Robotic acetabulum preparation for acceptance of acetabular cup with engagement features

Patent metadata

Field	Value
Publication number	US-12059354-B2
Application number	US-202016788702-A
Country	US
Kind code	B2
Filing date	Feb 12, 2020
Priority date	Feb 15, 2019
Publication date	Aug 13, 2024
Grant date	Aug 13, 2024

Abstract

In one embodiment, the present disclosure relates to an acetabular cup for implantation into a prepared acetabulum. The acetabular cup includes an inner surface, an outer surface, and an end face that separates the inner surface and the outer surface. The end face is opposite a polar region of the acetabular cup and circumscribes an open end of the acetabular cup. A plurality of protrusions project outwardly from the outer surface at predefined locations. The acetabular cup is operatively engaged to the prepared acetabulum in a planned orientation when the plurality of protrusions are received in corresponding predefined recesses in the prepared acetabulum.

First claim

The invention claimed is:

1. An acetabular cup for implantation into a prepared acetabulum comprising:
an inner surface;
an outer surface with a plurality of protrusions projecting outwardly therefrom in predefined locations, wherein the plurality of protrusions are formed monolithically with the outer surface; and
an end face separating the inner surface and the outer surface, the end face opposite a polar region of the acetabular cup and circumscribing an open end of the acetabular cup,
wherein a maximum length dimension of a first protrusion of the plurality of protrusions is measured along the outer surface and a maximum depth dimension of the first protrusion is measured in a direction perpendicular to the outer surface, a circumferential component of the maximum length dimension parallel to an edge separating the outer surface from the end face being greater than the maximum depth dimension,
wherein the maximum length dimension of the first protrusion extends from a first end portion to a second end portion opposite the first end portion, at least one of the first end portion and the second end portion having a convex surface, the convex surface being convex along the maximum length dimension and in a direction transverse to the maximum length dimension,
wherein a central axis passes through an apex of the acetabular cup and a center of a cup opening defined by an inner perimeter of the end face,
wherein the maximum length dimension of the first protrusion is oriented at an acute angle relative to a first plane perpendicular to the central axis, the maximum length dimension being longer than any other dimension of the first protrusion, and
wherein the acetabular cup is configured to operatively engage to the prepared acetabulum in a planned orientation when the plurality of protrusions are received in corresponding predefined recesses in the prepared acetabulum.

2. The acetabular cup of claim 1 , wherein the plurality of protrusions are configured to be received in corresponding predefined recesses having a volume substantially the same as a volume of the plurality of protrusions.

3. The acetabular cup of claim 1 , wherein the plurality of protrusions are configured to be received in corresponding predefined recesses having an initial volume less than a volume of the plurality of protrusions.

4. The acetabular cup of claim 1 , wherein the plurality of protrusions are configured to snap-fit into the corresponding predefined recesses.

5. The acetabular cup of claim 1 , wherein upon rotation of the plurality of protrusions about a polar axis of the acetabular cup, the plurality of protrusions are configured to rotate into engagement with the corresponding predefined recesses.

6. The acetabular cup of claim 1 , wherein each protrusion of the plurality of protrusions has a long dimension that is oriented at an acute angle relative to an axis passing through a center of the polar region of the acetabular cup and a center of the open end of the acetabular cup, an end of the long dimension being tapered.

7. The acetabular cup of claim 1 , wherein the end face is non-planar.

8. An acetabular cup comprising:
an inner surface;
an outer surface with a plurality of protrusions thereon, each protrusion of the plurality of protrusions having a long dimension with a tapered end that includes a convex surface that is convex along the long dimension and in a direction transverse to the long dimension, the long dimension of a first protrusion of the plurality of protrusions being a maximum dimension of the first protrusion and oriented at an acute angle relative to a first plane, the first plane being perpendicular to a central axis of the acetabular cup that passes through an apex of the acetabular cup in a polar region of the acetabular cup and a center of an open end of the acetabular cup; and
an end face separating the inner surface and the outer surface, the end face opposite the polar region of the acetabular cup and circumscribing the open end of the acetabular cup,
wherein the plurality of protrusions are sized to slidably engage with complementary surfaces in a prepared acetabulum such that when the acetabular cup is rotated into the prepared acetabulum, the plurality of protrusions slide into the complementary surfaces in the prepared acetabulum.

9. The acetabular cup of claim 8 , wherein the taper of each protrusion of the plurality of protrusions is at a leading end of the long dimension, the leading end located further from the end face than other locations on the protrusion.

10. The acetabular cup of claim 8 , wherein each protrusion of the plurality of protrusions includes a combination of flat and convex surfaces.

11. The acetabular cup of claim 8 , wherein the plurality of protrusions include a second protrusion and a third protrusion, and each of the first, second and third protrusions is located at a first distance from the end face and equally spaced around a perimeter of the outer surface at the first distance.

12. The acetabular cup of claim 8 , wherein the long dimension of each protrusion of the plurality of protrusions extends between a leading end and a trailing end, the leading end and the trailing end both being defined by a rounded taper.

13. The acetabular cup of claim 8 , wherein the tapered end of the long dimension of each protrusion of the plurality of protrusions is a leading end and the long dimension extends between the leading end and a trailing end, a width of the protrusion tapering continuously from the trailing end to the leading end.

Assignees

• Howmedica Osteonics Corp

Inventors

• Mistry Amit

Classifications

• A61F2002/3412

  with pins or protrusions, e.g. non-sharp pins or protrusions projecting from a shell surface · CPC title

• A61F2002/349

  Shell having a wavy or undulated peripheral rim · CPC title

• A61F2002/3417

  the outer shell having protrusions on meridian lines, e.g. equidistant fins or wings around the equatorial zone · CPC title

• A61F2002/3403

  Polar aperture · CPC title

• A61F2002/30891

  Plurality of protrusions · CPC title