Stemless humeral component of an orthopaedic shoulder prosthesis

Patent metadata

Field	Value
Publication number	US-9700437-B2
Application number	US-201514885544-A
Country	US
Kind code	B2
Filing date	Oct 16, 2015
Priority date	Mar 30, 2012
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A stemless humeral component for replacing the humeral head of a patient's humerus includes a support flange having a number of cantilevered legs extending distally away from a bottom surface thereof. Instruments and methods for surgically installing the stemless humeral component are also disclosed.

First claim

The invention claimed is:

1. An orthopaedic shoulder prosthesis for replacing the humeral head of a patient's humerus, comprising:
a humeral head component comprising (i) a generally hemispherically-shaped bearing surface, (ii) a backside surface opposite the bearing surface, and (iii) a tapered locking mechanism formed in the backside surface, and
a stemless humeral component comprising (i) a circular-shaped flange, the circular-shaped flange having a plurality of revision slots formed therein, (ii) a tapered locking mechanism formed in the circular-shaped flange, the tapered locking mechanism of the stemless humeral component being configured to engage the tapered locking mechanism of the humeral head component so as to taper lock the humeral head component and the stemless humeral component to one another, and (iii) a plurality of cantilevered legs extending laterally away from the bottom surface of the circular-shaped flange,
wherein (i) each of the plurality cantilevered legs has one end thereof secured to the bottom surface of the circular-shaped flange at a location that is positioned radially between a center of the circular-shaped flange and a radial outer edge of the circular-shaped flange, and (ii) each of the plurality of revision slots is positioned on the circular-shaped flange at a location above, and radially outwardly from, one of the plurality of cantilevered legs so as to be radially located between the plurality of cantilevered legs and the radial outer edge of the circular-shaped flange.

2. The orthopaedic shoulder prosthesis of claim 1 , wherein:
the tapered locking mechanism of the humeral head component comprises a tapered post extending laterally away from the backside surface,
the tapered locking mechanism of the stemless humeral component comprises an elongated sleeve secured to, and extending laterally away from, the bottom surface of the circular-shaped flange, and
the elongated sleeve has a tapered bore formed therein, the tapered bore being configured to receive the tapered post of the humeral head component.

3. The orthopaedic shoulder prosthesis of claim 2 , wherein a second end of each of the plurality of cantilevered legs is spaced apart from both the other cantilevered legs and the elongated sleeve.

4. The orthopaedic shoulder prosthesis of claim 1 , wherein the circular-shaped flange is sized such that the radial outer edge thereof is positioned in contact with cortical bone tissue of the patient's humerus when the stemless shoulder component is secured to the patient's humerus.

5. The orthopaedic shoulder prosthesis of claim 4 , wherein each of the plurality of cantilevered legs is positioned radially inwardly of the radial outer edge of the circular-shaped flange at a location such that each of the plurality of cantilevered legs is in contact with cancellous bone tissue of the patient's humerus when the stemless shoulder component is secured to the patient's humerus.

6. The orthopaedic shoulder prosthesis of claim 1 , wherein the diameter of the circular-shaped flange is the same as the diameter of the backside surface of the humeral head component.

7. The orthopaedic shoulder prosthesis of claim 1 , wherein each of the plurality of cantilevered legs comprises a bone-engaging plate having a plurality of serrations formed therein.

8. The orthopaedic shoulder prosthesis of claim 7 , wherein each of the plurality of cantilevered legs further comprises an elongated rib secured to the bone-engaging plate and extending inwardly therefrom in a direction toward the center of the circular-shaped flange.

9. An orthopaedic shoulder prosthesis for replacing the humeral head of a patient's humerus, comprising:
a humeral head component comprising (i) a generally hemispherically-shaped bearing surface, (ii) a backside surface opposite the bearing surface, and (iii) a tapered post extending laterally away from the backside surface, and
a stemless humeral component comprising (i) a circular-shaped flange, the circular-shaped flange having a plurality of revision slots formed therein, (ii) an elongated sleeve, secured to, and extending laterally away from a bottom surface of the circular-shaped flange, the elongated sleeve having formed therein a tapered bore configured to receive the tapered post of the humeral head component, and (iii) a plurality of cantilevered legs extending laterally away from the bottom surface of the circular-shaped flange in the same direction as the elongated sleeve,
wherein (i) each of the plurality of cantilevered legs has one end thereof secured to the bottom surface of the circular-shaped flange at a location that is positioned radially between the elongated sleeve and a radial outer edge of the circular-shaped flange, and (ii) each of the plurality of revision slots is positioned on the circular-shaped flange at a location above, and radially outwardly from, one of the plurality of cantilevered legs so as to be radially located between the plurality of cantilevered legs and the radial outer edge of the circular-shaped flange.

10. The orthopaedic shoulder prosthesis of claim 9 , wherein a second end of each of the cantilevered legs is spaced apart from both the other cantilevered legs and the elongated sleeve.

11. The orthopaedic shoulder prosthesis of claim 9 , wherein the circular-shaped flange is sized such that the radial outer edge thereof is positioned in contact with cortical bone tissue of the patient's humerus when the stemless shoulder component is secured to the patient's humerus.

12. The orthopaedic shoulder prosthesis of claim 11 , wherein each of the plurality of cantilevered legs is positioned radially inwardly of the radial outer edge of the circular-shaped flange at a location such that each of the plurality of cantilevered legs is in contact with cancellous bone tissue of the patient's humerus when the stemless shoulder component is secured to the patient's humerus.

13. The orthopaedic shoulder prosthesis of claim 9 , wherein the diameter of the circular-shaped flange is the same as the diameter of the backside surface of the humeral head component.

14. The orthopaedic shoulder prosthesis of claim 9 , wherein each of the plurality of cantilevered legs comprises a bone-engaging plate having a plurality of serrations formed therein.

15. The orthopaedic shoulder prosthesis of claim 14 , wherein each of the plurality of serrations is angled upwardly in a direction toward the circular-shaped flange.

16. The orthopaedic shoulder prosthesis of claim 14 , wherein each of the plurality of cantilevered legs further comprises an elongated rib secured to the bone-engaging plate and extending inwardly therefrom in a direction toward the elongated sleeve.

17. The orthopaedic shoulder prosthesis of claim 9 , wherein:
the elongated sleeve has a threaded bore formed therein, and
the threaded bore extends medially away from a distal end of the elongated sleeve and opens into the tapered bore.

18. The orthopaedic shoulder prosthesis of claim 9 , wherein the circular-shaped flange has a number of viewing windows formed therein at a radial location between the elongated sleeve and the plurality of cantilevered legs.

Assignees

• Depuy Synthes Products Inc

Inventors

• Anthony Sarah
• Poncet Didier
• Warlop David M
• Zanchin Laurent
• Lawrence Chad
• Lubensky Scott A
• Long Jack F
• Iannotti Joseph P
• Jensen Kirk L
• Ekelund Anders

Classifications

• A61F2/4603

  for insertion or extraction of endoprosthetic joints or of accessories thereof · CPC title

• A61F2002/30616

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

• A61F2002/4619

  for extraction · CPC title

• A61B90/06

  Measuring instruments not otherwise provided for · CPC title

• A61F2002/4037

  Connections of heads to necks · CPC title