Endoprosthesis shaft

Details Endoprosthesis shaft Endoprosthesis shaft

1984-01-13

1985-08-20

Apley, Richard J.

Prosthesis (i.e., artificial body members), parts thereof, or ai

Implantable prosthesis

Bone

128 92C, 128 92CA, 623 18, A61F 100

Patent

active

045354871

ABSTRACT:
The load P on an artificial hip joint produces a bending moment on the endoprosthesis shaft composed of a shaft proper (1), a collar (2) fitting the resection plane and a cone (3) for carrying the femur ball (14). The extra load B thereby provided on the medial side of the femur is relieved by providing means for resisting the tension force A of the bending moment by providing the shaft with cavities (11) separated by ribs (12) as well as by a median longitudinal rib (broken lines).The bone grows into the cavities thus securing the area against the tension effects. Additional cavities (9) and wedge-shaped nubs (7) and (5) similarly oppose forces A and/or B. Hollows (10) on the underside of the collar (2), as well as the cavities (11) and (9), also oppose twisting forces.

REFERENCES:
patent: 4068324 (1978-01-01), Townley et al.
patent: 4356571 (1982-11-01), Esper et al.

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