Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1988-08-11
1989-09-12
Apley, Richard J.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
A61F 238
Patent
active
048656062
ABSTRACT:
An endoprosthesis for a knee joint comprising a femur part (6), a tibia part (8), and a middle part (18) which is articulated on the femur part (6) by a pin (14). The middle part (18) is pivotable with respect to the tibia part (8) about a centering pin (20), and a stop is pivoted which is dependent on the flexion angle. A bearing part (54), acting as artificial meniscus, is arranged between the femur part (6) and the middle part (18), and has a first guide element (56) coaxial to the flexion axis and in engagement with the bearing member (58) of the femur part (6). The bearing part (54) is displaceable with respect to the middle part (18) and also comprises a second guide element (60) in engagement with a guide track (62) of the middle part (18); the pin (14) is arranged eccentric to the bearing member (58), and movement of the flexion axis is forced along an evolute curve. The invention avoids localized load peaks while accomplishing the physiological functions of the knee joint during movement and load.
REFERENCES:
patent: 4085466 (1978-04-01), Goodfellow et al.
patent: 4112522 (1978-09-01), Dadurian et al.
patent: 4216549 (1978-04-01), Hillberry et al.
patent: 4262368 (1981-04-01), Lacey
patent: 4462120 (1984-07-01), Rambert
patent: 4790853 (1988-12-01), Eugelbrecht
Maquet, Biomechanics of the Knee, Springer-Verlag, Berlin, Heidelberg, New York, (1976), pp. 32-39.
Apley Richard J.
Friedrichsfeld GmbH Keramik und Kunststoffwerke
Prizant James
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