Robotic acetabulum preparation for acceptance of acetabular cup with engagement features
AssigneeHowmedica Osteonics Corp.
InventorAmit Mistry
Life of this patent
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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.
Claims13
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.
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.
Dependencies are inferred from the claim text.