Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1986-09-11
1990-07-31
Apley, Richard J.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
623 18, A61F 232
Patent
active
049447629
ABSTRACT:
The invention relates to a femoral hip-joint endoprosthesis having a shaft to be inserted into the medullary cavity (4) of the femur (1) and a support plate (7), which terminates the shaft proximally and the under surface (12) of which is provided for support on the resection surface (16) of the bone. The overall axis (6) of the resection surface is inclined. The prerequisites for the transfer of forces from the prosthesis to the bone are improved when the under surface (12) and the resection surface (16), which is prepared to be of the same shape, are formed so that the medial part of the under surface includes an angle with the axis of the femur which is, on average, larger than its lateral part. A cylindrical shape of the two surfaces witha cylindrical axis running from anterior to posterior, or a spherical shape, are particularly advantageous. Furthermore, it is advantageous to form the under surface as a surface of revolution about a rotation axis running transverse to the under surface. This permits very exact preparation of the resection surface with a cutter which is held in a predetermined position by a holding shaft which coincides with the shaft of the prosthesis and which is inserted in the medullary cavity of the bone.
REFERENCES:
patent: 3228393 (1966-01-01), Michele
patent: 3782373 (1974-01-01), Smythe
patent: 3991425 (1976-11-01), Martin et al.
patent: 4276660 (1981-07-01), Laure
Keller Arnold
Link Helmut D.
Apley Richard J.
interplanta Arzt-und Krankenhausbedarf GmbH
Isabella David J.
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