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US 10,092,406 B2Granted
Acetabular prosthesis and corresponding method for production and assembly
AssigneeLimacorporate S.P.A.
InventorMichele Pressacco
Life of this patent
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Abstract
Acetabular prosthesis comprising an acetabular cup, defining a coupling cavity, and an insert, able to be inserted inside the coupling cavity. The acetabular cup and the insert have a common coupling axis and comprise respective clamping means for their reciprocal clamping in an assembled condition.
Claims20
Acetabular prosthesis comprising:
- an acetabular cup comprising an internal surface defining a coupling cavity and having a largest internal diameter,
- an insert able to be inserted inside said coupling cavity and comprising an external surface having a largest external diameter measured when in a disassembled condition,
- said acetabular cup and said insert having a common coupling axis and comprising respective clamping means for their reciprocal clamping in an assembled condition, wherein in the disassembled condition the largest internal diameter of the acetabular cup is less than the largest external diameter of said insert, and when in the assembled condition with the largest external diameter of the insert disposed within the acetabular cup the largest external diameter of said insert is equal to the largest internal diameter of the acetabular cup, wherein the internal diameter of the acetabular cup is considered in correspondence to a coupling plane between the acetabular cup and the insert defined along said coupling axis, wherein furthermore said clamping means comprise:
- a first clamping surface made on said internal surface of said acetabular cup,
- a second clamping surface made on said external surface of said insert, and cooperating with said first clamping surface,
- wherein said second clamping surface includes the largest external diameter of said insert,
- said first clamping surface and said second clamping surface having a truncated cone shape with an inclination different from each other with respect to said coupling axis, so as to obtain a conical coupling between said insert and said acetabular cup, with continuous but variable interference relative to said coupling axis;
- and
- wherein the largest external diameter of the insert is coincident with a maximum interference between the insert and the acetabular cup.
6 more elements
Acetabular prosthesis comprising:
- an acetabular cup comprising an internal surface defining a coupling cavity, the coupling cavity of the acetabular cup having a largest internal diameter;
- an insert sized for insertion inside the coupling cavity and comprising an external surface and having a largest external diameter measured when in a disassembled condition;
- the acetabular cup and the insert arranged for clamping to one another in an assembled condition and along a common coupling axis;
- the insert and the acetabular cup arranged so that, in the disassembled condition, the largest internal diameter of the coupling cavity of the acetabular cup is less than the largest external diameter of the insert;
- the insert and the acetabular cup further arranged so that, in the assembled condition, the largest external diameter of the insert is equal to the largest internal diameter of the coupling cavity of the acetabular cup, the largest external diameter of the insert and the largest internal diameter of the acetabular cup are in proximity to a coupling plane between the acetabular cup and the insert defined along said coupling axis, with the largest external diameter of the insert disposed within the acetabular cup;
- wherein the internal surface of the coupling cavity of the acetabular cup includes a first clamping surface having a truncated conical shape having a first inclination;
- wherein the external surface of the insert includes a second clamping surface having a truncated conical shape having a second inclination larger than the first inclination;
- the first clamping surface cooperating with the second clamping surface when in the assembled condition so as to obtain an exclusively conical coupling between the insert and the acetabular cup, the conical coupling having a variable interference relative to the coupling axis;
- and
- wherein the acetabular cup includes an external surface having an equatorial band shaped to comprise an external ring, and wherein all of the external ring is disposed above the coupling plane when in the assembled condition, and
- wherein the largest external diameter of the insert is in direct contact with the largest internal diameter of the acetabular cup at a point of maximum interference adjacent the coupling plane, and a point of minimum interference is disposed above the external ring.
8 more elements
Dependencies are inferred from the claim text.