Universal prosthetic head for hip prosthesis
OwnerAlessandro MELOZZIinventor
Life of this patent
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Abstract
A prosthetic head with a body having the shape of a cup shaped as a hemispherical cap provided with an external surface, an internal surface and a lower edge shaped as a circumference, fixing means to fix the prosthetic head to the cotyle, and a projection abutting from the internal surface of the prosthetic head in such manner to define an annular step, and a truncated-conical portion obtained in the internal surface of the body of the prosthetic head starting from the lower edge of the prosthetic head, the truncated-conical portion of the prosthetic head being suitable for being coupled in conical coupling mode with a truncated conical part of an insert intended to be inserted in the prosthetic head. he projection is shaped as a portion of a spherical cap.
Claims15
Prosthetic head for hip prosthesis, said prosthetic head being intended to be fixed to a cotyle, said prosthetic head comprising:
- a body having the shape of a cup shaped as a hemispherical cap and provided with an external surface, an internal surface and a lower edge shaped as a circumference;
- fixing means to fix the prosthetic head to the cotyle, and
- a projection abutting from the internal surface of the prosthetic head in such manner to define an annular step, a truncated-conical portion obtained in the internal surface of the body of the prosthetic head starting from said lower edge of the prosthetic head, said truncated-conical portion of the prosthetic head being suitable for being coupled in conical coupling mode with a truncated-conical portion of an insert intended to be inserted in the prosthetic head
- characterized in that
- said projection is shaped as a portion of a spherical cap.
Inverse hip prosthesis comprising a prosthetic head intended to be fixed to a cotyle;
- said prosthetic head comprising:
- a body having the shape of a cup shaped as a hemispherical cap, provided with an external surface, an internal surface and a lower edge shaped as a circumference;
- fixing means to fix the prosthetic head to the cotyle, and
- a projection abutting from the internal surface of the prosthetic head in such manner to define an annular step;
- said projection having the shape of an annular collar,
- a truncated-conical portion obtained in the internal surface of the body of the prosthetic head starting from said lower edge of the prosthetic head, said truncated-conical portion of the prosthetic head being suitable for being coupled in conical coupling mode with a truncated-conical portion of an insert intended to be inserted in the prosthetic head;
- said inverse hip prosthesis also comprising:
- a ball provided with a projecting portion that cooperates with said projection of the prosthetic head, in such manner to generate an air space between the ball and the prosthetic head and to constrain the movement of the ball with respect to the prosthetic head and;
- a distal cup intended to be fixed to a stem intended to be fixed to a femur;
- said distal cup having a body shaped as a hemispherical cap suitable for receiving said ball in spherical coupling mode and intended to enter said air space between the ball and the prosthetic head.
Dependencies are inferred from the claim text.