Acetabular components with radiological markers for a hip replacement implant

• US 9,474,614 B2
• Filed: 08/06/2014
• Issued: 10/25/2016
• Est. Priority Date: 08/08/2013
• Status: Active Grant

• Current Assignee: Duke University
• Original Assignee: Scott Kelley
• Inventors: Kelley, Scott
• Primary Examiner(s): STEWART, ALVIN J
• Application Number:
  US14/453,383
• Publication Number:
  US 20150045905A1
• Time in Patent Office: 811 Days
• Field of Search: 623 2215- 2238
• US Class Current: 1/1
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/302 toroidal, e.g. rings

Abstract

An acetabular component of a hip replacement implant that is configured to be attached to an acetabulum and to receive a femoral component of the hip replacement implant. The component includes a concave body with a closed end configured to seat against the acetabulum and an open end configured to receive the femoral component. At least one radiological marker is positioned on the body and is visibly distinct from the body on X-ray imaging. The radiological markers may include an elongated shape with a length measured between a first end and a second end. The radiological markers may be shorter than the body such that they do not extend completely around the body and the first and second ends are spaced apart from one another.

Claims

1. An acetabular component of a hip replacement implant configured to be attached to an acetabulum and to receive a femoral component of the hip replacement implant, the acetabular component comprising:

a concave body with a closed end configured to seat against the acetabulum and an open end configured to receive the femoral component, the body further comprising inner and outer sides, and a circular rim that extends around the open end;

at least one radiological marker on the body and being constructed from a material that is visibly distinct from the body on X-ray imaging, each of the radiological markers comprising an elongated shape with a length measured between a first end and a second end;

each of the radiological markers being positioned at the rim of the open end of the body where the length of the radiological marker is less than a circumference of the body with the first and second ends of the radiological marker being spaced apart.

2. The acetabular component of claim 1, a first one of the radiological markers is positioned along the outer side of the body with an outer edge of the marker positioned an equal distance away from the open end.

3. The acetabular component of claim 1, a first one of the radiological markers extends along just the rim of the body and is spaced away from the inner and outer sides of the body.

4. The acetabular component of claim 1, wherein a first one of the radiological markers extends around at least one-half of the circumference of the body.

5. The acetabular component of claim 1, wherein a first one of the radiological markers extends around at least a portion of the rim and the outer side of the body and is spaced away from the inner side of the body.

6. The acetabular component of claim 1, wherein none of the radiological markers extend on the rim of the body.

7. The acetabular component of claim 1, further comprising a liner that is positioned along the inner side of the body, the liner including a concave shape.

8. The acetabular component of claim 1, a first one of the radiological markers comprises a first side and a second side with the first side being in closer proximity to the open end than the second side, the first and second sides being parallel over a majority of a length of the radiological marker.

9. The acetabular component of claim 1, wherein first and second ones of the radiological markers are aligned along the same circumferential portion of the body.

10. An acetabular component of a hip replacement implant configured to be attached to an acetabulum and to receive a femoral component of the hip replacement implant, the acetabular component comprising:

a concave body with a closed end configured to seat against the acetabulum and an open end configured to receive the femoral component, the body further comprising a body radius, an inner side, an outer side, and a rim that extends around the open end and includes a circular shape in a plane perpendicular to a central axis of the body;

at least one radiological marker positioned at the open end and being constructed from a material that is visibly distinct from the body on X-ray imaging when the acetabular component is viewed with x-ray imaging;

a first one of the radiological markers comprising an elongated curved shape that corresponds with the body radius with opposing first and second parallel sides and opposing first and second ends that are spaced apart.

11. The acetabular component of claim 10, wherein the first one of the radiological markers does not extend completely around a circumference of the body.

12. The acetabular component of claim 10, wherein the first one of the radiological markers is positioned along just the rim of the body and is spaced away from the inner and outer sides.

13. The acetabular component of claim 10, wherein the first one of the radiological markers is positioned along the outer side of the body at the rim.

14. The acetabular component of claim 10, wherein a second one of the radiological markers is positioned on the body and is spaced away from the first one of the radiological markers.

15. The acetabular component of claim 14, wherein the second one of the radiological markers is positioned on one of the rim and the outer side of the body and the first one of the radiological markers is positioned on the other of the rim and the outer side of the body.

16. The acetabular component of claim 10, wherein the body comprises a hemispherical shape.

17. An acetabular component of a hip replacement implant configured to be attached to an acetabulum and to receive a femoral component of the hip replacement implant, the acetabular component comprising:

a concave body with a closed end configured to seat against the acetabulum and an open end configured to receive the femoral component, the body further comprising inner and outer sides, and a circular rim that extends around the open end, the body including a central axis that extends through the closed end and the open end;

at least one radiological marker on the rim and being constructed from a material that is visibly distinct from the body on X-ray imaging when the acetabular component is viewed with x-ray imaging, each of the radiological markers comprising an elongated shape with a length measured between a first end and a second end with the first and second ends being spaced apart along the rim.

18. The acetabular component of claim 17, wherein a second one of the radiological markers is positioned along the body away from the rim with the length being smaller than the body with the first and second ends being spaced apart on the body in a first plane that is normal to the central axis.

19. The acetabular component of claim 18, wherein the rim is positioned in a second plane that is normal to the axis, the second plane being spaced apart along the central axis from the first plane.