US 7,850,738 B2Granted

Bimetal acetabular component construct for hip joint prosthesis

OwnerDaniel E. E. Hayes, Jr., Alfred S. Depres, IIIinventors

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Abstract

This invention provides a prosthetic acetabular component that comprises two constructs, one being a metal base construct that engages the bone and the other being a polyethylene bearing construct that attaches to the metal base construct and articulates with a femoral stem prosthetic component. The metal base construct is composed of two different metals, one of which engages the bone surface and the other of which engages the polyethylene bearing construct. Each of these metals is selected so that its characteristics are well suited to its particular function. The first metal is selected so as to provide a superior bone-engaging face, while the second metal is selected so as to provide a superior polyethylene-engaging face. By combining the different material characteristics of two different metals in the metal bone construct, it is possible to simultaneously form a superior bone-engaging face and a superior polyethylene-engaging face.

Claims5

Dependent claims

A prosthetic acetabular component for a prosthetic total hip joint, the component comprising:

first and second discrete constructs;
said first construct comprising a metal base construct adapted to engage a bone;
and
said second construct comprising a polyethylene bearing connectable to said first construct in a snap-fit fashion and being adapted to articulate with a prosthetic femoral stem component on an opposing side of the joint;
wherein said metal base construct comprises first and second adjacent layers of different metals, a first of said metals being adapted to engage a surface of the bone and a second of said metals being adapted to engage a domed surface of said second construct;
wherein said first metal is of a different primary constituent than said second metal;
said first metal being adapted to provide a superior bone-engaging surface, and
said second metal being adapted to provide a superior polyethylene-engaging surface;
wherein said metal base construct is provided with a metal seat and an internal groove, and
said polyethylene bearing construct is provided with a flange adapted to snap into the groove to provide the snap-fit connectibility of said two discrete constructs;
and
wherein the flange is of substantially annular configuration in plan view and extends from said bearing construct peripheral wall outwardly and distally, and
said metal base construct is provided with an inwardly-projecting rail which in part defines the internal groove, and
the flange is undercut by a substantially annular groove;
wherein the flange is adapted to flex distally into the annular groove to override the rail and snap into the metal construct internal groove;
wherein said metal base construct is adapted to be secured to a hip and press fit with the socket of the acetabulum of the hip after removal of the acetabulum;
and
wherein said first metal comprises a material which is biocompatible and exhibits bone ingrowth properties.

15 more elements

A prosthetic acetabular component for a prosthetic total hip joint, the component comprising:

first and second discrete constructs;
said first construct comprising a metal base construct adapted to engage a bone;
and
said second construct comprising a polyethylene bearing connectable to said first construct in a snap-fit fashion and being adapted to articulate with a prosthetic femoral stem component on an opposing side of the joint;
wherein said metal base construct comprises first and second adjacent layers of different metals, a first of said metals being adapted to engage a surface of the bone and a second of said metals being adapted to engage a domed surface of said second construct;
wherein said first metal is of a different primary constituent than said second metal;
said first metal being adapted to provide a superior bone-engaging surface, and
said second metal being adapted to provide a superior polyethylene-engaging surface;
wherein said metal base construct is provided with a metal seat and an internal groove, and
said polyethylene bearing construct is provided with a flange adapted to snap into the groove to provide the snap-fit connectibility of said two discrete constructs;
and
wherein the flange is of substantially annular configuration in plan view and extends from said bearing construct peripheral wall outwardly and distally, and
said metal base construct is provided with an inwardly-projecting rail which in part defines the internal groove, and
the flange is undercut by a substantially annular groove;
wherein the flange is adapted to flex distally into the annular groove to override the rail and snap into the metal construct internal groove;
wherein said metal base construct is adapted to be secured to a hip and press fit with the socket of the acetabulum of the hip after removal of the acetabulum;
and
wherein said first metal comprises a selected one of a group of metals consisting of titanium, titanium alloy, tantalum, and tantalum alloy.

