wing to accommodate the radially extending shoulder portion extending at least partially above the proximal terminal end of the receiver member.

7. The bone anchor assembly of claim 1 , wherein the bone anchor opening defined in the distal portion of the wing comprises a plurality of bone anchor openings.

8. The bone anchor assembly of claim 1 , wherein a central axis of the bone anchor opening is substantially perpendicular to the distal surface of the distal portion such that the central axis of the bone anchor opening extends in the medial direction or the lateral direction.

9. The bone anchor assembly of claim 1 , wherein the wing includes a unilateral locking interface, wherein the unilateral locking interface is configured to enable a surgical instrument to hold onto one side of the wing.

10. A bone anchor assembly, comprising:
a bone anchor;
an auxiliary bone anchor;
a receiver member coupled to a proximal end of the bone anchor and defining a rod seat configured to receive a rod;
a closure mechanism threadably mated to the receiver member;
a wing that includes a proximal portion, a distal portion, and a spanning portion that connects the proximal and distal portions, the proximal portion having a distal-facing surface that opposes a proximal terminal end of the receiver member and defines an opening through which at least a portion of the closure mechanism is disposed, the spanning portion extending longitudinally from the proximal portion to the distal portion with a lateral surface of the spanning portion configured to face a side wall of the receiver member, the distal portion extending outward from a distal end of the spanning portion; and
a nut configured to threadably engage the closure mechanism to secure the proximal portion of the wing to the receiver member;
wherein the distal portion of the wing defines a bone anchor opening through which the auxiliary bone anchor is disposed; and
wherein a distal surface of the distal portion of the wing is obliquely angled relative to a proximal-distal axis of the spanning portion within a plane that extends through the proximal-distal axis of the spanning portion perpendicular to the lateral surface of the spanning portion; and
wherein a proximal surface of the distal portion is distal to a distal surface of the proximal portion.

11. The bone anchor assembly of claim 10 , wherein the distal surface of the distal portion of the wing is angled to face towards the spanning portion.

12. The bone anchor assembly of claim 10 , wherein the distal surface of the distal portion of the wing is angled to face away from the spanning portion of the wing.

13. The bone anchor assembly of claim 10 , wherein the spanning portion is deformable to allow angling of the distal portion of the wing.

Assignees

• Medos Int Sarl

Inventors

• Lee Kevin
• Hall Mark
• Ramsay Christopher
• Hawkins John Riley
• Montello Albert
• Peterson Joseph
• Johnston Benjamin
• Koller Heiko
• Albert Todd
• Ames Christopher
• Currier Bradford
• Thome Claudius
• Neo Masashi

Classifications

• A61B17/7034 Primary

  characterised by a lateral opening · CPC title

• A61B17/7044 Primary

  also having plates, staples or washers bearing on the vertebrae · CPC title

• A61B17/7058

  Plates mounted on top of bone anchor heads or shoulders · CPC title

• A61B17/7002

  Longitudinal elements, e.g. rods · CPC title

• A61B17/7035

  Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other · CPC title