Sleeve augment device for an articulated joint

Patent metadata

Field	Value
Publication number	US-11751996-B2
Application number	US-202217663414-A
Country	US
Kind code	B2
Filing date	May 13, 2022
Priority date	Jul 9, 2015
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

An augment device for a joint endoprosthesis, the device including a sleeve surrounding a channel extending through the sleeve. The sleeve is formed of porous material for ingrowth of bony material, the sleeve comprising an inner face and an outer face. The sleeve further comprises a wall surrounding the channel, the wall being made of solid material and forming a sandwich structure with the porous material, wherein the wall forms a bulkhead between the inner face and the outer face. Thereby, the bulkhead wall will stop inflow of any cement across the sleeve from its inner to its outer face. The porous material on the outer face will be kept free from cement and its capability to promote bone ingrowth is reliably preserved. The augment devices are preferably provided as a set having different sizes and straight or stepped bottoms for improved versatility and maximum preservation of natural bone matter.

First claim

The invention claimed is:

1. An augment device for a joint endoprosthesis, the device comprising:
a sleeve having a top and a bottom, a distance between said top and said bottom defining an entire height of said sleeve, wherein the sleeve surrounds a channel extending through the sleeve from the top to the bottom of the sleeve wherein the channel is configured to receive a stem of the joint endoprosthesis,
the sleeve being formed of porous material and comprising an inner face and an outer face, the inner face defining the channel, and a distance between the inner face and the outer face defining a thickness, wherein the porous material is configured for ingrowth of bony material,
the sleeve further comprising a wall that surrounds the channel and extends along the entire height of the sleeve, the wall being made of solid material and forming a layered structure with the porous material;
the sleeve further comprising at least one bending joint, said at least one bending joint having a lower bending stiffness in a lower portion than in an upper portion and extending for the entire height.

2. The augment device of claim 1 , wherein the sleeve is compressible in at least one of the media-lateral direction and the anterior/posterior direction.

3. The augment device of claim 1 , wherein the wall forms a complete bulkhead reaching over the entire device between the inner face and the outer face, the bulkhead being configured for blocking cement flow between the inner face and the outer face.

4. The augment device of claim 1 , wherein the wall serves as a reinforcing element.

5. The augment device of claim 1 , wherein the wall is located at an intermediate position along a direction of the thickness such that the porous material is formed on an inward facing side and an outward facing side of the wall.

6. The augment device of claim 1 , wherein the sleeve is of a generally conical shape.

7. The augment device of claim 6 , wherein the sleeve is wider at its top and has a cone angle between 10° and 45° .

8. The augment device of claim 1 , wherein the augment device is a tibial augment for a knee joint endoprosthesis.

9. The augment device of claim 1 , wherein the porous material comprises interconnected pores.

10. The augment device of claim 1 , further comprising a top cover made of solid material, wherein the top cover completely covers a top surface of the sleeve and leaves the channel open.

11. The augment device of claim 10 , wherein the sleeve comprises at least one recess and the top cover further comprises at least one extension cover which is configured to cover side faces or a bottom face of the at least one recess.

12. The augment device of claim 11 , wherein the top cover and the at least one extension cover are connected such as to provide a continuous top bulkhead.

13. The augment device of claim 1 , wherein edges of the sleeve are at least partly rounded, at least partly beveled, or at least partly rounded and beveled.

14. The augment device of claim 1 , wherein a raised structure having embossments is formed on the inner face.

15. The augment device of claim 1 , wherein a passageway extends through the entire sleeve, said passageway oriented to run across the channel.

16. The augment device of claim 1 , wherein the at least one bending joint comprises a void in the sleeve and a metal strip, wherein the metal strip spans the void.

17. The augment device of claim 16 , wherein the metal strip is oriented oblique with respect to the wall such that a lower end of the metal strip is positioned closer toward the outer face and an upper end of the metal strip is closer to the inner face.

18. The augment device of claim 16 , wherein the metal strip is oriented substantially parallel to a center axis of the channel.

19. The augment device of claim 1 , wherein the sleeve comprises a compensator element configured for adjusting a circumference of the sleeve in a bending state of the at least one bending joint.

20. The augment device of claim 19 , wherein the compensator element is configured as two overlapping tongues arranged in a sliding relationship.

Assignees

• Link Waldemar Gmbh Co

Inventors

• Bauer Eckhard
• Link Helmut D

Classifications

• A61F2/30734 Primary

  Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect · CPC title

• A61F2002/30827

  Plurality of grooves · CPC title

• A61F2002/30805

  Recesses of comparatively large area with respect to their low depth · CPC title

• A61F2002/30772

  Apertures or holes, e.g. of circular cross section · CPC title

• A61F2002/30738

  Sleeves · CPC title