Convertible stem / fracture stem

Patent metadata

Field	Value
Publication number	US-10433967-B2
Application number	US-201515532035-A
Country	US
Kind code	B2
Filing date	Dec 10, 2015
Priority date	Dec 10, 2014
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

A modular shoulder prosthesis is provided. The modular prosthesis includes a stem, an anatomic insert, and a reverse insert. The stem is a unitary body that includes a distal shaft portion and a proximal portion. The proximal portion includes a stem face configured to directly couple to both the anatomic insert and reverse insert. The stem face includes a first engagement feature configured to couple directly to the reverse insert and a second engagement feature configured to couple directly to the anatomic insert. The stem can also include a metaphyseal portion between the shaft portion and proximal portion designed for use in humeral fracture repair procedures. The metaphyseal portion can include a medial arm and two lateral arms extending between the shaft portion and proximal portion, A window can be defined between the medial arm and the lateral arms, and a gap can be formed between the lateral arms.

First claim

What is claimed is:

1. A kit for a shoulder prosthesis comprising:
a humeral anchor comprising a proximal portion and a distal portion, the proximal portion including a proximal face, the proximal face comprising a hole and a cavity that is distinct from the hole;
a reverse insert having a proximal portion and a distal portion, the proximal portion including a concave surface configured to receive a glenosphere and the distal portion comprising a protrusion, wherein the reverse insert is configured to directly couple to the cavity of the proximal face without engaging the hole; and
an anatomical insert having a proximal portion including a convex surface and a distal portion including a protrusion, wherein the anatomical insert is configured to directly couple to the hole of the proximal face.

2. The kit of claim 1 , wherein the anatomical insert is configured to rotationally engage the proximal face.

3. The kit of claim 2 , wherein the protrusion of the anatomical insert is configured to rotationally engage the hole of the proximal face.

4. The kit of claim 1 , wherein the humeral anchor is a fracture stem.

5. The kit of claim 1 , wherein the humeral anchor comprises a stem comprising a metaphyseal portion comprising a medial arm and first and second lateral arms extending between and connecting the distal portion and the proximal portion of the stem.

6. The kit of claim 5 , further comprising a bone graft.

7. The kit of claim 6 , wherein the bone graft is shaped to be received thereon the stem.

8. The kit of claim 6 , wherein the bone graft is selected from the group consisting of bone, stem cells, ceramic, polymer and porous metal.

9. The kit of claim 6 , wherein the bone is selected from the group consisting of an allograft and autograft.

10. The kit of claim 1 , wherein the proximal portion of the humeral anchor comprises a spherical portion.

11. The kit of claim 1 , the proximal face further comprising a groove extending around an inner periphery of the cavity.

12. The kit of claim 11 , the protrusion of the reverse insert further comprising a locking member configured to engage the groove of the proximal face.

13. The kit of claim 1 , the proximal face further comprising a sidewall and a ridge extending away from the sidewall to a peak, the peak of the ridge defining an inner dimension of the cavity, the inner dimension of the cavity defined by the peak of the ridge being smaller than an outer periphery of the protrusion of the distal portion of the reverse insert, whereby an interference fit is provided between the protrusion of the distal portion of the reverse insert and the cavity when the reverse insert is engaged with the humeral anchor.

14. The kit of claim 1 , whereby an interference fit is provided between the protrusion of the distal portion of the reverse insert and the cavity when the reverse insert is engaged with the humeral anchor.

15. The kit of claim 1 , wherein a periphery of the cavity is spaced from and surrounds the hole configured to receive the protrusion of the anatomical insert.

16. The kit of claim 1 , wherein the hole configured to receive the protrusion of the anatomical insert is at least partially formed in a raised portion of the proximal face, the raised portion extending proximally from a base of the cavity.

17. The kit of claim 16 , wherein a distal end of the protrusion of the reverse insert comprises a recess configured to engage the raised portion of the proximal face.

18. The kit of claim 17 , wherein an interface between the raised portion of the proximal face and the recess of the reverse insert is configured to resist rotation between the reverse insert and the humeral anchor.

19. The kit of claim 1 , wherein a central axis extending proximally and distally through the hole is offset from a central axis extending proximally and distally through the cavity.

20. The kit of claim 1 , wherein the reverse insert is configured to directly couple to the proximal face via a snap-fit.

21. A method of using the kit of claim 1 , the method comprising selecting intra-operatively to implant the reverse shoulder insert or the anatomical shoulder insert.

22. The kit of claim 1 , wherein the humeral anchor comprises:
a base member comprising a distal end configured to be embedded in bone and a proximal end to be disposed at a bone surface, the base member having a plurality of spaced apart arms and a concave member comprising the hole projecting from the proximal end toward the distal end; and
an anchor component comprising the proximal face and having a distal portion advanceable into the base member to a position disposed within the arms, the distal portion of the anchor component configured to project circumferentially into a space between the arms, the distal portion of the anchor component being exposed between the arms when the anchor component is advanced into the base member;
wherein the cavity is defined at least in part by the proximal face of the anchor component.

23. The kit of claim 22 wherein the proximal face of the anchor component comprises an aperture configured to be advanced over a proximal portion of the concave member.

24. The kit of claim 23 , wherein the proximal face comprises a driver interface disposed thereon outward of the aperture.

25. The kit of claim 22 , wherein the distal portion of the anchor component comprises a cylindrical sleeve and a thread projecting laterally therefrom.

26. The kit of claim 22 , further comprising a locking device disposed between the anchor component and the base member to prevent disengagement of the anchor component from the base member.

27. The kit of claim 1 , wherein the humeral anchor comprises a unitary body.

28. The kit of claim 1 , wherein the distal portion of the humeral anchor comprises a taper.

29. A kit for a shoulder prosthesis comprising:
a humeral anchor comprising a proximal portion and a distal portion, the proximal portion including a proximal face, the proximal face comprising a hole and a cavity that is distinct from the hole;
a reverse insert having a proximal portion and a distal portion, the proximal portion including a concave surface configured to receive a glenosphere and the distal portion comprising a protrusion, wherein the reverse insert is configured to directly couple to the cavity of the proximal face; and
an anatomical insert having a proximal portion including a convex surface and a distal portion including a protrusion, wherein the anatomical insert is configured to directly couple to the hole of the proximal face,
wherein a periphery of the cavity is spaced from and surrounds the hole configured to receive the protrusion of the anatomical insert.

30. The kit of claim 29 , wherein the anatomical insert is configured to rotationally engage the proximal face.

31. The kit of claim 29 , wherein the humeral anchor comprises a stem comprising a metaphyseal portion comprising a medial arm and first and second lateral arms extending between and connecting the distal portion and the proximal portion of the stem.

32. The kit of claim 29 , wherein the proximal portion of the humeral anchor comprises a spherical portion.

33. The kit of claim 29 , the proximal face further comprising a groove extending around an inner periphery of the cav

Assignees

• Tornier Sa

Inventors

• Deransart Pierric
• Fleury Cyrille Aroun Koumar
• Gaborit Vincent
• Boileau Pascal
• Chuinard Christopher R
• Clavert Philippe
• Favard Luc
• Kelly James
• Krishnan Sumant
• Sirveaux Francois

Classifications

• A61F2/4014 Primary

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

• A61F2002/30607

  Kits of prosthetic parts to be assembled in various combinations for forming different prostheses · CPC title

• A61F2002/4051

  Connections of heads directly to shafts · CPC title

• A61F2002/4022

  having a concave shape, e.g. hemispherical cups · CPC title

• A61F2002/4085

  having a convex shape, e.g. hemispherical heads · CPC title