×

Hip joint prosthesis

  • US 5,980,575 A
  • Filed: 08/22/1994
  • Issued: 11/09/1999
  • Est. Priority Date: 02/28/1992
  • Status: Expired due to Fees
First Claim
Patent Images

1. A fixture for a hip joint prosthesis which is adapted to be permanently anchored in an operational position in the neck of a human femur after resection of the femur head from the neck by translation of the fixture in a predetermined forward direction into a cylindrical bore having an open end in the femur neck outer surface exposed on resection of the femur neck and an axial extent in the predetermined forward direction from the open end towards the opposite outer surface of the femur below the greater trochanter, the fixture comprising:

  • a forward section which comprises a cylindrical forward portion of a first diameter and a coaxial cylindrical rearward portion of a second diameter greater than the first diameter and which after translation of the fixture to the operational position of the fixture is disposed in the cylindrical bore; and

    a rearward section connected to the cylindrical rearward portion of the forward section which is adapted in use to carry a prosthetic ball unit of the hip joint prosthesis and which after translation of the fixture to the operational position of the fixture is disposed outside of the bore in the femur neck,wherein the forward section is integrally formed such that the cylindrical forward and rearward portions of the forward section are rotatable and translate in unison when the forward section is translated to the operational position, and said portions are provided with external screw threads; and

    wherein the first and second diameters and external screw threads of the cylindrical forward and rearward portions of the forward section are adapted such that the fixture is able to be translated to the operational position by screwing of the fixture into the cylindrical bore about the predetermined forward direction with the external screw threads of the cylindrical forward and rearward portions simultaneously turning in the bone tissue forming the boundary wall of the cylindrical bore.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×