Acetabular prosthesis
AssigneeLimacorporate S.P.A.
InventorsPaolo Dalla Pria, Luca Giorgini, Michele Pressacco
Life of this patent
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Abstract
Acetabular prosthesis comprising an acetabular cup, an acetabular insert, able to be stably coupled inside the acetabular cup and configured to receive an articulation head and a centering unit configured to guide and center the insertion and stable positioning of the acetabular insert in the acetabular cup. The centering unit comprises a centering hole provided in the acetabular cup and a centering pin provided on the acetabular insert and which develops along a centering axis, configured to be inserted in the centering hole. The centering pin is provided with an external lateral surface that has an undulating development along the centering axis.
Claims11
Acetabular prosthesis comprising:
- an acetabular cup;
- an acetabular insert, configured to be stably coupled inside the acetabular cup and to receive an articulation head;
- a centering unit configured to guide and center the insertion and stable positioning of the acetabular insert in the acetabular cup, said centering unit comprising a centering hole provided in the acetabular cup, the centering hole having a minimum radius R, and a centering pin provided on the acetabular insert and which develops along a centering axis, configured to be inserted in the centering hole,
- wherein the centering pin is provided with an external lateral surface that has an undulating profile along the centering axis,
- wherein the undulating profile is continuous and includes a concave part and a convex part connected by a connection inflection,
- wherein the centering pin has a maximum radius R1 coinciding with the convex part, with the maximum radius R1 being less than the minimum radius R, and
- wherein at least a portion of the convex part is disposed above the maximum radius R1 adjacent a top surface of the centering pin and defines a contact surface arranged to guide and center the centering pin upon first inserting the centering pin into the centering hole.
Acetabular prosthesis comprising:
- an acetabular cup;
- an acetabular insert configured to be coupled inside the acetabular cup and to receive an articulation head;
- a centering unit configured to guide and center the insertion and positioning of the acetabular insert in the acetabular cup, the centering unit comprising a centering hole provided in the acetabular cup, the centering hole having an exclusively straight and linear lateral sidewall, and a centering pin provided on the acetabular insert and which develops along a centering axis, the centering pin configured to be inserted in the centering hole;
- the centering pin including an external lateral surface having a continuously curved undulating profile along the centering axis, the undulating profile including a concave part and a convex part, the concave part and the convex part directly connected by a connection inflection without an intervening straight section between the concave part and the convex part;
- the centering pin having a maximum radius R1, the maximum radius R1 coinciding with the convex part, the maximum radius R1 of the centering pin sized to form a size difference clearance with respect to the straight lateral sidewall of the centering hole;
- and
- wherein at least a portion of the convex part is disposed above the maximum radius R1 adjacent a top surface of the centering pin and defines a curved contact surface arranged to guide and center the centering pin upon first inserting the centering pin into the centering hole.
Dependencies are inferred from the claim text.