Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1996-11-08
1998-03-10
Isabella, David
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
623 18, 606 67, A61F 228
Patent
active
057255970
ABSTRACT:
An artificial hip-joint having a construction capable of reducing abrasion of a polyethylene layer formed within the acetabulum cup when the head of the femur pivots in the acetabulum cup. The artificial acetabulum cup is implanted in the acetabulum of a user's pelvic bone and includes a hollow hemispherical member made of a metal. The polyethylene layer is formed on the inner surface of the hemispherical member. A femur head holder is fixed to the femur. The femur head holder includes a spherical metal femur head pivotally held in the artificial acetabulum cup, a shaft coupled at an upper end thereof to the femur head and adapted to support the femur head, a housing extending inclinedly through the greater trochanter of the femur and adapted to receive the shaft therein in such a manner that it rotates with respect to the shaft, and bearings mounted between the shaft and the housing and adapted to support axial and radial load applied to the shaft at the femur head by the weight of the user. The bearings allows the housing to rotate with respect to the shaft when the user performs a movement involving a rotation of the femur head in the acetabulum cup, so that the movement of the user can be conducted while preventing the rotation of the femur head in the acetabulum cup.
REFERENCES:
patent: 2612159 (1952-09-01), Collison
patent: 4129903 (1978-12-01), Huggler
patent: 5376125 (1994-12-01), Volnkler
patent: 5389107 (1995-02-01), Nassar et al.
A.H. Crenshaw; pp. 442-473, vol. 1-8, Campbell's Operative Orthopaedics.
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