Multi-size acetabular impactor

Patent metadata

Field	Value
Publication number	US-12064356-B2
Application number	US-202217891390-A
Country	US
Kind code	B2
Filing date	Aug 19, 2022
Priority date	Aug 19, 2021
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

An acetabular implant kit includes a first acetabular component that has an inner surface that defines a first concave profile. A second acetabular component includes an inner surface that defines a second concave profile. An instrument includes an elongated body that has a first end and a second end. A head is connected to the second end of the body and has an engagement surface. The engagement surface includes a first convex profile and a second convex profile. The first and second convex profiles are arranged along a longitudinal axis of the head and have a first radius of curvature configured to congruently engage the first concave profile of the first acetabular component. The second convex profile has a second radius of curvature configure to congruently engage the second concave profile of the second acetabular component. The first radius of curvature is different than the second radius of curvature.

First claim

The invention claimed is:

1. An acetabular implant kit comprising:
a first acetabular component having an inner surface defining a first concave profile;
a second acetabular component having an inner surface defining a second concave profile; and
an inserter instrument comprising:
an elongated body having a first end and a second end; and
a head connected to the second end of the body and having an engagement surface, the engagement surface having a first convex profile and a second convex profile, the first and second convex profiles being arranged along a longitudinal axis of the head and having a first radius of curvature configured to congruently engage the first concave profile of the first acetabular component, the second convex profile having a second radius of curvature configure to congruently engage the second concave profile of the second acetabular component, the first radius of curvature being different than the second radius of curvature.

2. The acetabular implant kit of claim 1 , further comprising a third acetabular component having an inner surface defining a third concave profile, wherein the engagement surface further includes a third convex profile, the third convex profile having a third radius of curvature configured to congruently engage the inner surface of the third acetabular component and having a third radius of curvature different than the first and second radii of curvature.

3. The acetabular implant kit of claim 2 , wherein the first convex profile intersects the longitudinal axis of the head.

4. The acetabular implant kit of claim 3 , wherein the second and third convex profiles extend about the longitudinal axis of the head.

5. The acetabular implant kit of claim 4 , wherein the second and third convex profiles are ring-shaped and the first convex profile is dome-shaped.

6. The acetabular implant kit of claim 5 , wherein the second convex profile is tangent to the first and third convex profiles.

7. The acetabular implant kit of claim 6 , wherein the second radius of curvature is smaller than the first radius of curvature, and the third radius of curvature is smaller than the second radius of curvature.

8. The acetabular implant kit of claim 1 , wherein the first radius of curvature of the first convex profile is larger than the second radius of curvature of the second convex profile.

9. The acetabular implant kit of claim 1 , wherein the first convex profile is centrally located on the head.

10. The acetabular implant kit of claim 9 , wherein the first and second convex profiles are ring shaped and extend about the longitudinal axis of the head.

11. The acetabular implant kit of claim 1 , wherein the first acetabular component is a first acetabular liner configured to be received within an acetabular shell of a first size, and the second acetabular component is a second acetabular liner configured to be received within a second acetabular shell of a second size smaller than the first size.

12. The acetabular implant kit of claim 1 , wherein, when the first convex profile of the head congruently engages the first concave profile, the second convex profile of the head is configured so that it is free from engagement with the inner surface of the first acetabular component, and when the second convex profile of the head congruently engages the second concave profile, the first convex profile is configures so that it is free from engagement with the inner surface of the second acetabular component.

13. The acetabular implant kit of claim 1 , wherein the first inner surface of the first acetabular component defines a first hemispherical cavity having a first diameter, and the second inner surface of the first acetabular component defines a second hemispherical cavity having a second diameter smaller than the first diameter.

14. The acetabular implant kit of claim 1 , wherein the first and second acetabular components are each an acetabular shell having a porous outer surface configured to promote bone ingrowth.

15. The acetabular implant kit of claim 14 , wherein the first acetabular component is an acetabular shell, and the second acetabular component is an acetabular liner configured to be received within the first hemispherical cavity of the first acetabular component.

16. An acetabular inserter instrument comprising:
an elongated body having first and second ends; and
a head connected to the second end and having a convex outer surface, the convex outer surface having first and second engagement portions extending at least partially about and partially along an axis of the head, the first engagement portion having a first radius of curvature different than a second of curvature of the second engagement portion.

17. The acetabular inserter and impactor instrument of claim 16 , wherein the first radius of curvature is greater than the second radius of curvature.

18. The acetabular inserter and impactor instrument of claim 17 , wherein the first engagement portion is centrally located on the head such that it intersects the axis of the head, and the second engagement portion is tangent to the first engagement portion.

19. The acetabular inserter and impactor instrument of claim 18 , wherein the head is detachably coupled to the first end of the elongated body.

20. A method for implanting a prosthetic acetabular implant comprising:
selecting one of a first acetabular component and a second acetabular component from a plurality of acetabular components, the first acetabular component being of a different size than the second acetabular component;
when the first acetabular component is selected, engaging a first concave profile of an inner surface of the first acetabular component with a first convex profile of a head of an inserter instrument;
when the second acetabular component is selected, engaging a second concave profile of an inner surface of the second acetabular component with a second convex profile of the head so that the first convex profile of the head is free from engagement with the second acetabular component; and
inserting the selected acetabular component into a prepared acetabulum of a mammalian subject using the inserter instrument.

Assignees

• Howmedica Osteonics Corp

Inventors

• Roy Shammodip
• Abdel Matthew P

Classifications

• A61F2002/3483

  having a convex shape, e.g. hemispherical heads · CPC title

• A61F2002/3448

  Multiple cups made of three or more concentric shells fitted or nested into one another · CPC title

• A61F2002/4681

  by applying mechanical shocks, e.g. by hammering · CPC title

• A61F2002/3093

  for promoting ingrowth of bone tissue · CPC title

• A61F2002/30784

  Plurality of holes · CPC title