Systems for reverse shoulder implants

Patent metadata

Field	Value
Publication number	US-12064353-B2
Application number	US-202117227971-A
Country	US
Kind code	B2
Filing date	Apr 12, 2021
Priority date	Oct 29, 2012
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

Embodiments of the present invention include a convertible prosthesis that is capable of conversion from a humeral head replacement to a reverse reconstruction without any removal of parts integrated into the patient's bony anatomy (e.g. implant stems). A desired overall implant inclination angle may be achieved by matching various implant stems with various reverse inserts, thus permitting a resection surface to be matched with an implant stem selection while also permitting a desired overall implant inclination angle to be achieved through the selection of an appropriate insert.

First claim

What is claimed is:

1. A system for modular reverse shoulder prosthesis, the system comprising:
a humeral component having a proximal cavity, the proximal cavity including a bottom surface and an inner sidewall;
a plurality of teeth provided on the bottom surface of the proximal cavity;
an insert having a distal end and a proximal end, the distal end configured to engage the proximal cavity of the humeral component and including a surface opposing the bottom surface of the proximal cavity when the insert is inserted into the proximal cavity; and
fins projecting inwardly from the inner sidewall of the proximal cavity, the fins projecting to an inner diameter that is smaller than an outer diameter of an outer sidewall of the insert, the fins arranged with respect to the proximal cavity of the humeral component such that the fins assist in securing the insert against rotation about an insert axis with respect to the humeral component, wherein
the distal end of the insert includes the outer sidewall, the outer sidewall is defined about the insert axis, the proximal end includes a concave articular surface,
the plurality of teeth engage the surface opposing the bottom surface of the proximal cavity and secure the insert against rotation about the insert axis with respect to the humeral component, and
the fins deform the insert when the insert is inserted into the humeral component.

2. A system for modular reverse shoulder prosthesis, the system comprising:
a humeral component having a proximal cavity, the proximal cavity including a bottom surface and an inner sidewall;
a plurality of teeth provided on the bottom surface of the proximal cavity;
an insert having a distal end and a proximal end, the distal end configured to engage the proximal cavity of the humeral component and including a surface opposing the bottom surface of the proximal cavity when the insert is inserted into the proximal cavity; and
fins projecting inwardly from the inner sidewall of the proximal cavity, the fins projecting to an inner diameter that is smaller than an outer diameter of an outer sidewall of the insert, the fins arranged with respect to the proximal cavity of the humeral component such that the fins assist in securing the insert against rotation about an insert axis with respect to the humeral component, wherein
the distal end of the insert includes the outer sidewall, the outer sidewall is defined about the insert axis, the proximal end includes a concave articular surface,
the plurality of teeth engage the surface opposing the bottom surface of the proximal cavity and secure the insert against rotation about the insert axis with respect to the humeral component, and
the fins deform the insert by inelastically deforming the insert when the insert is inserted into the humeral component.

3. A system for modular reverse shoulder prosthesis, the system comprising:
a humeral component having a proximal cavity, the proximal cavity including a bottom surface and an inner sidewall;
a plurality of teeth provided on the bottom surface of the proximal cavity;
an insert having a distal end and a proximal end, the distal end configured to engage the proximal cavity of the humeral component and including a surface opposing the bottom surface of the proximal cavity when the insert is inserted into the proximal cavity; and
fins projecting inwardly from the inner sidewall of the proximal cavity, the fins projecting to an inner diameter that is smaller than an outer diameter of an outer sidewall of the insert, the fins arranged with respect to the proximal cavity of the humeral component such that the fins assist in securing the insert against rotation about an insert axis with respect to the humeral component, wherein
the distal end of the insert includes the outer sidewall, the outer sidewall is defined about the insert axis, the proximal end includes a concave articular surface,
the plurality of teeth engage the surface opposing the bottom surface of the proximal cavity and secure the insert against rotation about the insert axis with respect to the humeral component, and
the fins deform the insert by cutting the insert when the insert is inserted into the humeral component.

4. The system of claim 3 , wherein the fins are configured to secure the insert against rotation about the insert axis regardless of a rotational position of the insert about the insert axis when the insert is inserted into the humeral component.

5. The system of claim 4 , wherein the fins are at least three fins arranged on the inner sidewall in a rotationally symmetrical manner about the insert axis.

6. The system of claim 5 , wherein the fins are at least six fins arranged on the inner sidewall in the rotationally symmetrical manner about the insert axis.

7. The system of claim 3 , wherein the outer sidewall is at least partially cylindrical and has the outer diameter formed about the insert axis.

8. The system of claim 3 , wherein a first material out of which the fins are made is harder than a second material out of which the distal end of the insert is made.

9. The system of claim 3 , wherein the humeral component comprises a distal taper configured to mate with a proximal taper of a stem.

10. The system of claim 9 , wherein the distal taper is formed about a taper axis, and wherein the taper axis is offset from the insert axis when the insert is inserted into the humeral component, so as to permit eccentric rotation of the humeral component about the taper axis when the distal taper is inserted into the proximal taper of the stem.

11. The system of claim 3 , wherein the plurality of teeth project inwardly from the bottom of the proximal cavity.

12. The system of claim 3 , wherein the humeral component is configured to mate with a stem.

13. The system of claim 3 , wherein the insert includes a first channel formed circumferentially about the distal end, wherein the insert further includes a snap-fit ring seated at least partially within the first channel, and wherein the humeral component includes a second channel formed circumferentially within the proximal cavity, wherein the snap-fit ring is configured to become seated in both the first and second channels when the insert is inserted into the humeral component so as to secure the insert against separation from the humeral component.

14. The system of claim 13 , wherein the snap-fit ring has an at-rest configuration in which an inner diameter of the snap-fit ring is within the first channel and an outer diameter of the snap-fit ring is outside of the first channel, a compressed configuration in which the outer diameter of the snap-fit ring is seated fully within the first channel, and a partially compressed configuration in which the outer diameter of the snap-fit ring is smaller than the outer diameter of the snap-fit ring in the compressed configuration but not entirely seated within the first channel; wherein the snap-fit ring is configured to be in the at-rest configuration prior to insertion of the insert into the humeral component, wherein the snap-fit ring is configured to be in the compressed configuration as the insert is initially inserted into the humeral component, and wherein the snap-fit ring is configured to assume the partially compressed configuration when the snap-fit ring is seated in both the first and second channels.

15. The system of claim 14 , wherein the snap-fit ring reversibly secures the insert against separation from the humeral component.

16. The system of claim 15 , wherein the humeral component includes one or more holes formed from an outer surface of the

Assignees

• Stryker European Operations Ltd

Inventors

• Deransart Pierric
• Gaborit Vincent
• Maroney Brian
• Hodorek Brian C
• Gargac Shawn M
• Boileau Pascal
• Walch Gilles
• Favard Luc
• Clavert Philippe
• Sirveaux François
• Kelly James
• Krishnan Sumant
• Mole Daniel
• Comte Cédric
• Rundstadler Eric
• Mondi François
• Chuinard Christopher R
• Edwards Thomas Bradley

Classifications

• A61F2002/4085

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

• A61F2002/30477

  using sharp protrusions, e.g. spikes, for anchoring into connecting prosthetic part · CPC title

• A61F2002/4022

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

• A61F2002/30616

  Sets comprising a plurality of prosthetic parts of different sizes or orientations · CPC title

• A61F2002/30604

  modular · CPC title