Femoral component for an implantable hip prosthesis

Patent metadata

Field	Value
Publication number	US-9717597-B2
Application number	US-201614995843-A
Country	US
Kind code	B2
Filing date	Jan 14, 2016
Priority date	Mar 14, 2013
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

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. An orthopaedic hip prosthesis, comprising:
an implantable distal stem component including:
a core formed from a material having a high tensile strength and a high elastic modulus, and
a shell extending over the core, the shell including (i) a sheath extending over a proximal end of the core, the sheath having a tapered post configured to be received in a tapered bore of an implantable head component, and (ii) a cover layer extending distally from the sheath, the cover layer engaging only a lateral surface of a distal end of the core,

wherein the shell is formed from a polymeric material,
wherein the core has a proximal end that is positioned in the tapered post of the sheath.

2. The orthopaedic hip prosthesis of claim 1 , wherein when the orthopaedic hip prosthesis is viewed in a transverse plane extending through the shell and the core, (i) a first thickness is defined between a medial-most point of the shell and a medial-most point of a medial surface of the core, and (ii) a second thickness is defined between a lateral-most point of the shell and a lateral-most point of a lateral surface of the core, the first thickness being less than the second thickness.

3. The orthopaedic hip prosthesis of claim 1 , wherein the shell is formed from a metal-polymer composite material.

4. The orthopaedic hip prosthesis of claim 1 , wherein the core is formed from a cobalt-chromium alloy.

5. The orthopaedic hip prosthesis of claim 1 , wherein the core is formed from a titanium alloy.

6. The orthopaedic hip prosthesis of claim 1 , wherein the implantable head component includes a body including a spherical surface, and a polymeric insert positioned in the body, the insert having the tapered bore defined therein.

Assignees

• Depuy Synthes Products Inc

Inventors

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

Classifications

• A61F2002/30011

  differing in porosity · CPC title

• A61F2310/00029

  Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium · CPC title

• A61F2310/00023

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

• A61F2002/365

  Connections of heads to necks · CPC title

• A61F2/3662 Primary

  Femoral shafts · CPC title