US 6,719,800 B2 · Constrained prosthetic knee with rotating bearing · patentgrep

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Abstract

A constrained prosthetic knee having a modular hinge post and a rotating bearing. A cannulated hinge post is rotatably connected to the femoral component of the knee prosthesis so that a hinge post extension may be anteriorly positioned through the hinge post and into the tibial component of the knee prosthesis, after positioning of the femoral component in the femur and the tibial component in the tibia. The hinge post is preassembled to the femoral component so that such assembly is not required during the implantation procedure. A meniscal component forming the rotating bearing of the knee prosthesis is packaged together with the hinge post extension so that the appropriate hinge post extension is readily available. The meniscal component includes a mechanism for preventing lift off of the meniscal component from the tibial component, while allowing rotation of the meniscal component relative to the tibial component.

Claims25

Dependent claims

A prosthetic knee, comprising:

a femoral component including a condylar bearing surface;
a meniscal component including a cooperative bearing surface facing said condylar bearing surface of said femoral component;
and
a tibial component including guide means for guiding rotation of said meniscal component about an axis substantially perpendicular to a tibial tray of said tibial component, said guide means further for preventing substantial lift off of said meniscal component away from said tibial component.

1 more element

A prosthetic knee, comprising:

a femoral component including a condylar bearing surface;
a meniscal component including a cooperative bearing surface facing said condylar bearing surface of said femoral component;
and
a tibial component including a rotation protrusion cooperating with a cutout of said meniscal component to guide rotation of said meniscal component about an axis substantially perpendicular to a tibial tray of said tibial component, said rotation protrusion including a lip extending substantially parallel to said tibial tray of said tibial component, said rotation protrusion lip facing an opposing lip formed in said cutout in said meniscal component, said meniscal component lip being positioned between said tibial tray and said rotation protrusion lip.

1 more element

A prosthetic knee, comprising:

a femoral component including a condylar bearing surface;
a meniscal component including a cooperative bearing surface facing said condylar bearing surface of said femoral component;
and
a tibial component including a rotation protrusion positioned in a cutout of said meniscal component, said rotation protrusion including a lip extending substantially parallel to a tibial tray of said tibial component, said rotation protrusion lip facing an opposing lip formed in said cutout in said meniscal component, said meniscal component lip being positioned between said tibial tray and said rotation protrusion lip, said rotation protrusion moveable within said cutout of said meniscal component.

1 more element

A prosthetic knee, comprising:

a femoral component having a hinge post rotatably connected thereto, said hinge post including an elongate hinge post extension aperture sized for placement of a hinge post extension therein, whereby said hinge post extension traverses a first end of said hinge post extension aperture and protrudes from a second end of said hinge post extension aperture when operably positioned therein, said first and said second ends of said hinge post extension aperture comprising opposing ends of said elongate hinge post extension aperture, said first end of said hinge post extension aperture having threads cooperating with a threaded proximal end of said hinge post extension to connect said hinge post extension to said hinge post;
and
a tibial component including a second hinge post extension aperture, whereby said hinge post extension is positioned within said second hinge post extension aperture when the prosthetic knee is operably assembled.

A prosthetic knee, comprising:

a femoral component including a condylar bearing surface;
a meniscal component including a cooperative bearing surface facing said condylar bearing surface of said femoral component;
and
a tibial component including an anterior rotation protrusion, and a posterior rotation protrusion cooperating with an anterior cutout and a posterior cutout of said meniscal component, respectively, to guide rotation of said meniscal component about an axis substantially perpendicular to a tibial tray of said tibial component, said anterior rotation protrusion including an anterior lip extending substantially parallel to said tibial tray of said tibial component, said posterior rotation protrusion including a posterior lip extending substantially parallel to said tibial tray of said tibial component, said anterior rotation protrusion lip facing an anterior opposing lip formed in said anterior cutout of said meniscal component, said anterior meniscal component lip being positioned between said tibial tray and said anterior rotation protrusion lip, said posterior rotation protrusion lip facing a posterior opposing lip formed in said posterior cutout of said meniscal component, said posterior meniscal component lip being positioned between said tibial tray and said posterior rotation protrusion lip.

1 more element

A prosthetic knee, comprising:

a femoral component including a condylar bearing surface;
a meniscal component including a cooperative bearing surface facing said condylar bearing surface of said femoral component;
and
a tibial component including an anterior rotation protrusion, and a posterior rotation protrusion positioned in an anterior cutout and a posterior cutout of said meniscal component, respectively, said anterior rotation protrusion including an anterior lip extending substantially parallel to a tibial tray of said tibial component, said posterior rotation protrusion including a posterior lip extending substantially parallel to said tibial tray of said tibial component, said anterior rotation protrusion lip facing an anterior opposing lip formed in said anterior cutout of said meniscal component, said anterior meniscal component lip being positioned between said tibial tray and said anterior rotation protrusion lip, said posterior rotation protrusion lip facing a posterior opposing lip formed in said posterior cutout of said meniscal component, said posterior meniscal component lip being positioned between said tibial tray and said posterior rotation protrusion lip, said anterior rotation protrusion moveable within said anterior cutout of said meniscal component, said posterior rotation protrusion moveable within said posterior cutout of said meniscal component.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 10/001,000Filed 2 Nov 2001 · continuation in part
Priority: 29 Jan 2001
Published: US 2002/0103541 A18 Aug 2002
Granted: 13 Apr 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

A61F 2/3868
For elbows or knees: with sliding tibial bearing
A61F 2/385
Hinged, i.e. with transverse axle restricting the movement: also provided with condylar bearing surfaces
A61F
Filters implantable into blood vessels

Family

Application09/771,061Parent of this continuation-in-part · filed 29 Jan 2001
US 2002/0107576 A1Pre-grant publication · published 8 Aug 2002
US 6,485,519 B2Parent of this continuation-in-part
US 2002/0103541 A1Published application
US 6,719,800 B2This patent

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

Timeline

Citations

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