Patent ID: 9700418
Date: 2017-07-11
CPC Classifications: A61F

Claim:
1. Hip prosthesis comprising: a stem intended to be inserted in a neck of a femur, a prosthetic head shaped as a substantially hemispherical cup, intended to be inserted in an acetabular seat, said prosthetic head comprising through holes to receive fixing screws intended to be fixed to said acetabular seat, a distal prosthetic component connected to the stem and shaped as a substantially hemispherical cup with concavity towards a concavity of said prosthetic head, said distal prosthetic component having a border, a ball disposed between said distal prosthetic component and said prosthetic head in such manner to generate a ball coupling, said prosthetic head comprising: a flattened pole defining an external central flat planar surface in order to adjust to various shapes of acetabular seat, and a central portion with a higher thickness than a peripheral portion of the prosthetic head, in such manner to generate a step inside the prosthetic head, said central portion of the head prosthetic head being engaged on the external surface of the ball in such manner to generate an empty space between the external surface of the ball and the internal surface of the peripheral portion of the prosthetic head, so that the border of said distal component is capable of introducing into said empty space, and grooves obtained on the external surface of said prosthetic head to allow for anchoring the prosthetic head to the acetabular seat in order to obtain a primary stability of the prosthetic head, wherein said through holes are exclusively obtained in said central portion of the prosthetic head and said grooves are exclusively obtained in said peripheral portion of the prosthetic head.