15 more elements

A prosthetic acetabular component for a prosthetic total hip joint, the component comprising:

first and second discrete constructs;
said first construct comprising a metal base construct adapted to engage a bone;
and
said second construct comprising a polyethylene bearing connectable to said first construct in a snap-fit fashion and being adapted to articulate with a prosthetic femoral stem component on an opposing side of the joint;
wherein said metal base construct comprises first and second adjacent layers of different metals, a first of said metals being adapted to engage a surface of the bone and a second of said metals being adapted to engage a domed surface of said second construct;
wherein said first metal is of a different primary constituent than said second metal;
said first metal being adapted to provide a superior bone-engaging surface, and
said second metal being adapted to provide a superior polyethylene-engaging surface;
wherein said metal base construct is provided with a metal seat and an internal groove, and
said polyethylene bearing construct is provided with a flange adapted to snap into the groove to provide the snap-fit connectibility of said two discrete constructs;
and
wherein the flange is of substantially annular configuration in plan view and extends from said bearing construct peripheral wall outwardly and distally, and
said metal base construct is provided with an inwardly-projecting rail which in part defines the internal groove, and
the flange is undercut by a substantially annular groove;
wherein the flange is adapted to flex distally into the annular groove to override the rail and snap into the metal construct internal groove;
wherein said metal base construct is adapted to be secured to a hip and press fit with the socket of the acetabulum of the hip after removal of the acetabulum;
and
wherein said second metal comprises a material which exhibits high hardness and is scratch resistant.

15 more elements

A prosthetic acetabular component for a prosthetic total hip joint, the component comprising:

first and second discrete constructs;
said first construct comprising a metal base construct adapted to engage a bone;
and
said second construct comprising a polyethylene bearing connectable to said first construct in a snap-fit fashion and being adapted to articulate with a prosthetic femoral stem component on an opposing side of the joint;
wherein said metal base construct comprises first and second adjacent layers of different metals, a first of said metals being adapted to engage a surface of the bone and a second of said metals being adapted to engage a domed surface of said second construct;
wherein said first metal is of a different primary constituent than said second metal;
said first metal being adapted to provide a superior bone-engaging surface, and
said second metal being adapted to provide a superior polyethylene-engaging surface;
wherein said metal base construct is provided with a metal seat and an internal groove, and
said polyethylene bearing construct is provided with a flange adapted to snap into the groove to provide the snap-fit connectibility of said two discrete constructs;
and
wherein the flange is of substantially annular configuration in plan view and extends from said bearing construct peripheral wall outwardly and distally, and
said metal base construct is provided with an inwardly-projecting rail which in part defines the internal groove, and the flange is undercut by a substantially annular groove;
wherein the flange is adapted to flex distally into the annular groove to override the rail and snap into the metal construct internal groove;
wherein said metal base construct is adapted to be secured to a hip and press fit with the socket of the acetabulum of the hip after removal of the acetabulum;
and
wherein said first construct is provided in walls thereof, proximate a bottom surface thereof, a series of apertures extending through said first construct, the series of apertures extending completely around said first construct.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/989,245Filed 15 Nov 2004 · continuation
Priority: 14 May 1998
Published: US 2005/0102034 A112 May 2005
Granted: 14 Dec 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification64 codes

A61F 2/30767
Joints: special external or bone-contacting surface, e.g. coating for improving bone ingrowth
A61F 2/32
Joints: for the hip
A61F 2/34
For the hip: acetabular cups
A61L 27/047
Metals or alloys: other specific metals or alloys not covered by A61L27/042 - A61L27/045 or A61L27/06

Family

Application09/079,502Parent of this continuation · filed 14 May 1998
Application60/219,962Us provisional application · filed 20 Jul 2000
Application09/901,310Parent of this continuation-in-part · filed 9 Jul 2001
Application09/910,653Parent of this continuation · filed 19 Jul 2001
US 2005/0102034 A1Pre-grant publication · published 12 May 2005
US 6,827,742 B2Parent of this continuation
US 7,105,030 B2Parent of this continuation-in-part
Application09/910,653Parent of this continuation-in-part
US 6,261,322 B1Parent of this continuation
Application09/901,310Parent of this continuation
US 2002/0016635 A1Published application
US 2002/0052659 A1Published application
US 7,850,738 B2This patent

From the US filing history. Foreign family members aren’t listed.