Femoral component for an implantable hip prosthesis

Patent metadata

Field	Value
Publication number	US-10213314-B2
Application number	US-201715665658-A
Country	US
Kind code	B2
Filing date	Aug 1, 2017
Priority date	Mar 14, 2013
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

An orthopedic prosthesis for use in a hip replacement surgery includes an implantable stem component. The implantable stem component includes a core and a shell extending over the core. The shell includes a polymeric material and is configured to receive a femoral head component. Metal foam may extend over a portion of the shell.

First claim

The invention claimed is:

1. A method of manufacturing an orthopaedic hip prosthesis comprising:
forming a core from a material having a high tensile strength and a high elastic modulus, and
attaching a polymeric shell to the core to position a proximal end of the core in a base of a tapered post of the polymeric shell, wherein attaching the polymeric shell includes placing a cover layer of the polymeric shell only on a lateral surface of a distal end of the core,
wherein the tapered post of the polymeric shell extends from the base to a proximal tip, and the tapered post is sized to be received in a tapered bore of an implantable head component.

2. The method of claim 1 , wherein attaching the polymeric shell includes:
defining a first thickness of polymeric material between a medial-most point of the polymeric shell and a medial-most point of a medial surface of the core when viewed in a transverse plane, and
defining a second thickness of polymeric material between a lateral-most point of the polymeric shell and a lateral-most point of a lateral surface of the core when viewed in a transverse plane,
wherein the first thickness is less than the second thickness.

3. The method of claim 1 , wherein forming the core includes forming a medial surface of the core such that the medial surface has a first radius when the orthopaedic hip prosthesis is viewed in the transverse plane, and forming a lateral surface of the core such that the lateral surface has a second radius greater than the first radius when the orthopaedic hip prosthesis is viewed in the transverse plane.

4. The method of claim 1 , wherein forming the core includes forming the core from a cobalt-chromium alloy.

5. The method of claim 1 , wherein forming the core includes forming the core from a titanium alloy.

6. The method of claim 1 , further comprising securing the implantable head component to the tapered post.

7. A method of manufacturing an orthopaedic hip prosthesis comprising:
forming a core from a material having a high tensile strength and a high elastic modulus, wherein forming the core includes forming a medial surface of the core such that the medial surface has a first radius when the orthopaedic hip prosthesis is viewed in the transverse plane, and forming a lateral surface of the core such that the lateral surface has a second radius greater than the first radius when the orthopaedic hip prosthesis is viewed in the transverse plane, and
attaching a polymeric shell to the core to position a proximal end of the core in a base of a tapered post of the polymeric shell,
wherein the tapered post of the polymeric shell extends from the base to a proximal tip, and the tapered post is sized to be received in a tapered bore of an implantable head component.

8. The method of claim 7 , wherein attaching the polymeric shell includes:
defining a first thickness of polymeric material between a medial-most point of the polymeric shell and a medial-most point of a medial surface of the core when viewed in a transverse plane, and
defining a second thickness of polymeric material between a lateral-most point of the polymeric shell and a lateral-most point of a lateral surface of the core when viewed in a transverse plane,
wherein the first thickness is less than the second thickness.

9. The method of claim 7 , wherein forming the core includes forming the core from a cobalt-chromium alloy.

10. The method of claim 7 , wherein forming the core includes forming the core from a titanium alloy.

11. The method of claim 7 , further comprising securing the implantable head component to the tapered post.

Assignees

• Depuy Synthes Products Inc

Inventors

• Armacost John M
• Keefer Ryan C
• Mcanelly Jeffrey A

Classifications

• A61F2002/30011

  differing in porosity · CPC title

• A61F2002/365

  Connections of heads to necks · CPC title

• A61F2310/00023

  Titanium or titanium-based alloys, e.g. Ti-Ni alloys · CPC title

• A61F2002/30014

  differing in elasticity, stiffness or compressibility · CPC title

• A61F2/3662 Primary

  Femoral shafts · CPC title