Glenoid adapter for shoulder joint prosthesis

Patent metadata

Field	Value
Publication number	US-11523911-B2
Application number	US-202017290572-A
Country	US
Kind code	B2
Filing date	Jun 12, 2020
Priority date	Jun 14, 2019
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

The present invention relates to an improved glenoid adapter for shoulder prostheses, in particular for the conversion of an anatomic resurfacing prosthesis to a reverse shoulder prosthesis, comprising: •—at least one fixing projection ( 2 ) having an own axis (X) and being arranged to be fixed to the glenoid cavity ( 301 ) of the scapula ( 300 ) •—a flange ( 4 ) integral with said fixing projection ( 2 ); •—an attachment portion ( 3 ) integral with the flange ( 4 ) and extended in the direction opposite said fixing projection ( 2 ), as well as arranged to be coupled with an articular component ( 10 ) of reverse prosthesis provided with a convex articular surface ( 11 ), said attachment portion ( 3 ) having an own longitudinal axis (Y); both the fixing projection ( 2 ) and the attachment portion ( 3 ) have truncated-cone shape and that the axis of the attachment portion (Y) is misaligned with respect to the fixing projection axis (X); said flange ( 4 ) has a glenoid surface ( 4 a ) from which said fixing attachment ( 2 ) rises.

First claim

What is claimed is:

1. A glenoid adapter for allowing a conversion from an anatomic resurfacing prosthesis to a reverse shoulder prosthesis, comprising:
at least one fixing projection structured as an internally hollow pin having an own axis and being arranged to be fixed to the glenoid cavity of the scapula through a glenoid anchor;
a flange integral with said fixing projection;
an attachment portion integral with the flange and extended in a direction opposite said fixing projection, as well as arranged to be coupled with an articular component of reverse prosthesis provided with a convex articular surface, said attachment portion having an own longitudinal axis;
wherein both the fixing projection and the attachment portion have truncated-cone shape and wherein the axis of the attachment portion is misaligned with respect to the fixing projection axis;
said flange having a glenoid surface from which said fixing projection rises.

2. The adapter according to the claim 1 , wherein said truncated-cone shaped fixing projection is arranged to be fixed to said glenoid anchor, which is in turn fixable to said glenoid cavity through a security screw.

3. The adapter according to claim 2 , wherein said glenoid anchor is an internally hollow pin and has a medial end and an open proximal end communicating with an internal cavity being in turn defined by an internal surface; said fixing projection of said adapter comprising an external surface which can be coupled with interference or Morse cone coupling with said internal surface of said internal cavity.

4. The adapter according to claim 3 , wherein said external surface is cone-shaped and said internal surface of the glenoid anchor cavity is also cone-shaped.

5. The adapter according to claim 3 , wherein said medial end of said glenoid anchor is opened by a hole, which communicates with said internal cavity; said fixing projection comprising a projection through-hole for inserting a first securing screw which can be engaged during screwing within said hole of said glenoid anchor.

6. The adapter according to claim 1 , wherein said flange comprises a preferably convex proximal surface arranged to be in contact with said glenoid cavity, and a distal surface opposite to said proximal surface; said fixing projection extending in medial direction from said proximal surface; said attachment portion extending in a side direction from said distal surface.

7. The adapter according to claim 6 , wherein said flange has a substantially spherical-cap shape, said fixing projection axis intersecting a peripheral area of said proximal surface.

8. The adapter according to claim 6 , wherein said flange has a substantially spherical-cap shape, said attachment portion axis intersecting a peripheral area of said proximal surface.

9. The adapter according to claim 6 , wherein said flange comprises at least one through-hole which crosses said flange from said proximal surface to said distal surface for passing at least one stabilization bone screw, which can be inserted in said glenoid cavity.

10. The adapter according to claim 9 , wherein at least one central through-hole is substantially formed in the centre of said proximal surface.

11. The adapter according to claim 9 , wherein said flange has a substantially spherical-cap shape, at least one peripheral through-hole being formed at a peripheral area of said proximal surface.

12. The adapter according to claim 1 , wherein said attachment portion comprises a threaded cylindrical cavity; said articular component of reverse prosthesis being associable with said attachment portion by means of a second securing screw engaging with said cylindrical cavity.

13. The adapter according to claim 1 , wherein said attachment portion comprises an external attachment surface couplable in contact with an internal coupling surface of said articular component.

14. The adapter according to the claim 13 , wherein said external attachment surface is cone-shaped and said internal coupling surface is also cone-shaped.

15. A reverse shoulder joint prosthesis comprising:
a glenoid adaptor according to claim 1 ;
a glenoid anchor of a resurfacing prosthesis, within which the fixing projection of the glenoid adapter is fixed; and
a convex articular component of inverse prosthesis coupled with the attachment portion of the glenoid adapter.

16. A method for converting a resurfacing prosthesis to a reverse prosthesis by using an adapter according to claim 1 , comprising the steps of:
removing an insert from a glenoid anchor of a resurfacing prosthesis implanted in a glenoid cavity of a scapula, leaving the glenoid anchor implanted in the glenoid cavity;
fixing a glenoid adapter according to claim 1 to said glenoid anchor by inserting the fixing projection of the adapter within an internal cavity of the glenoid anchor and causing a proximal surface of the flange to adhere to the glenoid cavity.

Assignees

• Limacorporate Spa

Inventors

• Fattori Andrea
• Ursella Simone

Classifications

• A61F2002/30332

  Conically- or frustoconically-shaped protrusion and recess · CPC title

• A61F2/30749 Primary

  Fixation appliances for connecting prostheses to the body · CPC title

• A61F2002/4085

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

• A61F2002/30507

  using a threaded locking member, e.g. a locking screw or a set screw · CPC title

• A61F2/4081 Primary

  Glenoid components, e.g. cups · CPC title