Humeral implant anchor system

Patent metadata

Field	Value
Publication number	US-11432933-B2
Application number	US-202016740314-A
Country	US
Kind code	B2
Filing date	Jan 10, 2020
Priority date	Jan 24, 2014
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

A stemless humeral shoulder assembly having a base member and an anchor advanceable into the base member. The base member can include a distal end that can be embedded in bone and a proximal end that can be disposed at a bone surface. The base member can also have a plurality of spaced apart arms projecting from the proximal end to the distal end. The anchor can project circumferentially into the arms and into a space between the arms. When the anchor is advanced into the base member, the anchor can be exposed between the arms. A recess can project distally from a proximal end of the anchor to within the base member. The recess can receive a mounting member of an anatomical or reverse joint interface.

First claim

What is claimed is:

1. A stemless humeral shoulder assembly, comprising:
a mounting member of a shoulder joint articular interface component; and
a base member including:
a first end including a peripheral rim that encircles the first end and an inner member having an outside surface and an inside surface, the inside surface including an inner periphery of the base member, the inner member configured to receive and thereafter be located around an outside surface of the mounting member when the mounting member is advanced into the inner member of the base member;
a second end configured to be embedded in a bone;
at least one flat surface extending between the peripheral rim and the inner member, the at least one flat surface disposed at an elevation distal of a proximal-most aspect of the peripheral rim; and
a plurality of spaced apart arms extending radially outward of the outside surface of the inner member, each of the plurality of spaced apart arms including (i) an outer edge and first and second lateral surfaces extending from the outer edge toward the outside surface of the inner member, (ii) a plurality of openings extending through the first and second lateral surfaces and open toward the outside surface of the inner member, and (iii) an inner edge spaced apart from the outside surface of the inner member,
wherein the first and second lateral surfaces of each of the plurality of spaced apart arms are separated by a thickness, each of the first and second lateral surfaces extending from the second end of the base member toward the first end of the base member, each of the first and second lateral surfaces having a width measured in a radial direction, the width of each of the first and second lateral surfaces being greater than the thickness.

2. The stemless humeral shoulder assembly of claim 1 , wherein in each of the plurality of spaced apart arms, the plurality of openings are spaced apart along a longitudinal direction of a corresponding one of the each of the plurality of spaced apart arms.

3. The stemless humeral shoulder assembly of claim 1 , wherein in each of the plurality of spaced apart arms, the plurality of openings are a plurality of slots.

4. The stemless humeral shoulder assembly of claim 1 , wherein the plurality of spaced apart arms is three spaced apart arms.

5. The stemless humeral shoulder assembly of claim 1 , wherein each of the plurality of openings intersects a longitudinal axis of the respective one of the plurality of spaced apart arms.

6. The stemless humeral shoulder assembly of claim 1 , wherein the mounting member includes an anatomical joint interface configured to be received in the inner member.

7. The stemless humeral shoulder assembly of claim 1 , wherein each of the plurality of spaced apart arms comprises a porous structure.

8. The stemless humeral shoulder assembly of claim 2 , wherein the plurality of spaced apart arms and the peripheral rim form a monolithic structure.

9. The stemless humeral shoulder assembly of claim 2 , wherein the inner member projects from the first end of the base member and through the second end of the base member.

10. The stemless humeral shoulder assembly of claim 1 , wherein the plurality of spaced apart arms comprises three spaced apart arms extending between the first end and the second end of the monolithic base member, each of the three spaced apart arms comprising a porous structure.

11. The stemless humeral shoulder assembly of claim 1 , wherein each of the three plurality of spaced apart arms comprises an arcuate outer edge.

12. The stemless humeral shoulder assembly of claim 1 , wherein each of the plurality openings comprises a radially outer edge.

13. The stemless humeral shoulder assembly of claim 12 , wherein the radially outer edges of the plurality of openings in each of the plurality of spaced apart arms are located at different distances from the inner edge of each of the plurality of spaced apart arms along a radial direction of each of the plurality of spaced apart arms.

14. The stemless humeral shoulder assembly of claim 1 , wherein the first end of the base member comprises a plurality of arcuate openings.

15. The stemless humeral shoulder assembly of claim 14 , wherein each of the plurality of arcuate openings comprises a first straight edge, a second straight edge, and an arcuate edge therebetween.

16. A stemless humeral shoulder assembly, comprising:
a mounting member of a shoulder joint articular interface component; and
a stemless humeral bone coupler, comprising:
a first end comprising:
a peripheral rim that defines an outer circumference of the stemless humeral bone coupler; and
an inner member having an outside surface and an inside surface that defines a recess sized and configured to receive the mounting member;
a second end configured to be embedded in humeral bone;
a flat surface extending between the peripheral rim and the inner member, the at least one flat surface disposed at a distance distal of a proximal-most aspect of the peripheral rim; and
a plurality of spaced apart arms extending radially outward of the inner member, each of the plurality of spaced apart arms comprising:
an outer edge,
an inner edge, and
first and second lateral surfaces extending from the inner edge toward the outer edge and extending from the second end of the base member toward the first end of the base member,
wherein the inner edge that is spaced apart from the inner member such that an opening is defined between the inner member and the inner edge, the opening extending from the first lateral face to the second lateral face,
wherein the first and second lateral surfaces of each of the plurality of spaced apart arms are separated by a thickness and have a width extending from the inner edge toward the outer edge in a radial direction, and
wherein the width of each of the first and second lateral surfaces is greater than the thickness.

17. The stemless humeral shoulder assembly of claim 16 , wherein the plurality of spaced apart arms includes four arms.

18. The stemless humeral shoulder assembly of claim 16 , wherein the inner member and the plurality of spaced apart arms comprise a unitary structure.

19. The stemless humeral shoulder assembly of claim 18 , the inner member and the plurality of spaced apart arms are configured to be advanced into the humeral bone.

20. The stemless humeral shoulder assembly of claim 16 , wherein the inner member is cylindrical.

21. The stemless humeral shoulder assembly of claim 16 , wherein at least the plurality of arms of the stemless humeral bone coupler comprise a porous structure.

22. The stemless humeral shoulder assembly of claim 21 , wherein at least the plurality of arms of the stemless humeral bone coupler comprise titanium.

23. A kit comprising:
the stemless humeral shoulder assembly of claim 16 ;
a pin configured to guide a reaming instrument; and
a tool comprising radial projections configured to create channels in cancellous bone, each channel configured to receive one of the arms of the plurality of arms.

Assignees

• Howmedica Osteonics Corp

Inventors

• Hodorek Brian C
• Knox Kevin P
• Edwards Thomas Bradley

Classifications

• A61F2002/4018

  Heads or epiphyseal parts of humerus · CPC title

• A61B17/1684

  for the shoulder · CPC title

• A61F2/4059

  Humeral shafts · CPC title

• A61B17/1778

  for the shoulder · CPC title

• A61F2/4014 Primary

  Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts · CPC title